/jWebSocket/shared/J2SE/jWebSocketServer/org/jwebsocket/plugins/channels/ChannelManager.java

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//  Copyright (c) 2010 Innotrade GmbH, jWebSocket.org
//  ---------------------------------------------------------------------------
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//  under the terms of the GNU Lesser General Public License as published by the
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//  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
//  FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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//  ---------------------------------------------------------------------------
package org.jwebsocket.plugins.channels;

import java.util.Collections;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.jwebsocket.api.WebSocketConnector;
import org.jwebsocket.config.JWebSocketCommonConstants;
import org.jwebsocket.config.JWebSocketConfig;
import org.jwebsocket.config.JWebSocketServerConstants;
import org.jwebsocket.config.xml.ChannelConfig;
import org.jwebsocket.security.SecurityFactory;
import org.jwebsocket.security.User;
import org.jwebsocket.token.Token;
import org.jwebsocket.token.TokenFactory;

/**
 * Manager class responsible for all the channel operations within the
 * jWebSocket server system.
 * 
 * @author puran
 * @version $Id: ChannelManager.java 1425 2011-01-04 18:56:34Z fivefeetfurther $
 */
public class ChannelManager {

	/** id for the logger channel */
	private static final String LOGGER_CHANNEL_ID = "jws.logger.channel";
	/** id for the admin channel */
	private static final String ADMIN_CHANNEL_ID = "jws.admin.channel";
	/** settings key strings */
	private static final String USE_PERSISTENT_STORE = "use_persistent_store";
	private static final String ALLOW_NEW_CHANNELS = "allow_new_channels";
	/** persistent storage objects */
	private final ChannelStore mChannelStore = new BaseChannelStore();
	private final SubscriberStore mSubscriberStore = new BaseSubscriberStore();
	private final PublisherStore mPublisherStore = new BasePublisherStore();
	/** in-memory store maps */
	private final Map<String, Channel> mSystemChannels = new ConcurrentHashMap<String, Channel>();
	private final Map<String, Channel> mPrivateChannels = new ConcurrentHashMap<String, Channel>();
	private final Map<String, Channel> mPublicChannels = new ConcurrentHashMap<String, Channel>();
	private Map<String, String> mChannelPluginSettings = null;
	/**
	 * Logger channel that publish all the logs in jWebSocket system
	 */
	private static Channel mLoggerChannel = null;
	/**
	 * admin channel to monitor channel plugin activity
	 */
	private static Channel mAdminChannel = null;
	/** setting to check for persistent storage or not */
	public static boolean usePersistentStore;
	/** setting to check if new channel creation or registration is allowed */
	public static boolean allowNewChannels;

	private ChannelManager(Map<String, String> aSettings) {
		this.mChannelPluginSettings = new ConcurrentHashMap<String, String>(aSettings);
		String lUsePersisentStore = mChannelPluginSettings.get(USE_PERSISTENT_STORE);
		if (lUsePersisentStore != null && lUsePersisentStore.equals("true")) {
			usePersistentStore = true;
		}
		String lAllowNewChannels = mChannelPluginSettings.get(ALLOW_NEW_CHANNELS);
		if (lAllowNewChannels != null && lAllowNewChannels.equals("true")) {
			allowNewChannels = true;
		}
	}

	/**
	 * @return the static manager instance
	 */
	public static ChannelManager getChannelManager(Map<String, String> aSettings) {
		return new ChannelManager(aSettings);
	}

