jsampler/task/Channel.java

/*
 *   JSampler - a java front-end for LinuxSampler
 *
 *   Copyright (C) 2005-2007 Grigor Iliev <grigor@grigoriliev.com>
 *
 *   This file is part of JSampler.
 *
 *   JSampler is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License version 2
 *   as published by the Free Software Foundation.
 *
 *   JSampler is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with JSampler; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *   MA  02111-1307  USA
 */

package org.jsampler.task;

import java.util.logging.Level;

import net.sf.juife.Task;

import org.jsampler.CC;
import org.jsampler.HF;
import org.jsampler.JSPrefs;
import org.jsampler.SamplerChannelModel;
import org.jsampler.SamplerModel;

import org.linuxsampler.lscp.FxSend;

import static org.jsampler.JSI18n.i18n;
import static org.jsampler.JSPrefs.*;


/**
 * Provides the sampler channel's specific tasks.
 * @author Grigor Iliev
 */
public class Channel {
        
        /** Forbits the instantiation of this class. */
        private Channel() { }
        
        
        /**
         * This task creates a new sampler channel.\
         */
        public static class Add extends EnhancedTask<Integer> {
                /** Creates a new instance of <code>Add</code>. */
                public
                Add() {
                        setTitle("Channel.Add_task");
                        setDescription(i18n.getMessage("Channel.Add.desc"));
                }
        
                /** The entry point of the task. */
                public void
                run() {
                        try {
                                setResult(CC.getClient().addSamplerChannel());
                                
                                JSPrefs p = CC.getViewConfig().preferences();
                                if(!p.getBoolProperty(USE_CHANNEL_DEFAULTS)) return;
                                
                                String s = p.getStringProperty(DEFAULT_ENGINE);
                                if(s != null && s.length() > 0) {
                                        CC.getClient().loadSamplerEngine(s, getResult());
                                }
                                
                                s = p.getStringProperty(DEFAULT_MIDI_INPUT);
                                if(s != null && s.equals("firstDevice")) {
                                        assignFirstMidiDevice();
                                } else if(s != null && s.equals("firstDeviceNextChannel")) {
                                        assignFirstMidiDeviceNextChannel();
                                }
                                
                                s = p.getStringProperty(DEFAULT_AUDIO_OUTPUT);
                                if(s != null && s.equals("firstDevice")) {
                                        assignFirstAudioDevice();
                                }
                        } catch(Exception x) {
                                setErrorMessage(getDescription() + ": " + HF.getErrorMessage(x));
                                CC.getLogger().log(Level.FINE, getErrorMessage(), x);
                        }
                }
                
                private void
                assignFirstMidiDevice() throws Exception {
                        if(CC.getSamplerModel().getMidiDeviceCount() < 1) return;
                        int id = CC.getSamplerModel().getMidiDevices()[0].getDeviceId();
                        CC.getClient().setChannelMidiInputDevice(getResult(), id);
                }
                
                private void
                assignFirstMidiDeviceNextChannel() throws Exception {
                        int channelId = getResult();
                        if(CC.getSamplerModel().getMidiDeviceCount() < 1) return;
                        int id = CC.getSamplerModel().getMidiDevices()[0].getDeviceId();
                        CC.getClient().setChannelMidiInputDevice(channelId, id);
                        
                        boolean[] usedChannels = new boolean[16];
                        for(int i = 0; i < usedChannels.length; i++) usedChannels[i] = false;
                        
                        for(SamplerChannelModel m : CC.getSamplerModel().getChannels()) {
                                if(m.getChannelId() == channelId) continue;
                                if(m.getChannelInfo().getMidiInputDevice() != id) continue;
                                if(m.getChannelInfo().getMidiInputPort() != 0) continue;
                                int chn = m.getChannelInfo().getMidiInputChannel();
                                if(chn >= 0 && chn < 16) usedChannels[chn] = true;
                        }
                        
                        int lastUsed = -1;
                        for(int i = 0; i < usedChannels.length; i++) {
                                if(usedChannels[i]) lastUsed = i;
                        }
                        
                        if(lastUsed == -1) {
                                CC.getClient().setChannelMidiInputChannel(channelId, 0);
                                return;
                        }
                        
