Class BayeuxClient

  • All Implemented Interfaces:
    org.cometd.bayeux.Bayeux, org.cometd.bayeux.client.ClientSession, org.cometd.bayeux.Session, org.eclipse.jetty.util.component.Dumpable

    public class BayeuxClient
    extends org.cometd.common.AbstractClientSession
    implements org.cometd.bayeux.Bayeux

    BayeuxClient is the implementation of a client for the Bayeux protocol.

    A BayeuxClient can receive/publish messages from/to a Bayeux server, and it is the counterpart in Java of the JavaScript library used in browsers (and as such it is ideal for Swing applications, load testing tools, etc.).

    A BayeuxClient handshakes with a Bayeux server and then subscribes ClientSessionChannel.MessageListener to channels in order to receive messages, and may also publish messages to the Bayeux server.

    BayeuxClient relies on pluggable transports for communication with the Bayeux server, and the most common transport is LongPollingTransport, which uses HTTP to transport Bayeux messages and it is based on Jetty's HTTP client.

    When the communication with the server is finished, the BayeuxClient can be disconnected from the Bayeux server.

    Typical usage:

     // Handshake
     String url = "http://localhost:8080/cometd";
     BayeuxClient client = new BayeuxClient(url, LongPollingTransport.create(null));
     client.handshake();
     client.waitFor(1000, BayeuxClient.State.CONNECTED);
    
     // Subscription to channels
     ClientSessionChannel channel = client.getChannel("/foo");
     channel.subscribe(new ClientSessionChannel.MessageListener()
     {
         public void onMessage(ClientSessionChannel channel, Message message)
         {
             // Handle the message
         }
     });
    
     // Publishing to channels
     Map<String, Object> data = new HashMap<String, Object>();
     data.put("bar", "baz");
     channel.publish(data);
    
     // Disconnecting
     client.disconnect();
     client.waitFor(1000, BayeuxClient.State.DISCONNECTED);
     
    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description
      protected class  BayeuxClient.BayeuxClientChannel
      A channel scoped to this BayeuxClient.
      static class  BayeuxClient.State
      The states that a BayeuxClient may assume.
      • Nested classes/interfaces inherited from class org.cometd.common.AbstractClientSession

        org.cometd.common.AbstractClientSession.AbstractSessionChannel
      • Nested classes/interfaces inherited from interface org.cometd.bayeux.Bayeux

        org.cometd.bayeux.Bayeux.BayeuxListener
      • Nested classes/interfaces inherited from interface org.cometd.bayeux.client.ClientSession

        org.cometd.bayeux.client.ClientSession.Extension, org.cometd.bayeux.client.ClientSession.MessageListener
    • Constructor Summary

      Constructors 
      Constructor Description
      BayeuxClient​(java.lang.String url, java.util.concurrent.ScheduledExecutorService scheduler, ClientTransport transport, ClientTransport... transports)
      Creates a BayeuxClient that will connect to the Bayeux server at the given URL, with the given scheduler and with the given transport(s).
      BayeuxClient​(java.lang.String url, ClientTransport transport, ClientTransport... transports)
      Creates a BayeuxClient that will connect to the Bayeux server at the given URL and with the given transport(s).
    • Method Summary

