Package org.eclipse.persistence.sessions.coordination

Class RemoteCommandManager

java.lang.Object
org.eclipse.persistence.sessions.coordination.RemoteCommandManager
All Implemented Interfaces:
CommandManager
public class RemoteCommandManager extends Object implements CommandManager

Purpose: Provide a CommandManager implementation for cache coordination.

Description: A RemoteCommandManager (or RCM) instance is the primary component of an RCM service instance. It manages the other components of the service, and directs the overall service operation. Its ServiceId uniquely distinguishes it from other service instances in the cluster.

Each RCM has a logical channel to which it subscribes and publishes. This channel determines which other instances in the cluster the service instance sends and receives remote commands to/from. All RCM's on the same channel should have the same discovery manager settings (be communicating on the same multicast) so that the discovery managers may be able to discover one another. RCM's on different channels may operate on the same or on different multicast groups.

An RCM instance knows about other instances in the cluster through its DiscoveryManager. Its TransportManager is responsible for setting up the connections to other instances once they are discovered.

An RCM is instructed to "propagate", or execute on all remote service instances in the cluster that subscribe to the same channel, a remote command by its CommandProcessor. Likewise, when an RCM receives a remote command to be executed then it passes the command off to the CommandProcessor for the processing of the command to occur. CommandProcessors pass commands to the RCM as an Object (in a format that may be specific to the application) and the RCM uses its CommandConverter to convert it to a EclipseLink Command object before sending the Command off to the cluster. Similarly, when a EclipseLink Command object is received then the RCM invokes its CommandConverter to convert the object into the application format that will be passed to the CommandProcessor to process the command.

See Also:
Author:
Steven Vo

  • Field Details

    • DEFAULT_CHANNEL

      public static final String DEFAULT_CHANNEL
      See Also:

    • DEFAULT_ASYNCHRONOUS_MODE

      public static final boolean DEFAULT_ASYNCHRONOUS_MODE
      See Also:

    • serviceId

      protected ServiceId serviceId
      Uniquely identifies this service in the cluster

    • discoveryManager

      protected DiscoveryManager discoveryManager
      Manages the detection of new services as they join the cluster

    • transportManager

      protected TransportManager transportManager
      Manages the transport level connections between command managers

    • commandProcessor

      protected CommandProcessor commandProcessor
      Invoked to process a command when it is received from the cluster

    • commandConverter

      protected CommandConverter commandConverter
      Used for converting commands between EclipseLink Command and app command formats

    • isAsynchronous

      protected boolean isAsynchronous
      Determines whether propagation should be synchronous or asynchronous

    • isEclipseLinkSession

      protected boolean isEclipseLinkSession
      Determines whether profiling command should be send

    • serverPlatform

      protected ServerPlatform serverPlatform
      Uniquely identifies ServerPlatform in the cluster

    • serializer

      protected Serializer serializer
      Set the Serializer to use for serialization of commands.

    • isStopped

      protected boolean isStopped

  • Constructor Details

  • Method Details

    • initialize

      public void initialize()
      PUBLIC: Initialize the remote command manager. This will also trigger the DiscoveryManager to start establishing the EclipseLink cluster.
      Specified by:
      initialize in interface CommandManager

    • isStopped

      public boolean isStopped()
      PUBLIC: Indicates whether the RCM has been stopped: either initialize hasn't been called or shutdown has been called.

    • shutdown

      public void shutdown()
      PUBLIC: Shut down the remote command manager. This will also trigger the DiscoveryManager to stop. NOTE: Although this call initiates the shutdown process, no guarantees are made as to when it will actually complete.
      Specified by:
      shutdown in interface CommandManager

    • propagateCommand

      public void propagateCommand(Object command)
      ADVANCED: Propagate a remote command to all remote RCM services participating in the EclipseLink cluster.
      Specified by:
      propagateCommand in interface CommandManager
      Parameters:
      command - An object representing a EclipseLink command

    • processCommandFromRemoteConnection

      public void processCommandFromRemoteConnection(byte[] commandBytes)
      INTERNAL: Deserialize the command and execute it.