                        if(lastUsed < 15) {
                                CC.getClient().setChannelMidiInputChannel(channelId, lastUsed + 1);
                                return;
                        }
                        
                        int firstUnused = -1;
                        for(int i = 0; i < usedChannels.length; i++) {
                                if(!usedChannels[i]) {
                                        firstUnused = i;
                                        break;
                                }
                        }
                        
                        if(firstUnused == -1) {
                                CC.getClient().setChannelMidiInputChannel(channelId, 0);
                                return;
                        }
                        
                        CC.getClient().setChannelMidiInputChannel(channelId, firstUnused);
                }
                
                private void
                assignFirstAudioDevice() throws Exception {
                        if(CC.getSamplerModel().getAudioDeviceCount() < 1) return;
                        int id = CC.getSamplerModel().getAudioDevices()[0].getDeviceId();
                        CC.getClient().setChannelAudioOutputDevice(getResult(), id);
                }
        }

        /**
         * This task removes the specified sampler channel.
         */
        public static class Remove extends EnhancedTask {
                private int channel;
        
                /**
                 * Creates new instance of <code>Remove</code>.
                 * @param channel The numerical ID of the channel to remove.
                 */
                public
                Remove(int channel) {
                        setTitle("Channel.Remove_task");
                        setDescription(i18n.getMessage("Channel.Remove.desc", channel));
                
                        this.channel = channel;
                }
        
                /** The entry point of the task. */
                public void
                run() {
                        try { CC.getClient().removeSamplerChannel(channel); }
                        catch(Exception x) {
                                setErrorMessage(getDescription() + ": " + HF.getErrorMessage(x));
                                CC.getLogger().log(Level.FINE, getErrorMessage(), x);
                        }
                }
        }

        /**
         * This task resets the specified sampler channel.
         */
        public static class Reset extends EnhancedTask {
                private int channel;
        
                /**
                 * Creates new instance of <code>Reset</code>.
                 * @param channel The numerical ID of the channel to reset.
                 */
                public
                Reset(int channel) {
                        setTitle("Channel.Reset_task");
                        setDescription(i18n.getMessage("Channel.Reset.desc", channel));
                
                        this.channel = channel;
                }
        
                /** The entry point of the task. */
                public void
                run() {
                        try { CC.getClient().resetChannel(channel); }
                        catch(Exception x) {
                                setErrorMessage(getDescription() + ": " + HF.getErrorMessage(x));
                                CC.getLogger().log(Level.FINE, getErrorMessage(), x);
                        }
                }
        }

        /**
         * This task sets an audio output channel of a specific sampler channel.
         */
        public static class SetAudioOutputChannel extends EnhancedTask {
                private int chn;
                private int audioOut;
                private int audioIn;
        
                /**
                 * Creates new instance of <code>SetAudioOutputChannel</code>.
                 * @param channel The sampler channel number.
                 * @param audioOut The sampler channel's audio output
                 * channel which should be rerouted.
                 * @param audioIn The audio channel of the selected audio output device where
                 * <code>audioOut</code> should be routed to.
                 */
                public
                SetAudioOutputChannel(int channel, int audioOut, int audioIn) {
                        setTitle("Channel.SetAudioOutputChannel_task");
                        String s = i18n.getMessage("Channel.SetAudioOutputChannel.desc", channel);
                        setDescription(s);
                        
                        this.chn = channel;
                        this.audioOut = audioOut;
                        this.audioIn = audioIn;
                }
        
                /** The entry point of the task. */
                public void
                run() {
                        try { CC.getClient().setChannelAudioOutputChannel(chn, audioOut, audioIn); }
                        catch(Exception x) {
                                setErrorMessage(getDescription() + ": " + HF.getErrorMessage(x));
                                CC.getLogger().log(Level.FINE, getErrorMessage(), x);
                        }
                }
        }

        /**
         * This task sets the audio output device of a specific sampler channel.
         */
        public static class SetAudioOutputDevice extends EnhancedTask {
                private int channel;
                private int deviceID;
        