      All Methods Instance Methods Concrete Methods Deprecated Methods 
      Modifier and Type Method Description
      void abort()
      Interrupts abruptly the communication with the Bayeux server.
      boolean disconnect​(long timeout)
      Performs a disconnect and uses the given timeout to wait for the disconnect to complete.
      void disconnect​(org.cometd.bayeux.client.ClientSession.MessageListener callback)  
      protected void enqueueSend​(org.cometd.bayeux.Message.Mutable message)  
      java.util.List<java.lang.String> getAllowedTransports()  
      long getBackoff()  
      long getBackoffIncrement()  
      java.net.HttpCookie getCookie​(java.lang.String name)
      Retrieves the first cookie with the given name, if available.
      java.net.CookieStore getCookieStore()  
      java.lang.String getId()  
      java.util.Set<java.lang.String> getKnownTransportNames()  
      long getMaxBackoff()  
      java.lang.Object getOption​(java.lang.String qualifiedName)  
      java.util.Set<java.lang.String> getOptionNames()  
      java.util.Map<java.lang.String,​java.lang.Object> getOptions()  
      protected BayeuxClient.State getState()  
      ClientTransport getTransport()  
      ClientTransport getTransport​(java.lang.String transport)  
      java.lang.String getURL()  
      BayeuxClient.State handshake​(long waitMs)
      Performs the handshake and waits at most the given time for the handshake to complete.
      BayeuxClient.State handshake​(java.util.Map<java.lang.String,​java.lang.Object> template, long waitMs)
      Performs the handshake with the given template and waits at most the given time for the handshake to complete.
      void handshake​(java.util.Map<java.lang.String,​java.lang.Object> fields, org.cometd.bayeux.client.ClientSession.MessageListener callback)  
      void handshake​(org.cometd.bayeux.client.ClientSession.MessageListener callback)  
      void handshake​(org.cometd.bayeux.client.ClientSessionChannel.MessageListener callback)
      Deprecated.
      protected void initialize()  
      boolean isConnected()  
      boolean isDisconnected()  
      boolean isHandshook()  
      protected void messagesFailure​(java.lang.Throwable cause, java.util.List<? extends org.cometd.bayeux.Message> messages)  
      protected org.cometd.common.AbstractClientSession.AbstractSessionChannel newChannel​(org.cometd.bayeux.ChannelId channelId)  
      protected org.cometd.bayeux.ChannelId newChannelId​(java.lang.String channelId)  
      void onFailure​(java.lang.Throwable failure, java.util.List<? extends org.cometd.bayeux.Message> messages)
      Callback method invoked when the given messages have failed to be sent.
      void onMessages​(java.util.List<org.cometd.bayeux.Message.Mutable> messages)
      Callback method invoke when the given messages have just arrived from the Bayeux server.
      void onSending​(java.util.List<? extends org.cometd.bayeux.Message> messages)
      Callback method invoked when the given messages have hit the network towards the Bayeux server.
      protected void onTransportFailure​(java.lang.String oldTransportName, java.lang.String newTransportName, java.lang.Throwable failure)  
      protected void onTransportFailure​(org.cometd.bayeux.Message message, ClientTransport.FailureInfo failureInfo, ClientTransport.FailureHandler handler)  
      protected void processConnect​(org.cometd.bayeux.Message.Mutable connect)  
      protected void processDisconnect​(org.cometd.bayeux.Message.Mutable disconnect)  
      protected void processHandshake​(org.cometd.bayeux.Message.Mutable handshake)  
      protected void processMessage​(org.cometd.bayeux.Message.Mutable message)  
      void putCookie​(java.net.HttpCookie cookie)  
      protected boolean scheduleConnect​(long interval, long backOff)  
      protected boolean scheduleHandshake​(long interval, long backOff)  
      protected void send​(org.cometd.bayeux.Message.Mutable message)  
      protected void sendBatch()  
      protected void sendConnect()  
      protected void sendHandshake()  
      protected void sendMessages​(java.util.List<org.cometd.bayeux.Message.Mutable> messages, org.cometd.bayeux.Promise<java.lang.Boolean> promise)  
      void setOption​(java.lang.String qualifiedName, java.lang.Object value)  
      protected void terminate()  
      java.lang.String toString()  
      boolean waitFor​(long waitMs, BayeuxClient.State state, BayeuxClient.State... states)
      Waits for this BayeuxClient to reach the given state(s) within the given time.
      • Methods inherited from class org.cometd.common.AbstractClientSession

        addExtension, batch, dump, dump, endBatch, extendIncoming, extendOutgoing, getAttribute, getAttributeNames, getChannel, getChannel, getChannels, getExtensions, isBatching, newMessage, newMessageId, notifyCallback, notifyListeners, receive, registerCallback, registerSubscriber, remoteCall, removeAttribute, removeExtension, resetSubscriptions, setAttribute, startBatch, unregisterCallback, unregisterSubscriber
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
      • Methods inherited from interface org.cometd.bayeux.client.ClientSession

        disconnect, disconnect, handshake, handshake, handshake
    • Field Detail

      • BACKOFF_INCREMENT_OPTION

        public static final java.lang.String BACKOFF_INCREMENT_OPTION
        See Also:
        Constant Field Values
      • MAX_BACKOFF_OPTION

        public static final java.lang.String MAX_BACKOFF_OPTION
        See Also:
        Constant Field Values
      • logger

        protected final org.slf4j.Logger logger
    • Constructor Detail

      • BayeuxClient

        public BayeuxClient​(java.lang.String url,
                            ClientTransport transport,
                            ClientTransport... transports)

        Creates a BayeuxClient that will connect to the Bayeux server at the given URL and with the given transport(s).

        This constructor allocates a new scheduler; it is recommended that when creating a large number of BayeuxClients a shared scheduler is used.

        Parameters:
        url - the Bayeux server URL to connect to
        transport - the default (mandatory) transport to use
        transports - additional optional transports to use in case the default transport cannot be used
        See Also:
        BayeuxClient(String, ScheduledExecutorService, ClientTransport, ClientTransport...)
      • BayeuxClient

        public BayeuxClient​(java.lang.String url,
                            java.util.concurrent.ScheduledExecutorService scheduler,
                            ClientTransport transport,
                            ClientTransport... transports)

        Creates a BayeuxClient that will connect to the Bayeux server at the given URL, with the given scheduler and with the given transport(s).

