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001package com.pusher.client.util;
002
003import java.net.Proxy;
004import java.net.URI;
005import java.net.URISyntaxException;
006import java.util.concurrent.ExecutorService;
007import java.util.concurrent.Executors;
008import java.util.concurrent.ScheduledExecutorService;
009import java.util.concurrent.ThreadFactory;
010
011import javax.net.ssl.SSLException;
012
013import org.java_websocket.client.WebSocketClient;
014
015import com.pusher.client.Authorizer;
016import com.pusher.client.PusherOptions;
017import com.pusher.client.channel.impl.ChannelImpl;
018import com.pusher.client.channel.impl.ChannelManager;
019import com.pusher.client.channel.impl.PresenceChannelImpl;
020import com.pusher.client.channel.impl.PrivateChannelImpl;
021import com.pusher.client.connection.impl.InternalConnection;
022import com.pusher.client.connection.websocket.WebSocketClientWrapper;
023import com.pusher.client.connection.websocket.WebSocketConnection;
024import com.pusher.client.connection.websocket.WebSocketListener;
025
026/**
027 * This is a lightweight way of doing dependency injection and enabling classes
028 * to be unit tested in isolation. No class in this library instantiates another
029 * class directly, otherwise they would be tightly coupled. Instead, they all
030 * call the factory methods in this class when they want to create instances of
031 * another class.
032 *
033 * An instance of Factory is provided on construction to each class which may
034 * require it, the initial factory is instantiated in the Pusher constructor,
035 * the only constructor which a library consumer should need to call directly.
036 *
037 * Conventions:
038 *
039 * - any method that starts with "new", such as
040 * {@link #newPublicChannel(String)} creates a new instance of that class every
041 * time it is called.
042 *
043 */
044public class Factory {
045
046    private InternalConnection connection;
047    private ChannelManager channelManager;
048    private ExecutorService eventQueue;
049    private ScheduledExecutorService timers;
050    private static final Object eventLock = new Object();
051
052    public synchronized InternalConnection getConnection(final String apiKey, final PusherOptions options) {
053        if (connection == null) {
054            try {
055                connection = new WebSocketConnection(options.buildUrl(apiKey), options.getActivityTimeout(),
056                        options.getPongTimeout(), options.getProxy(), this);
057            }
058            catch (final URISyntaxException e) {
059                throw new IllegalArgumentException("Failed to initialise connection", e);
060            }
061        }
062        return connection;
063    }
064
065    public WebSocketClientWrapper newWebSocketClientWrapper(final URI uri, final Proxy proxy, final WebSocketListener webSocketListener) throws SSLException {
066        return new WebSocketClientWrapper(uri, proxy, webSocketListener);
067    }
068
069    public synchronized ScheduledExecutorService getTimers() {
070        if (timers == null) {
071            timers = Executors.newSingleThreadScheduledExecutor(new DaemonThreadFactory("timers"));
072        }
073        return timers;
074    }
075
076    public ChannelImpl newPublicChannel(final String channelName) {
077        return new ChannelImpl(channelName, this);
078    }
079
080    public PrivateChannelImpl newPrivateChannel(final InternalConnection connection, final String channelName,
081            final Authorizer authorizer) {
082        return new PrivateChannelImpl(connection, channelName, authorizer, this);
083    }
084
085    public PresenceChannelImpl newPresenceChannel(final InternalConnection connection, final String channelName,
086            final Authorizer authorizer) {
087        return new PresenceChannelImpl(connection, channelName, authorizer, this);
088    }
089
090    public synchronized ChannelManager getChannelManager() {
091        if (channelManager == null) {
092            channelManager = new ChannelManager(this);
093        }
094        return channelManager;
095    }
096
097    public synchronized void queueOnEventThread(final Runnable r) {
098        if (eventQueue == null) {
099            eventQueue = Executors.newSingleThreadExecutor(new DaemonThreadFactory("eventQueue"));
100        }
101        eventQueue.execute(new Runnable() {
102            @Override
103            public void run() {
104                synchronized (eventLock) {
105                    r.run();
106                }
107            }
108        });
109    }
110
111    public synchronized void shutdownThreads() {
112        if (eventQueue != null) {
113            eventQueue.shutdown();
114            eventQueue = null;
115        }
116        if (timers != null) {
117            timers.shutdown();
118            timers = null;
119        }
120    }
121
122    private static class DaemonThreadFactory implements ThreadFactory {
123        private final String name;
124
125        public DaemonThreadFactory(final String name) {
126            this.name = name;
127        }
128
129        @Override
130        public Thread newThread(final Runnable r) {
131            final Thread t = new Thread(r);
132            t.setDaemon(true);
133            t.setName("pusher-java-client " + name);
134            return t;
135        }
136    }
137}