                /**
                 * Creates new instance of <code>SetAudioOutputDevice</code>.
                 * @param channel The sampler channel number.
                 * @param deviceID The numerical ID of the audio output device.
                 */
                public
                SetAudioOutputDevice(int channel, int deviceID) {
                        setTitle("Channel.SetAudioOutputDevice_task");
                        String s = i18n.getMessage("Channel.SetAudioOutputDevice.desc", channel);
                        setDescription(s);
                
                        this.channel = channel;
                        this.deviceID = deviceID;
                }
        
                /** The entry point of the task. */
                public void
                run() {
                        try { CC.getClient().setChannelAudioOutputDevice(channel, deviceID); }
                        catch(Exception x) {
                                setErrorMessage(getDescription() + ": " + HF.getErrorMessage(x));
                                CC.getLogger().log(Level.FINE, getErrorMessage(), x);
                        }
                }
        }
        
        /**
         * This task sets the MIDI input channel the specified sampler channel should listen to.
         */
        public static class SetMidiInputChannel extends EnhancedTask {
                private int channel;
                private int midiChannel;
        
                /**
                 * Creates new instance of <code>SetMidiInputChannel</code>.
                 * @param channel The sampler channel number.
                 * @param midiChannel The number of the new MIDI input channel where
                 * <code>channel</code> should listen to or -1 to listen on all 16 MIDI channels.
                 */
                public
                SetMidiInputChannel(int channel, int midiChannel) {
                        setTitle("Channel.SetMidiInputChannel_task");
                        String s = i18n.getMessage("Channel.SetMidiInputChannel.desc", channel);
                        setDescription(s);
                        
                        this.channel = channel;
                        this.midiChannel = midiChannel;
                }
        
                /** The entry point of the task. */
                public void
                run() {
                        try { CC.getClient().setChannelMidiInputChannel(channel, midiChannel); }
                        catch(Exception x) {
                                setErrorMessage(getDescription() + ": " + HF.getErrorMessage(x));
                                CC.getLogger().log(Level.FINE, getErrorMessage(), x);
                        }
                }
        }

        /**
         * This task sets the MIDI input device on a specific sampler channel.
         */
        public static class SetMidiInputDevice extends EnhancedTask {
                private int channel;
                private int deviceID;
        
                /**
                 * Creates new instance of <code>SetMidiInputDevice</code>.
                 * @param channel The sampler channel number.
                 * @param deviceID The numerical ID of the MIDI input device.
                 */
                public
                SetMidiInputDevice(int channel, int deviceID) {
                        setTitle("Channel.SetMidiInputDevice_task");
                        String s = i18n.getMessage("Channel.SetMidiInputDevice.desc", channel);
                        setDescription(s);
                        
                        this.channel = channel;
                        this.deviceID = deviceID;
                }
        
                /** The entry point of the task. */
                public void
                run() {
                        try { CC.getClient().setChannelMidiInputDevice(channel, deviceID); }
                        catch(Exception x) {
                                setErrorMessage(getDescription() + ": " + HF.getErrorMessage(x));
                                CC.getLogger().log(Level.FINE, getErrorMessage(), x);
                        }
                }
        }

        /**
         * This task sets the MIDI input port of a specific sampler channel.
         */
        public static class SetMidiInputPort extends EnhancedTask {
                private int channel;
                private int port;
        
                /**
                 * Creates new instance of <code>SetMidiInputPort</code>.
                 * @param channel The sampler channel number.
                 * @param port The MIDI input port number
                 * of the MIDI input device connected to the specified sampler channel.
                 */
                public
                SetMidiInputPort(int channel, int port) {
                        setTitle("Channel.SetMidiInputPort_task");
                        setDescription(i18n.getMessage("Channel.SetMidiInputPort.desc", channel));
                        
                        this.channel = channel;
                        this.port = port;
                }
        
                /** The entry point of the task. */
                public void
                run() {
                        try { CC.getClient().setChannelMidiInputPort(channel, port); }
                        catch(Exception x) {
                                setErrorMessage(getDescription() + ": " + HF.getErrorMessage(x));
                                CC.getLogger().log(Level.FINE, getErrorMessage(), x);
                        }
                }
        }
        
        /**
         * This task loads a sampler engine in a specific sampler channel.
         * @author Grigor Iliev
         */
        public static class LoadEngine extends EnhancedTask {
                private String engine;
                private int channel;
                