        Parameters:
        url - the Bayeux server URL to connect to
        scheduler - the scheduler to use for scheduling timed operations
        transport - the default (mandatory) transport to use
        transports - additional optional transports to use in case the default transport cannot be used
    • Method Detail

      • getURL

        public java.lang.String getURL()
        Returns:
        the URL passed when constructing this instance
      • getBackoff

        public long getBackoff()
        Returns:
        the current period of time to wait before trying to reconnect
      • getBackoffIncrement

        public long getBackoffIncrement()
        Returns:
        the period of time that increments the pause to wait before trying to reconnect after each failed attempt to connect to the Bayeux server
        See Also:
        getMaxBackoff()
      • getMaxBackoff

        public long getMaxBackoff()
        Returns:
        the maximum pause to wait before trying to reconnect after each failed attempt to connect to the Bayeux server
        See Also:
        getBackoffIncrement()
      • getCookieStore

        public java.net.CookieStore getCookieStore()
      • getCookie

        public java.net.HttpCookie getCookie​(java.lang.String name)

        Retrieves the first cookie with the given name, if available.

        Note that currently only HTTP transports support cookies.

        Parameters:
        name - the cookie name
        Returns:
        the cookie, or null if no such cookie is found
        See Also:
        putCookie(HttpCookie)
      • putCookie

        public void putCookie​(java.net.HttpCookie cookie)
      • getId

        public java.lang.String getId()
        Specified by:
        getId in interface org.cometd.bayeux.Session
      • isHandshook

        public boolean isHandshook()
        Specified by:
        isHandshook in interface org.cometd.bayeux.Session
      • isConnected

        public boolean isConnected()
        Specified by:
        isConnected in interface org.cometd.bayeux.Session
      • isDisconnected

        public boolean isDisconnected()
        Returns:
        whether this BayeuxClient is terminating or disconnected
      • getState

        protected BayeuxClient.State getState()
        Returns:
        the current state of this BayeuxClient
      • handshake

        @Deprecated
        public void handshake​(org.cometd.bayeux.client.ClientSessionChannel.MessageListener callback)
        Deprecated.
        Parameters:
        callback - the message listener to notify of the handshake result
      • handshake

        public void handshake​(org.cometd.bayeux.client.ClientSession.MessageListener callback)
      • handshake

        public void handshake​(java.util.Map<java.lang.String,​java.lang.Object> fields,
                              org.cometd.bayeux.client.ClientSession.MessageListener callback)
        Specified by:
        handshake in interface org.cometd.bayeux.client.ClientSession
      • handshake

        public BayeuxClient.State handshake​(long waitMs)

        Performs the handshake and waits at most the given time for the handshake to complete.

        When this method returns, the handshake may have failed (for example because the Bayeux server denied it), so it is important to check the return value to know whether the handshake completed or not.

        Parameters:
        waitMs - the time to wait for the handshake to complete
        Returns:
        the state of this BayeuxClient
        See Also:
        handshake(Map, long)
      • handshake

        public BayeuxClient.State handshake​(java.util.Map<java.lang.String,​java.lang.Object> template,
                                            long waitMs)

        Performs the handshake with the given template and waits at most the given time for the handshake to complete.

        When this method returns, the handshake may have failed (for example because the Bayeux server denied it), so it is important to check the return value to know whether the handshake completed or not.

        Parameters:
        template - the template object to be merged with the handshake message
        waitMs - the time to wait for the handshake to complete
        Returns:
        the state of this BayeuxClient
        See Also:
        handshake(long)
      • sendHandshake

        protected void sendHandshake()
      • waitFor

        public boolean waitFor​(long waitMs,
                               BayeuxClient.State state,
                               BayeuxClient.State... states)

        Waits for this BayeuxClient to reach the given state(s) within the given time.

        Parameters:
        waitMs - the time to wait to reach the given state(s)
        state - the state to reach
        states - additional states to reach in alternative
        Returns:
        true if one of the state(s) has been reached within the given time, false otherwise
      • sendConnect

        protected void sendConnect()
      • newChannelId

        protected org.cometd.bayeux.ChannelId newChannelId​(java.lang.String channelId)
        Specified by:
        newChannelId in class org.cometd.common.AbstractClientSession
      • newChannel

        protected org.cometd.common.AbstractClientSession.AbstractSessionChannel newChannel​(org.cometd.bayeux.ChannelId channelId)
        Specified by:
        newChannel in class org.cometd.common.AbstractClientSession
      • sendBatch

        protected void sendBatch()
        Specified by:
        sendBatch in class org.cometd.common.AbstractClientSession
      • sendMessages

        protected void sendMessages​(java.util.List<org.cometd.bayeux.Message.Mutable> messages,
                                    org.cometd.bayeux.Promise<java.lang.Boolean> promise)
      • disconnect

        public void disconnect​(org.cometd.bayeux.client.ClientSession.MessageListener callback)
        Specified by:
        disconnect in interface org.cometd.bayeux.client.ClientSession
      • disconnect

        public boolean disconnect​(long timeout)

        Performs a disconnect and uses the given timeout to wait for the disconnect to complete.