	/**
	 * Starts the system channels within the jWebSocket system configured via
	 * jWebSocket.xml, Note that it doesn't insert the system channels to the
	 * channel store.
	 *
	 * @throws ChannelLifeCycleException
	 *             if exception starting the system channels
	 */
	public void startSystemChannels() throws ChannelLifeCycleException {
		User lRoot = SecurityFactory.getRootUser();
		// TODO: Process if no root user could be found!
		JWebSocketConfig lConfig = JWebSocketConfig.getConfig();
		for (ChannelConfig lCfg : lConfig.getChannels()) {
			if (lCfg.isSystemChannel()) {
				lCfg.validate();
				if (LOGGER_CHANNEL_ID.equals(lCfg.getId())) {
					mLoggerChannel = new Channel(lCfg);
					mLoggerChannel.start(lRoot.getLoginname());
				} else if (ADMIN_CHANNEL_ID.equals(lCfg.getId())) {
					mAdminChannel = new Channel(lCfg);
					mAdminChannel.start(lRoot.getLoginname());
				} else {
					Channel lChannel = new Channel(lCfg);
					lChannel.start(lRoot.getLoginname());
					// put in system channels map
					mSystemChannels.put(lChannel.getId(), lChannel);
				}
			}
		}
	}

	/**
	 * Stops all the system channels running in the system and clears the system
	 * channels map
	 */
	public void stopSystemChannels() throws ChannelLifeCycleException {
		User root = SecurityFactory.getRootUser();
		for (Map.Entry<String, Channel> entry : mSystemChannels.entrySet()) {
			Channel channel = entry.getValue();
			channel.stop(root.getLoginname());
		}
		mSystemChannels.clear();
		if (mLoggerChannel != null) {
			mLoggerChannel.stop(root.getLoginname());
		}
		if (mAdminChannel != null) {
			mAdminChannel.stop(root.getLoginname());
		}
	}

	/**
	 * Returns the channel registered in the jWebSocket system based on channel
	 * id it does a various lookup and then if it doesn't find anywhere from the
	 * memory it loads the channel from the database. If it doesn' find anything
	 * then it returns the null object
	 *
	 * @param aChannelId
	 * @return channel object, null if not found
	 */
	public Channel getChannel(String aChannelId) {
		if (mSystemChannels.containsKey(aChannelId)) {
			return mSystemChannels.get(aChannelId);
		}
		if (mPrivateChannels.containsKey(aChannelId)) {
			return mPrivateChannels.get(aChannelId);
		}
		if (mPublicChannels.containsKey(aChannelId)) {
			return mPublicChannels.get(aChannelId);
		}
		if (usePersistentStore) {
			// if not anywhere then look in the channel store
			Channel channel = mChannelStore.getChannel(aChannelId);
			if (channel != null) {
				mPublicChannels.put(aChannelId, channel);
			}
			return channel;
		}
		return null;
	}

	/**
	 * Register the given channel to the list of channels maintained by the
	 * jWebSocket system.
	 *
	 * @param aChannel
	 *            the channel to store.
	 */
	public void registerChannel(Channel aChannel) {
		if (aChannel.isSystemChannel()) {
			mSystemChannels.put(aChannel.getId(), aChannel);
		} else if (aChannel.isPrivateChannel()) {
			mPrivateChannels.put(aChannel.getId(), aChannel);
		} else {
			mPublicChannels.put(aChannel.getId(), aChannel);
		}
		if (usePersistentStore) {
			mChannelStore.storeChannel(aChannel);
		}
	}

	/**
	 * Returns the registered subscriber object for the given subscriber id
	 *
	 * @param aSubscriberId
	 *            the subscriber id
	 * @return the subscriber object
	 */
	public Subscriber getSubscriber(String aSubscriberId) {
		return mSubscriberStore.getSubscriber(aSubscriberId);
	}

	/**
	 * Stores the registered subscriber information in the channel store
	 *
	 * @param aSubscriber
	 *            the subscriber to register
	 */
	public void storeSubscriber(Subscriber aSubscriber) {
		mSubscriberStore.storeSubscriber(aSubscriber);
	}

	/**
	 * Removes the given subscriber information from channel store
	 *
	 * @param aSubscriber
	 *            the subscriber object
	 */
	public void removeSubscriber(Subscriber aSubscriber) {
		mSubscriberStore.removeSubscriber(aSubscriber.getId());
	}

