Module org.eclipse.persistence.core

Package org.eclipse.persistence.internal.sessions.coordination

Class CommandPropagator

java.lang.Object

org.eclipse.persistence.internal.sessions.coordination.CommandPropagator

All Implemented Interfaces:

Runnable

public class CommandPropagator
extends Object
implements Runnable

Purpose: Synchronous and asynchronous propagation of remote commands

Description: Maintains a reference to the RemoteCommandManager to obtain the connection information required to send the commands. In sync mode the caller is blocked until the command has been sent along all of the connections. If in async mode then a CommandPropagator instance is further created for each of the connections and control is returned to the caller while the threads send the command to the remote services.

Field Summary

Fields

Modifier and Type	Field	Description
protected Command	command	The command to send
protected byte[]	commandBytes	The command to send
protected RemoteConnection	connection	Connection to send to
protected RemoteCommandManager	rcm	Reference to manager to get connections, etc.

Constructor Summary

Constructors

Constructor	Description
CommandPropagator(RemoteCommandManager rcm, Command command, byte[] commandBytes)	Constructor used to create the main propagator
CommandPropagator(RemoteCommandManager rcm, Command command, byte[] commandBytes, RemoteConnection connection)	Constructor used to create the async propagator threads

Method Summary

Modifier and Type	Method	Description
void	asynchronousPropagateCommand()	INTERNAL: Asynchronously propagate the command
protected Command	getCommand()	INTERNAL: Returns the command to be sent
protected RemoteCommandManager	getRemoteCommandManager()	INTERNAL: Returns the remote command manager
void	handleCommunicationException(RemoteConnection conn, CommunicationException comEx)	INTERNAL: We received the specified CommunicationException trying to execute the command over the specified connection.
void	handleExceptionFromRemoteExecution(RemoteConnection conn, String exString)	INTERNAL: We received the specified exception String while executing the command over the specified connection.
void	propagateCommand(RemoteConnection connection)	INTERNAL: Propagate the command to the specified connection.
void	run()	INTERNAL: This is the execution method of the async propagation thread.
void	synchronousPropagateCommand()	INTERNAL: Synchronously propagate the command

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

rcm

protected RemoteCommandManager rcm

Reference to manager to get connections, etc.

command

protected Command command

The command to send

commandBytes

protected byte[] commandBytes

The command to send

connection

protected RemoteConnection connection

Connection to send to

Constructor Detail

CommandPropagator

public CommandPropagator(RemoteCommandManager rcm,
                         Command command,
                         byte[] commandBytes)

Constructor used to create the main propagator

CommandPropagator

public CommandPropagator(RemoteCommandManager rcm,
                         Command command,
                         byte[] commandBytes,
                         RemoteConnection connection)

Constructor used to create the async propagator threads

Method Detail

getRemoteCommandManager

protected RemoteCommandManager getRemoteCommandManager()

INTERNAL: Returns the remote command manager

getCommand

protected Command getCommand()

INTERNAL: Returns the command to be sent

synchronousPropagateCommand

public void synchronousPropagateCommand()

INTERNAL: Synchronously propagate the command

asynchronousPropagateCommand

public void asynchronousPropagateCommand()

INTERNAL: Asynchronously propagate the command

propagateCommand

public void propagateCommand(RemoteConnection connection)

INTERNAL: Propagate the command to the specified connection.

handleExceptionFromRemoteExecution

public void handleExceptionFromRemoteExecution(RemoteConnection conn,
                                               String exString)

INTERNAL: We received the specified exception String while executing the command over the specified connection. Turn it into a RemoteCommandManagerException and throw it on this, the client side.

handleCommunicationException

public void handleCommunicationException(RemoteConnection conn,
                                         CommunicationException comEx)

INTERNAL: We received the specified CommunicationException trying to execute the command over the specified connection. We treat CommunicationExceptions as the transport-generic wrapper exception that wraps the transport exception, so the real exception that interests us is inside.

run

public void run()

INTERNAL: This is the execution method of the async propagation thread. It will create other threads, one each for the remote connections, to propagate the command.

Specified by:

run in interface Runnable