                /**
                 * Creates new instance of <code>LoadEngine</code>.
                 * @param engine The name of the engine to load.
                 * @param channel The number of the sampler channel
                 * the deployed engine should be assigned to.
                 */
                public
                LoadEngine(String engine, int channel) {
                        this.engine = engine;
                        this.channel = channel;
                        
                        setTitle("Channel.LoadEngine_task");
                        
                        Object[] objs = { engine, new Integer(channel) };
                        setDescription(i18n.getMessage("Channel.LoadEngine.desc", objs));
                }
                
                /** The entry point of the task. */
                public void
                run() {
                        try { CC.getClient().loadSamplerEngine(engine, channel); }
                        catch(Exception x) {
                                setErrorMessage(getDescription() + ": " + HF.getErrorMessage(x));
                                CC.getLogger().log(Level.FINE, getErrorMessage(), x);
                        }
                }
        }
        
        /**
         * This task loads and assigns an instrument to a sampler channel.
         * @author Grigor Iliev
         */
        public static class LoadInstrument extends EnhancedTask {
                private String filename;
                private int instrIndex;
                private int channel;
                
                /**
                 * Creates new instance of <code>LoadInstrument</code>.
                 * @param filename The name of the instrument file
                 * on the LinuxSampler instance's host system.
                 * @param instrIndex The index of the instrument in the instrument file.
                 * @param channel The number of the sampler channel the
                 * instrument should be assigned to.
                 */
                public
                LoadInstrument(String filename, int instrIndex, int channel) {
                        this.filename = filename;
                        this.instrIndex = instrIndex;
                        this.channel = channel;
                        
                        setTitle("Channel.LoadInstrument_task");
                        setDescription(i18n.getMessage("Channel.LoadInstrument.desc"));
                }
                
                /** The entry point of the task. */
                public void
                run() {
                        try { CC.getClient().loadInstrument(filename, instrIndex, channel, true); }
                        catch(Exception x) {
                                setErrorMessage(getDescription() + ": " + HF.getErrorMessage(x));
                                CC.getLogger().log(Level.FINE, getErrorMessage(), x);
                        }
                }
        }
        
        /**
         * This task assigns the specifed MIDI instrument map to the specified sampler channel.
         */
        public static class SetMidiInstrumentMap extends EnhancedTask {
                private int channel;
                private int mapId;
        
                /**
                 * Creates new instance of <code>SetMidiInstrumentMap</code>.
                 * @param channel The sampler channel number.
                 * @param mapId The numerical ID of the MIDI instrument
                 * map that should be assigned to the specified sampler
                 * channel or <code>-1</code> to remove the current map binding.
                 */
                public
                SetMidiInstrumentMap(int channel, int mapId) {
                        setTitle("Channel.SetMidiInstrumentMap_task");
                        String s = i18n.getMessage("Channel.SetMidiInstrumentMap.desc", channel);
                        setDescription(s);
                        
                        this.channel = channel;
                        this.mapId = mapId;
                }
        
                /** The entry point of the task. */
                public void
                run() {
                        try { CC.getClient().setChannelMidiInstrumentMap(channel, mapId); }
                        catch(Exception x) {
                                setErrorMessage(getDescription() + ": " + HF.getErrorMessage(x));
                                CC.getLogger().log(Level.FINE, getErrorMessage(), x);
                        }
                }
        }
        
        /**
         * This task mutes/unmutes a specific sampler channel.
         */
        public static class SetMute extends EnhancedTask {
                private int channel;
                private boolean mute;
        
                /**
                 * Creates new instance of <code>SetMute</code>.
                 * @param channel The sampler channel to be muted/unmuted.
                 * @param mute If <code>true</code> the specified channel is muted,
                 * else the channel is unmuted.
                 */
                public
                SetMute(int channel, boolean mute) {
                        setTitle("Channel.SetMute_task");
                        setDescription(i18n.getMessage("Channel.SetMute.desc", channel));
                
                        this.channel = channel;
                        this.mute = mute;
                }
        
