src/java.desktop/share/classes/com/sun/media/sound/SoftMixingMixerProvider.java

/*
 * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package com.sun.media.sound;

import javax.sound.sampled.Mixer;
import javax.sound.sampled.Mixer.Info;
import javax.sound.sampled.spi.MixerProvider;

/**
 * Provider for software audio mixer.
 *
 * @author Karl Helgason
 */
public final class SoftMixingMixerProvider extends MixerProvider {

    static SoftMixingMixer globalmixer = null;

    static Thread lockthread = null;

    static final Object mutex = new Object();

    @Override
    public Mixer getMixer(Info info) {
        if (!(info == null || info == SoftMixingMixer.info)) {
            throw new IllegalArgumentException("Mixer " + info.toString()
                    + " not supported by this provider.");
        }
        synchronized (mutex) {
            if (lockthread != null)
                if (Thread.currentThread() == lockthread)
                    throw new IllegalArgumentException("Mixer "
                            + info.toString()
                            + " not supported by this provider.");
            if (globalmixer == null)
                globalmixer = new SoftMixingMixer();
            return globalmixer;
        }
    }

    @Override
    public Info[] getMixerInfo() {
        return new Info[] { SoftMixingMixer.info };
    }
}