/*
* Copyright 2010-2011, Social Music Discovery project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Social Music Discovery project nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL SOCIAL MUSIC DISCOVERY PROJECT BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.socialmusicdiscovery.server.business.logic.injections;
import com.google.inject.AbstractModule;
import com.google.inject.Provides;
import com.google.inject.Singleton;
import org.socialmusicdiscovery.server.api.plugin.Plugin;
import org.socialmusicdiscovery.server.business.logic.PluginManager;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.ServiceLoader;
/**
* Provides the singleton instance of the {@link PluginManager} which manage all plugins in the application.
* The plugins are found using {@link ServiceLoader} which looks up all registered implementations of the {@link Plugin} interface.
*/
public class PluginManagerModule extends AbstractModule {
private static PluginManager pluginManager;
@Override
protected void configure() {
}
@Provides
@Singleton
public PluginManager providePluginManager() {
if (pluginManager == null) {
// Load all plugins registered in:
// /META-INF/services/org.socialmusicdiscovery.server.api.plugin.Plugin
Map<String, Plugin> plugins = new HashMap<String, Plugin>();
ServiceLoader<Plugin> pluginLoader = ServiceLoader.load(Plugin.class);
Iterator<Plugin> pluginIterator = pluginLoader.iterator();
while (pluginIterator.hasNext()) {
Plugin plugin = pluginIterator.next();
plugins.put(plugin.getId(), plugin);
}
pluginManager = new PluginManager(plugins);
}
return pluginManager;
}
}