                /** The entry point of the task. */
                public void
                run() {
                        try { CC.getClient().setChannelMute(channel, mute); }
                        catch(Exception x) {
                                setErrorMessage(getDescription() + ": " + HF.getErrorMessage(x));
                                CC.getLogger().log(Level.FINE, getErrorMessage(), x);
                        }
                }
        }
        
        /**
         * This task solos/unsolos a specific sampler channel.
         */
        public static class SetSolo extends EnhancedTask {
                private int channel;
                private boolean solo;
        
                /**
                 * Creates new instance of <code>SetSolo</code>.
                 * @param channel The sampler channel number.
                 * @param solo Specify <code>true</code> to solo the specified channel,
                 * <code>false</code> otherwise.
                 */
                public
                SetSolo(int channel, boolean solo) {
                        setTitle("Channel.SetSolo_task");
                        setDescription(i18n.getMessage("Channel.SetSolo.desc", channel));
                
                        this.channel = channel;
                        this.solo = solo;
                }
        
                /** The entry point of the task. */
                public void
                run() {
                        try { CC.getClient().setChannelSolo(channel, solo); }
                        catch(Exception x) {
                                setErrorMessage(getDescription() + ": " + HF.getErrorMessage(x));
                                CC.getLogger().log(Level.FINE, getErrorMessage(), x);
                        }
                }
        }

        /**
         * This taks sets the volume of a specific sampler channel.
         */
        public static class SetVolume extends EnhancedTask {
                private int channel;
                private float volume;
        
                /**
                 * Creates new instance of <code>SetVolume</code>.
                 * @param channel The sampler channel number.
                 * @param volume The new volume value.
                 */
                public
                SetVolume(int channel, float volume) {
                        setTitle("Channel.SetVolume_task");
                        setDescription(i18n.getMessage("Channel.SetVolume.desc", channel));
                
                        this.channel = channel;
                        this.volume = volume;
                }
        
                /** The entry point of the task. */
                public void
                run() {
                        /*
                         * Because of the rapid flow of volume change tasks in some cases
                         * we need to do some optimization to decrease the traffic.
                         */
                        boolean b = true;
                        Task[] tS = CC.getTaskQueue().getPendingTasks();
                        
                        for(int i = tS.length - 1; i >= 0; i--) {
                                Task t = tS[i];
                        
                                if(t instanceof SetVolume) {
                                        SetVolume scv = (SetVolume)t;
                                        if(scv.getChannelId() == channel) {
                                                CC.getTaskQueue().removeTask(scv);
                                        }
                                }
                        }
                
                        try { CC.getClient().setChannelVolume(channel, volume); }
                        catch(Exception x) {
                                setErrorMessage(getDescription() + ": " + HF.getErrorMessage(x));
                                CC.getLogger().log(Level.FINE, getErrorMessage(), x);
                        }
                }
        
                /**
                 * Gets the ID of the channel whose volume should be changed.
                 * @return The ID of the channel whose volume should be changed.
                 */
                public int
                getChannelId() { return channel; }
        }

        /**
         * This task updates the settings of a specific sampler channel.
         */
        public static class UpdateInfo extends EnhancedTask {
                private int channel;
                
                /**
                 * Creates new instance of <code>UpdateInfo</code>.
                 * @param channel The sampler channel to be updated.
                 */
                public
                UpdateInfo(int channel) {
                        setTitle("Channel.UpdateInfo_task");
                        setDescription(i18n.getMessage("Channel.UpdateInfo.desc"));
                        
                        this.channel = channel;
                }
                
                /** The entry point of the task. */
                public void
                run() {
                        try {
                                SamplerModel sm = CC.getSamplerModel();
                                sm.updateChannel(CC.getClient().getSamplerChannelInfo(channel));
                        } catch(Exception x) {
                                /*
                                 * We don't want to bother the user if error occurs when updating
                                 * a channel because in most cases this happens due to a race
                                 * condition between delete/update events. So we just log this
                                 * error instead to indicate the failure of this task.
                                 */
                                String msg = getDescription() + ": " + HF.getErrorMessage(x);
                                CC.getLogger().log(Level.INFO, msg, x);
                        }
                }
                
                /**
                 * Gets the ID of the channel for which information should be obtained.
                 * @return The ID of the channel for which information should be obtained.
                 */
                public int
                getChannelId() { return channel; }
        }