    • processCommandFromRemoteConnection

      public void processCommandFromRemoteConnection(Command command)
      INTERNAL: Delegate to command processor

    • getCommandProcessor

      public CommandProcessor getCommandProcessor()
      Description copied from interface: CommandManager
      PUBLIC: Return the command processor that processes commands received from the cluster.
      Specified by:
      getCommandProcessor in interface CommandManager
      Returns:
      An implementation instance of CommandProcessor

    • setCommandProcessor

      public void setCommandProcessor(CommandProcessor newCommandProcessor)
      Description copied from interface: CommandManager
      ADVANCED: Set the command processor that will be invoked to process commands. EclipseLink applications can implement this interface in order to receive remote commands from a EclipseLink cluster.
      Specified by:
      setCommandProcessor in interface CommandManager
      Parameters:
      newCommandProcessor - The intended processor of remote commands

    • getTransportManager

      public TransportManager getTransportManager()
      Description copied from interface: CommandManager
      PUBLIC: Return the transport manager that manages sending and receiving of remote commands.
      Specified by:
      getTransportManager in interface CommandManager
      Returns:
      The TransportManager instance being used by this CommandManager

    • setTransportManager

      public void setTransportManager(TransportManager newTransportManager)
      Description copied from interface: CommandManager
      ADVANCED: Set a specific transport manager to manage sending and receiving of remote commands.
      Specified by:
      setTransportManager in interface CommandManager
      Parameters:
      newTransportManager - An instance of the desired transport manager type

    • handleException

      public void handleException(RuntimeException exception)
      INTERNAL: Delegate to the command procesor to handle the exception.

    • newServiceDiscovered

      public void newServiceDiscovered(ServiceId service)
      INTERNAL: A new service has been detected by the discovery manager. Take the appropriate action to connect to the service.

    • getDiscoveryManager

      public DiscoveryManager getDiscoveryManager()
      PUBLIC: Return the discovery manager that detects the arrival of new cluster members
      Specified by:
      getDiscoveryManager in interface CommandManager
      Returns:
      The DiscoveryManager instance being used by this CommandManager

    • getCommandConverter

      public CommandConverter getCommandConverter()
      PUBLIC: Return the converter instance used to convert between EclipseLink Command objects and an application command format.
      Specified by:
      getCommandConverter in interface CommandManager
      Returns:
      The converter being used by this CommandManager

    • setCommandConverter

      public void setCommandConverter(CommandConverter newCommandConverter)
      ADVANCED: Set the converter instance that will be invoked by this CommandProcessor to convert commands from their application command format into EclipseLink Command objects before being propagated to remote command manager services. The converter will also be invoked to convert EclipseLink Command objects into application format before being sent to the CommandProcessor for execution.
      Specified by:
      setCommandConverter in interface CommandManager
      Parameters:
      newCommandConverter - The converter to be used by this CommandManager

    • shouldLogMessage

      public boolean shouldLogMessage(int logLevel)
      INTERNAL:

    • shouldLogDebugMessage

      public boolean shouldLogDebugMessage()

    • shouldLogWarningMessage

      public boolean shouldLogWarningMessage()

    • logMessage

      public void logMessage(int logLevel, String message, Object[] args)
      INTERNAL:

    • logMessageWithoutLevelCheck

      public void logMessageWithoutLevelCheck(int logLevel, String message, Object[] args)
      INTERNAL: Use this method in case the necessary logLevel has been confirmed by calling commandProcessor.shouldLogMessages method

    • logDebug

      public void logDebug(String message, Object[] args)
      INTERNAL: Convenience logging methods.

