org.exoplatform.services.rpc

Interface RPCService

All Known Implementing Classes:

AbstractRPCService, RPCServiceImpl

public interface RPCService

This service provides mechanism to communicate with the other cluster nodes. This service will be based of JGroups as an underlying Transport.

Version:

$Id$

Author:

Nicolas Filotto

Field Summary

Fields

Modifier and Type	Field and Description
static RuntimePermission	ACCESS_RPC_SERVICE_PERMISSION The permission needed to access to any methods of the RPCService

Method Summary

Modifier and Type	Method and Description
List<Object>	executeCommandOnAllNodes(RemoteCommand command, boolean synchronous, Serializable... args) Executes a command on all the cluster nodes.
List<Object>	executeCommandOnAllNodes(RemoteCommand command, long timeout, Serializable... args) Executes a command synchronously on all the cluster nodes.
Object	executeCommandOnCoordinator(RemoteCommand command, boolean synchronous, Serializable... args) Executes a command on the coordinator only.
Object	executeCommandOnCoordinator(RemoteCommand command, long timeout, Serializable... args) Executes a command synchronously on the coordinator only.
boolean	isCoordinator() Indicates whether the local node is the coordinator of the cluster
RemoteCommand	registerCommand(RemoteCommand command) Register a new RemoteCommand instance, it will be mapped to its id.
void	registerTopologyChangeListener(TopologyChangeListener listener) Register a new TopologyChangeListener
void	unregisterCommand(RemoteCommand command) Unregister a RemoteCommand instance, if the id is known or the instance itself is known otherwise it will be ignored
void	unregisterTopologyChangeListener(TopologyChangeListener listener) Unregister a TopologyChangeListener if it exists

Field Detail

ACCESS_RPC_SERVICE_PERMISSION

static final RuntimePermission ACCESS_RPC_SERVICE_PERMISSION

The permission needed to access to any methods of the RPCService

Method Detail

executeCommandOnAllNodes

List<Object> executeCommandOnAllNodes(RemoteCommand command,
                                      boolean synchronous,
                                      Serializable... args)
                               throws RPCException,
                                      SecurityException

Executes a command on all the cluster nodes. This method is equivalent to the other method of the same type but with the default timeout. The command must be registered first otherwise an RPCException will be thrown.

Parameters:

command - The command to execute on each cluster node

synchronous - if true, sets group request mode to org.jgroups.blocks.GroupRequest#GET_ALL, and if false sets it to org.jgroups.blocks.GroupRequest#GET_NONE.

args - an array of Serializable objects corresponding to parameters of the command to execute remotely

Returns:

a list of responses from all the members of the cluster. If we met an exception on a given node, the RPCException will be the corresponding response of this particular node

Throws:

RPCException - in the event of problems.

SecurityException - if the SecurityManager is installed and the call method doesn't have the RuntimePermission ACCESS_RPC_SERVICE_PERMISSION

executeCommandOnAllNodes

List<Object> executeCommandOnAllNodes(RemoteCommand command,
                                      long timeout,
                                      Serializable... args)
                               throws RPCException,
                                      SecurityException

Executes a command synchronously on all the cluster nodes. The command must be registered first otherwise an RPCException will be thrown.

Parameters:

command - The command to execute on each cluster node

timeout - a timeout after which to throw a replication exception.

args - an array of Serializable objects corresponding to parameters of the command to execute remotely

Returns:

a list of responses from all the members of the cluster. If we met an exception on a given node, the RPCException will be the corresponding response of this particular node

Throws:

RPCException - in the event of problems.

SecurityException - if the SecurityManager is installed and the call method doesn't have the RuntimePermission ACCESS_RPC_SERVICE_PERMISSION

executeCommandOnCoordinator

Object executeCommandOnCoordinator(RemoteCommand command,
                                   boolean synchronous,
                                   Serializable... args)
                            throws RPCException,
                                   SecurityException

Executes a command on the coordinator only. This method is equivalent to the other method of the same type but with the default timeout. The command must be registered first otherwise an RPCException will be thrown.

Parameters:

command - The command to execute on the coordinator node

synchronous - if true, sets group request mode to org.jgroups.blocks.GroupRequest#GET_ALL, and if false sets it to org.jgroups.blocks.GroupRequest#GET_NONE.

args - an array of Serializable objects corresponding to parameters of the command to execute remotely

Returns:

the response of the coordinator.

Throws:

RPCException - in the event of problems.

SecurityException - if the SecurityManager is installed and the call method doesn't have the RuntimePermission ACCESS_RPC_SERVICE_PERMISSION

executeCommandOnCoordinator

Object executeCommandOnCoordinator(RemoteCommand command,
                                   long timeout,
                                   Serializable... args)
                            throws RPCException,
                                   SecurityException

Executes a command synchronously on the coordinator only. The command must be registered first otherwise an RPCException will be thrown.

Parameters:

command - The command to execute on the coordinator node

timeout - a timeout after which to throw a replication exception.

args - an array of Serializable objects corresponding to parameters of the command to execute remotely

Returns:

the response of the coordinator.

Throws:

RPCException - in the event of problems.

SecurityException - if the SecurityManager is installed and the call method doesn't have the RuntimePermission ACCESS_RPC_SERVICE_PERMISSION

registerCommand

RemoteCommand registerCommand(RemoteCommand command)
                       throws SecurityException

Register a new RemoteCommand instance, it will be mapped to its id. If a command with the same Id has already been registered, a warning will be printed into the log file and the new command will replace the old one.

Parameters:

command - the instance of the RemoteCommand to register

Returns:

the command itself if it could be registered null otherwise

Throws:

SecurityException - if the SecurityManager is installed and the call method doesn't have the RuntimePermission ACCESS_RPC_SERVICE_PERMISSION

unregisterCommand

void unregisterCommand(RemoteCommand command)
                throws SecurityException

Unregister a RemoteCommand instance, if the id is known or the instance itself is known otherwise it will be ignored

Parameters:

command - the command to unregister

Throws:

SecurityException - if the SecurityManager is installed and the call method doesn't have the RuntimePermission ACCESS_RPC_SERVICE_PERMISSION

isCoordinator

boolean isCoordinator()
               throws RPCException

Indicates whether the local node is the coordinator of the cluster

Returns:

true if the coordinator is the coordinator, false otherwise throws RPCException in case the RPCService is in an illegal state

Throws:

RPCException

registerTopologyChangeListener

void registerTopologyChangeListener(TopologyChangeListener listener)
                             throws SecurityException

Register a new TopologyChangeListener

Parameters:

listener - the listener to be registered

Throws:

SecurityException - if the SecurityManager is installed and the call method doesn't have the RuntimePermission ACCESS_RPC_SERVICE_PERMISSION

unregisterTopologyChangeListener

void unregisterTopologyChangeListener(TopologyChangeListener listener)
                               throws SecurityException

Unregister a TopologyChangeListener if it exists

Parameters:

listener - the listener to unregister

Throws:

SecurityException - if the SecurityManager is installed and the call method doesn't have the RuntimePermission ACCESS_RPC_SERVICE_PERMISSION