        /**
         * This task creates an additional effect send on the specified sampler channel.
         */
        public static class AddFxSend extends EnhancedTask<Integer> {
                private int channel;
                private int midiCtrl;
                private String name;
                
                /**
                 * Creates a new instance of <code>AddFxSend</code>.
                 * @param channel The sampler channel, on which a new effect send should be added.
                 * @param midiCtrl Defines the MIDI controller, which
                 * will be able alter the effect send level.
                 */
                public
                AddFxSend(int channel, int midiCtrl) {
                        this(channel, midiCtrl, null);
                }
        
                /**
                 * Creates a new instance of <code>AddFxSend</code>.
                 * @param channel The sampler channel, on which a new effect send should be added.
                 * @param midiCtrl Defines the MIDI controller, which
                 * will be able alter the effect send level.
                 * @param name The name of the effect send entity.
                 * The name does not have to be unique.
                 */
                public
                AddFxSend(int channel, int midiCtrl, String name) {
                        setTitle("Channel.AddFxSend_task");
                        setDescription(i18n.getMessage("Channel.AddFxSend.desc"));
                        this.channel = channel;
                        this.midiCtrl = midiCtrl;
                        this.name = name;
                }
        
                /** The entry point of the task. */
                public void
                run() {
                        try { setResult(CC.getClient().createFxSend(channel, midiCtrl, name)); }
                        catch(Exception x) {
                                setErrorMessage(getDescription() + ": " + HF.getErrorMessage(x));
                                CC.getLogger().log(Level.FINE, getErrorMessage(), x);
                                x.printStackTrace();
                        }
                }
        }

        /**
         * This task removes the specified effect send on the specified sampler channel.
         */
        public static class RemoveFxSend extends EnhancedTask {
                private int channel;
                private int fxSend;
                
                /**
                 * Creates a new instance of <code>RemoveFxSend</code>.
                 * @param channel The sampler channel, from which an effect send should be removed.
                 * @param fxSend The ID of the effect send that should be removed.
                 */
                public
                RemoveFxSend(int channel, int fxSend) {
                        setTitle("Channel.RemoveFxSend_task");
                        String s = i18n.getMessage("Channel.RemoveFxSend.desc", channel, fxSend);
                        setDescription(s);
                        this.channel = channel;
                        this.fxSend = fxSend;
                }
        
                /** The entry point of the task. */
                public void
                run() {
                        try { CC.getClient().destroyFxSend(channel, fxSend); }
                        catch(Exception x) {
                                setErrorMessage(getDescription() + ": " + HF.getErrorMessage(x));
                                CC.getLogger().log(Level.FINE, getErrorMessage(), x);
                        }
                }
        }
        
        /**
         * This task gets the list of effect sends on the specified sampler channel.
         */
        public static class GetFxSends extends EnhancedTask<FxSend[]> {
                private int channel;
                
                /**
                 * Creates a new instance of <code>GetFxSends</code>.
                 */
                public
                GetFxSends() { this(-1); }
                
                /**
                 * Creates a new instance of <code>GetFxSends</code>.
                 */
                public
                GetFxSends(int channel) {
                        setTitle("Channel.GetFxSends_task");
                        setDescription(i18n.getMessage("Channel.GetFxSends.desc", channel));
                        
                        this.channel = channel;
                }
        
                /** The entry point of the task. */
                public void
                run() {
                        try { 
                                setResult(CC.getClient().getFxSends(channel));
                        } catch(Exception x) {
                                setErrorMessage(getDescription() + ": " + HF.getErrorMessage(x));
                                CC.getLogger().log(Level.FINE, getErrorMessage(), x);
                        }
                }
                
                /**
                 * Gets the channel ID.
                 */
                public int
                getChannel() { return channel; }
                
                /**
                 * Sets the channel, for which effect sends should be obtained.
                 */
                public void
                setChannel(int channel) {
                        this.channel = channel;
                        setDescription(i18n.getMessage("Channel.GetFxSends.desc", channel));
                }
        }
        
        /**
         * This task updates the list of effect sends on the specified sampler channel.
         */
        public static class UpdateFxSends extends EnhancedTask {
                private int channel;
                