        When a disconnect is sent to the server, the server also wakes up the long poll that may be outstanding, so that a connect reply message may arrive to the client later than the disconnect reply message.

        This method waits for the given timeout for the disconnect reply, but also waits the same timeout for the last connect reply; in the worst case the maximum time waited will therefore be twice the given timeout parameter.

        This method returns true if the disconnect reply message arrived within the given timeout parameter, no matter if the connect reply message arrived or not.

        Parameters:
        timeout - the timeout to wait for the disconnect to complete
        Returns:
        true if the disconnect completed within the given timeout
      • abort

        public void abort()

        Interrupts abruptly the communication with the Bayeux server.

        This method may be useful to simulate network failures.

        See Also:
        ClientSession.disconnect()
      • messagesFailure

        protected void messagesFailure​(java.lang.Throwable cause,
                                       java.util.List<? extends org.cometd.bayeux.Message> messages)
      • processHandshake

        protected void processHandshake​(org.cometd.bayeux.Message.Mutable handshake)
      • processConnect

        protected void processConnect​(org.cometd.bayeux.Message.Mutable connect)
      • processDisconnect

        protected void processDisconnect​(org.cometd.bayeux.Message.Mutable disconnect)
      • processMessage

        protected void processMessage​(org.cometd.bayeux.Message.Mutable message)
      • scheduleHandshake

        protected boolean scheduleHandshake​(long interval,
                                            long backOff)
      • scheduleConnect

        protected boolean scheduleConnect​(long interval,
                                          long backOff)
      • getAllowedTransports

        public java.util.List<java.lang.String> getAllowedTransports()
        Specified by:
        getAllowedTransports in interface org.cometd.bayeux.Bayeux
      • getKnownTransportNames

        public java.util.Set<java.lang.String> getKnownTransportNames()
        Specified by:
        getKnownTransportNames in interface org.cometd.bayeux.Bayeux
      • getTransport

        public ClientTransport getTransport​(java.lang.String transport)
        Specified by:
        getTransport in interface org.cometd.bayeux.Bayeux
      • initialize

        protected void initialize()
      • terminate

        protected void terminate()
      • getOption

        public java.lang.Object getOption​(java.lang.String qualifiedName)
        Specified by:
        getOption in interface org.cometd.bayeux.Bayeux
      • setOption

        public void setOption​(java.lang.String qualifiedName,
                              java.lang.Object value)
        Specified by:
        setOption in interface org.cometd.bayeux.Bayeux
      • getOptionNames

        public java.util.Set<java.lang.String> getOptionNames()
        Specified by:
        getOptionNames in interface org.cometd.bayeux.Bayeux
      • getOptions

        public java.util.Map<java.lang.String,​java.lang.Object> getOptions()
        Returns:
        the options that configure with BayeuxClient.
      • send

        protected void send​(org.cometd.bayeux.Message.Mutable message)
        Specified by:
        send in class org.cometd.common.AbstractClientSession
      • enqueueSend

        protected void enqueueSend​(org.cometd.bayeux.Message.Mutable message)
      • onSending

        public void onSending​(java.util.List<? extends org.cometd.bayeux.Message> messages)

        Callback method invoked when the given messages have hit the network towards the Bayeux server.

        The messages may not be modified, and any modification will be useless because the message have already been sent.

        Parameters:
        messages - the messages sent
      • onMessages

        public void onMessages​(java.util.List<org.cometd.bayeux.Message.Mutable> messages)

        Callback method invoke when the given messages have just arrived from the Bayeux server.

        The messages may be modified, but it's suggested to use ClientSession.Extensions instead.

        Extensions will be processed after the invocation of this method.

        Parameters:
        messages - the messages arrived
      • onFailure

        public void onFailure​(java.lang.Throwable failure,
                              java.util.List<? extends org.cometd.bayeux.Message> messages)

        Callback method invoked when the given messages have failed to be sent.

        The default implementation logs the failure at DEBUG level.

        Parameters:
        failure - the exception that caused the failure
        messages - the messages being sent
      • onTransportFailure

        protected void onTransportFailure​(java.lang.String oldTransportName,
                                          java.lang.String newTransportName,
                                          java.lang.Throwable failure)
      • toString

        public java.lang.String toString()
        Overrides:
        toString in class java.lang.Object