    • logDebugWithoutLevelCheck

      public void logDebugWithoutLevelCheck(String message, Object[] args)

    • logInfo

      public void logInfo(String message, Object[] args)

    • logWarning

      public void logWarning(String message, Object[] args)

    • logWarningWithoutLevelCheck

      public void logWarningWithoutLevelCheck(String message, Object[] args)

    • logError

      public void logError(String message, Object[] args)

    • getServiceId

      public ServiceId getServiceId()
      INTERNAL: Return the service info that identifies this service instance

    • getChannel

      public String getChannel()
      PUBLIC: Return the service channel for this command manager. All command managers with the same service channel will send and receive commands from each other. Commands sent on other service channels will not be exchanged with this command manager.
      Specified by:
      getChannel in interface CommandManager
      Returns:
      The service channel String subscribed to by this CommandManager

    • setChannel

      public void setChannel(String channel)
      ADVANCED: Set the service channel for this command manager. All command managers with the same service channel will send and receive commands from each other. Commands sent on other service channels will not be exchanged with this command manager.
      Specified by:
      setChannel in interface CommandManager
      Parameters:
      channel - The service channel subscribed to by this CommandManager

    • isCommandProcessorASession

      public boolean isCommandProcessorASession()
      INTERNAL: Return whether this command manager should process profile commands
      Specified by:
      isCommandProcessorASession in interface CommandManager

    • getUrl

      public String getUrl()
      PUBLIC: Return the URL for this command manager.
      Specified by:
      getUrl in interface CommandManager
      Returns:
      The URL String for this CommandManager

    • setUrl

      public void setUrl(String url)
      ADVANCED: Set the URL for this command manager.
      Specified by:
      setUrl in interface CommandManager
      Parameters:
      url - The URL String for this CommandManager

    • shouldPropagateAsynchronously

      public boolean shouldPropagateAsynchronously()
      PUBLIC: Return whether this command manager should propagate commands synchronously or asynchronously. If set to synchronous propagation then propagateCommand() will not return to the caller until the command has been executed on all of the services in the cluster. In asynchronous mode the command manager will create a separate thread for each of the remote service executions, and then promptly return to the caller.
      Specified by:
      shouldPropagateAsynchronously in interface CommandManager

    • setShouldPropagateAsynchronously

      public void setShouldPropagateAsynchronously(boolean asyncMode)
      ADVANCED: Set whether this command manager should propagate commands synchronously or asynchronously. If set to synchronous propagation then propagateCommand() will not return to the caller until the command has been executed on all of the services in the cluster. In asynchronous mode the command manager will create a separate thread for each of the remote service executions, and then promptly return to the caller.
      Specified by:
      setShouldPropagateAsynchronously in interface CommandManager

    • replaceLocalHostIPAddress

      public void replaceLocalHostIPAddress(String ipAddress)
      ADVANCED: Allow user to replace the $HOST subString of the local host URL with the user user input at runtime. By default, EclipseLink will try to discovery the local host IP and may fail due to security or network restrictions. In this case, user can call this API to specify the IP address or host name during pre-login session event or before session login. Example: If input is 145.23.127.79, the local host URL of ormi://$HOST:2971:/app_name will become ormi://145.23.127.79:2971:/app_name

    • replaceTransportPortNumber

      public void replaceTransportPortNumber(String portNumber)
      ADVANCED: Allow user to replace the $PORT subString of the local host URL with the user user input at runtime. In this case, user can call this API to specify the port number for a specific transport during pre-login session event or before session login. Example: If input is 7799, the local host URL of ormi://145.23.127.79:$PORT/app_name will become ormi://145.23.127.79:7799/app_name

    • getServerPlatform

      public ServerPlatform getServerPlatform()
      INTERNAL: Return the serverPlatform that identifies the application server

    • setServerPlatform

      public void setServerPlatform(ServerPlatform theServerPlatform)
      PUBLIC: The ServerPlatform must be set manually when the RemoteCommandManager'CommandProcessor is not EclipseLink Session. When the CommandProcessor is a EclipseLink Session, the ServerPlatform is automatically gotten from the Session.

    • getSerializer

      public Serializer getSerializer()
      PUBLIC: Return the Serializer to use for serialization of commands.

    • setSerializer

      public void setSerializer(Serializer serializer)
      PUBLIC: Set the Serializer to use for serialization of commands.