                /**
                 * Creates a new instance of <code>UpdateFxSends</code>.
                 * @param channel The numerical ID of the sampler channel
                 * whose effect send list should be updated.
                 */
                public
                UpdateFxSends(int channel) {
                        setTitle("Channel.UpdateFxSends_task");
                        setDescription(i18n.getMessage("Channel.UpdateFxSends.desc", channel));
                        
                        this.channel = channel;
                }
        
                /** The entry point of the task. */
                public void
                run() {
                        try { 
                                SamplerChannelModel scm;
                                scm = CC.getSamplerModel().getChannelById(channel);
                                Integer[] fxSendIDs = CC.getClient().getFxSendIDs(channel);
                        
                                boolean found = false;
                                
                                for(FxSend fxs : scm.getFxSends()) {
                                        for(int i = 0; i < fxSendIDs.length; i++) {
                                                if(fxSendIDs[i] == fxs.getFxSendId()) {
                                                        fxSendIDs[i] = -1;
                                                        found = true;
                                                }
                                        }
                                
                                        if(!found) scm.removeFxSendById(fxs.getFxSendId());
                                        found = false;
                                }
                        
                                FxSend fxs;
                                
                                for(int id : fxSendIDs) {
                                        if(id >= 0) {
                                                fxs = CC.getClient().getFxSendInfo(channel, id);
                                                scm.addFxSend(fxs);
                                        }
                                }
                        } catch(Exception x) {
                                setErrorMessage(getDescription() + ": " + HF.getErrorMessage(x));
                                CC.getLogger().log(Level.FINE, getErrorMessage(), x);
                        }
                }
        }
        
        /**
         * This task updates the settings of a specific effect send.
         */
        public static class UpdateFxSendInfo extends EnhancedTask {
                private int channel;
                private int fxSend;
                
                /**
                 * Creates new instance of <code>UpdateFxSendInfo</code>.
                 * @param channel The numerical ID of the sampler channel
                 * containing the effect send entity that should be updated.
                 * @param fxSend The numerical ID of the effect send
                 * that should be updated.
                 */
                public
                UpdateFxSendInfo(int channel, int fxSend) {
                        setTitle("Channel.UpdateFxSendInfo_task");
                        String s = "Channel.UpdateFxSendInfo.desc";
                        setDescription(i18n.getMessage(s, channel, fxSend));
                        
                        this.channel = channel;
                        this.fxSend = fxSend;
                }
                
                /** The entry point of the task. */
                public void
                run() {
                        try {
                                SamplerChannelModel scm;
                                scm = CC.getSamplerModel().getChannelById(channel);
                                scm.updateFxSend(CC.getClient().getFxSendInfo(channel, fxSend));
                        } catch(Exception x) {
                                /*
                                 * We don't want to bother the user if error occurs when updating
                                 * an effect send because in most cases this happens due to a race
                                 * condition between delete/update events. So we just log this
                                 * error instead to indicate the failure of this task.
                                 */
                                String msg = getDescription() + ": " + HF.getErrorMessage(x);
                                CC.getLogger().log(Level.INFO, msg, x);
                        }
                }
        }

        /**
         * This taks changes the name of a specific effect send.
         */
        public static class SetFxSendName extends EnhancedTask {
                private int channel;
                private int fxSend;
                private String name;
        
                /**
                 * Creates new instance of <code>SetFxSendName</code>.
                 * @param channel The sampler channel number.
                 * @param fxSend The numerical ID of the effect
                 * send, which name should be changed.
                 * @param name The new name of the effect send entity.
                 */
                public
                SetFxSendName(int channel, int fxSend, String name) {
                        setTitle("Channel.SetFxSendName_task");
                        String s = "Channel.SetFxSendName.desc";
                        setDescription(i18n.getMessage(s, channel, fxSend));
                
                        this.channel = channel;
                        this.fxSend = fxSend;
                        this.name = name;
                }
        
                /** The entry point of the task. */
                public void
                run() {
                        try { CC.getClient().setFxSendName(channel, fxSend, name); }
                        catch(Exception x) {
                                setErrorMessage(getDescription() + ": " + HF.getErrorMessage(x));
                                CC.getLogger().log(Level.FINE, getErrorMessage(), x);
                        }
                }
        }
        