	/**
	 * Returns the registered publisher for the given publisher id
	 *
	 * @param aPublisherId
	 *            the publisher id
	 * @return the publisher object
	 */
	public Publisher getPublisher(String aPublisherId) {
		return mPublisherStore.getPublisher(aPublisherId);
	}

	/**
	 * Stores the given publisher to the channel store
	 *
	 * @param publisher
	 *            the publisher object to store
	 */
	public void storePublisher(Publisher aPublisher) {
		mPublisherStore.storePublisher(aPublisher);
	}

	/**
	 * Removes the publisher from the channel store permanently
	 *
	 * @param aPublisher
	 *            the publisher to remove
	 */
	public void removePublisher(Publisher aPublisher) {
		mPublisherStore.removePublisher(aPublisher.getId());
	}

	/**
	 * Returns the instance of the logger channel.If not initialized for some
	 * reason returns null.
	 *
	 * @return the logger channel
	 */
	public static Channel getLoggerChannel() {
		return mLoggerChannel;
	}

	/**
	 * Returns the instance of the admin channel. If not initialized for some
	 * reasons returns null.
	 *
	 * @return the admin channel
	 */
	public static Channel getAdminChannel() {
		return mAdminChannel;
	}

	public void publishToLoggerChannel(Token aToken) {
		Channel lLoggerChannel = getLoggerChannel();
		// Added by Alex:
		if (lLoggerChannel != null) {
			lLoggerChannel.broadcastToken(aToken);
		}
	}

	/**
	 * Returns the error token
	 *
	 * @param aConnector
	 *            the target connector object
	 * @param aChannelId
	 *            the channelId
	 * @param aMessage
	 *            the error message
	 * @return the error token
	 */
	public Token getErrorToken(WebSocketConnector aConnector, String aChannelId, String aMessage) {
		Token logToken = getBaseChannelResponse(aConnector, aChannelId);
		logToken.setString("event", "error");
		logToken.setString("error", aMessage);

		return logToken;
	}

	/**
	 * Returns the basic response token for a channel
	 *
	 * @param aConnector
	 *            the target connector object
	 * @param aChannel
	 *            the target channel
	 * @return the base token of type channel
	 */
	public Token getBaseChannelResponse(WebSocketConnector aConnector, String aChannel) {
		Token channelToken = TokenFactory.createToken("channel");

		// TODO: In clusters, especially for service nodes we will post these fields on a lower level!
		// check! Commented out by Alex
		// channelToken.setString("vendor", JWebSocketCommonConstants.VENDOR);
		// channelToken.setString("version", JWebSocketServerConstants.VERSION_STR);
		// Alex: These fields are mandatory
		channelToken.setString("sourceId", aConnector.getId());
		channelToken.setString("channelId", aChannel);

		return channelToken;
	}

	public Token getChannelSuccessToken(WebSocketConnector aConnector, String aChannel, ChannelEventEnum aEventType) {
		Token lToken = getBaseChannelResponse(aConnector, aChannel);
		String lEvent = "";
		switch (aEventType) {
			case LOGIN:
				lEvent = "login";
				break;
			case AUTHORIZE:
				lEvent = "authorize";
				break;
			case PUBLISH:
				lEvent = "publish";
				break;
			case SUSCRIBE:
				lEvent = "subscribe";
			case UNSUSCRIBE:
				lEvent = "unsuscribe";
				break;
			default:
				break;
		}
		lToken.setString("event", lEvent);
		lToken.setString("status", "ok");

		return lToken;
	}

	/**
	 * @return the system channels
	 */
	public Map<String, Channel> getSystemChannels() {
		return Collections.unmodifiableMap(mSystemChannels);
	}

	/**
	 * @return the private channels
	 */
	public Map<String, Channel> getPrivateChannels() {
		return Collections.unmodifiableMap(mPrivateChannels);
	}

	/**
	 * @return the public channels
	 */
	public Map<String, Channel> getPublicChannels() {
		return Collections.unmodifiableMap(mPublicChannels);
	}
}