        /**
         * This taks sets the MIDI controller of a specific effect send.
         */
        public static class SetFxSendAudioOutputChannel extends EnhancedTask {
                private int channel;
                private int fxSend;
                private int audioSrc;
                private int audioDst;
                
                /**
                 * Creates new instance of <code>SetFxSendAudioOutputChannel</code>.
                 * @param channel The sampler channel number.
                 * @param fxSend The numerical ID of the effect send entity to be rerouted.
                 * @param audioSrc The numerical ID of the effect send's audio output channel,
                 * which should be rerouted.
                 * @param audioDst The audio channel of the selected audio output device
                 * where <code>audioSrc</code> should be routed to.
                 */
                public
                SetFxSendAudioOutputChannel(int channel, int fxSend, int audioSrc, int audioDst) {
                        setTitle("Channel.SetFxSendAudioOutputChannel_task");
                        String s = "Channel.SetFxSendAudioOutputChannel.desc";
                        setDescription(i18n.getMessage(s, channel, fxSend));
                
                        this.channel = channel;
                        this.fxSend = fxSend;
                        this.audioSrc = audioSrc;
                        this.audioDst = audioDst;
                }
        
                /** The entry point of the task. */
                public void
                run() {
                        try { 
                                CC.getClient().setFxSendAudioOutputChannel (
                                        channel, fxSend, audioSrc, audioDst
                                );
                        }
                        catch(Exception x) {
                                setErrorMessage(getDescription() + ": " + HF.getErrorMessage(x));
                                CC.getLogger().log(Level.FINE, getErrorMessage(), x);
                        }
                }
        }
        
        /**
         * This taks sets the volume of a specific effect send.
         */
        public static class SetFxSendLevel extends EnhancedTask {
                private int channel;
                private int fxSend;
                private float volume;
        
                /**
                 * Creates new instance of <code>SetFxSendLevel</code>.
                 * @param channel The sampler channel number.
                 * @param fxSend The numerical ID of the effect send, which
                 * volume should be changed.
                 * @param volume The new volume value.
                 */
                public
                SetFxSendLevel(int channel, int fxSend, float volume) {
                        setTitle("Channel.SetFxSendLevel_task");
                        String s = i18n.getMessage("Channel.SetFxSendLevel.desc", channel, fxSend);
                        setDescription(s);
                
                        this.channel = channel;
                        this.fxSend = fxSend;
                        this.volume = volume;
                }
        
                /** The entry point of the task. */
                public void
                run() {
                        try { CC.getClient().setFxSendLevel(channel, fxSend, volume); }
                        catch(Exception x) {
                                setErrorMessage(getDescription() + ": " + HF.getErrorMessage(x));
                                CC.getLogger().log(Level.FINE, getErrorMessage(), x);
                        }
                }
        }

        /**
         * This taks sets the MIDI controller of a specific effect send.
         */
        public static class SetFxSendMidiController extends EnhancedTask {
                private int channel;
                private int fxSend;
                private int midiCtrl;
        
                /**
                 * Creates new instance of <code>SetFxSendMidiController</code>.
                 * @param channel The sampler channel number.
                 * @param fxSend The numerical ID of the effect
                 * send, which MIDI controller should be changed.
                 * @param midiCtrl The MIDI controller which shall be
                 * able to modify the effect send's send level.
                 */
                public
                SetFxSendMidiController(int channel, int fxSend, int midiCtrl) {
                        setTitle("Channel.SetFxSendMidiController_task");
                        String s = "Channel.SetFxSendMidiController.desc";
                        setDescription(i18n.getMessage(s, channel, fxSend));
                
                        this.channel = channel;
                        this.fxSend = fxSend;
                        this.midiCtrl = midiCtrl;
                }
        
                /** The entry point of the task. */
                public void
                run() {
                        try { CC.getClient().setFxSendMidiController(channel, fxSend, midiCtrl); }
                        catch(Exception x) {
                                setErrorMessage(getDescription() + ": " + HF.getErrorMessage(x));
                                CC.getLogger().log(Level.FINE, getErrorMessage(), x);
                        }
                }
        }

}