org.jgroups.blocks
Class RpcDispatcher

java.lang.Object
  org.jgroups.blocks.MessageDispatcher
      org.jgroups.blocks.RpcDispatcher

All Implemented Interfaces:

RequestHandler, ChannelListener

Direct Known Subclasses:

MuxRpcDispatcher

public class RpcDispatcher
extends MessageDispatcher

This class allows a programmer to invoke remote methods in all (or single) group members and optionally wait for the return value(s). An application will typically create a channel and layer the RpcDispatcher building block on top of it, which allows it to dispatch remote methods (client role) and at the same time be called by other members (server role). This class is derived from MessageDispatcher. Is the equivalent of RpcProtocol on the application rather than protocol level.

Author:

Bela Ban

Nested Class Summary

static interface

RpcDispatcher.Marshaller

Field Summary

protected MethodLookup	method_lookup
protected RpcDispatcher.Marshaller	req_marshaller Marshaller to marshall requests at the caller and unmarshal requests at the receiver(s)
protected RpcDispatcher.Marshaller	rsp_marshaller Marshaller to marshal responses at the receiver(s) and unmarshal responses at the caller
protected java.lang.Object	server_obj

Fields inherited from class org.jgroups.blocks.MessageDispatcher

async_anycasts, async_multicasts, async_unicasts, channel, channel_listeners, corr, hardware_multicast_supported, local_addr, log, members, membership_listener, msg_listener, probe_handler, prot_adapter, req_handler, sync_anycasts, sync_multicasts, sync_unicasts

Constructor Summary

RpcDispatcher()

RpcDispatcher(Channel channel, MessageListener l, MembershipListener l2, java.lang.Object server_obj)

RpcDispatcher(Channel channel, java.lang.Object server_obj)

Method Summary

<T> T	callRemoteMethod(Address dest, MethodCall call, RequestOptions options) Invokes a method in a cluster member and - if blocking - returns the result
<T> T	callRemoteMethod(Address dest, java.lang.String method_name, java.lang.Object[] args, java.lang.Class[] types, RequestOptions options) Invokes a method in a cluster member and - if blocking - returns the result
<T> RspList<T>	callRemoteMethods(java.util.Collection<Address> dests, MethodCall method_call, RequestOptions options) Invokes a method in all members and expects responses from members contained in dests (or all members if dests is null).
<T> RspList<T>	callRemoteMethods(java.util.Collection<Address> dests, java.lang.String method_name, java.lang.Object[] args, java.lang.Class[] types, RequestOptions options) Invokes a method in all members and expects responses from members contained in dests (or all members if dests is null).
<T> NotifyingFuture<RspList<T>>	callRemoteMethodsWithFuture(java.util.Collection<Address> dests, MethodCall method_call, RequestOptions options) Invokes a method in all members and expects responses from members contained in dests (or all members if dests is null).
<T> NotifyingFuture<T>	callRemoteMethodWithFuture(Address dest, MethodCall call, RequestOptions options) Invokes a method in a cluster member and - if blocking - returns the result
protected void	correlatorStarted()
RpcDispatcher.Marshaller	getMarshaller()
MethodLookup	getMethodLookup()
static java.lang.String	getName()
RpcDispatcher.Marshaller	getRequestMarshaller()
RpcDispatcher.Marshaller	getResponseMarshaller()
java.lang.Object	getServerObject()
java.lang.Object	handle(Message req) Message contains MethodCall.
void	setMarshaller(RpcDispatcher.Marshaller m)
void	setMethodLookup(MethodLookup method_lookup)
void	setRequestMarshaller(RpcDispatcher.Marshaller m)
void	setResponseMarshaller(RpcDispatcher.Marshaller m)
void	setServerObject(java.lang.Object server_obj)

Methods inherited from class org.jgroups.blocks.MessageDispatcher

addChannelListener, cast, castMessage, castMessageWithFuture, channelClosed, channelConnected, channelDisconnected, createRequestCorrelator, done, getChannel, getMessageListener, getProtocolAdapter, handleUpEvent, installUpHandler, removeChannelListener, sendMessage, sendMessageWithFuture, setChannel, setMembers, setMembershipListener, setMessageListener, setRequestHandler, start, stop

Methods inherited from class java.lang.Object

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

Field Detail

server_obj

protected java.lang.Object server_obj

req_marshaller

protected RpcDispatcher.Marshaller req_marshaller

Marshaller to marshall requests at the caller and unmarshal requests at the receiver(s)

rsp_marshaller

protected RpcDispatcher.Marshaller rsp_marshaller

Marshaller to marshal responses at the receiver(s) and unmarshal responses at the caller

method_lookup

protected MethodLookup method_lookup

Constructor Detail

RpcDispatcher

public RpcDispatcher()

RpcDispatcher

public RpcDispatcher(Channel channel,
                     MessageListener l,
                     MembershipListener l2,
                     java.lang.Object server_obj)

RpcDispatcher

public RpcDispatcher(Channel channel,
                     java.lang.Object server_obj)

Method Detail

getName

public static java.lang.String getName()

getRequestMarshaller

public RpcDispatcher.Marshaller getRequestMarshaller()

setRequestMarshaller

public void setRequestMarshaller(RpcDispatcher.Marshaller m)

getResponseMarshaller

public RpcDispatcher.Marshaller getResponseMarshaller()

setResponseMarshaller

public void setResponseMarshaller(RpcDispatcher.Marshaller m)

getMarshaller

public RpcDispatcher.Marshaller getMarshaller()

setMarshaller

public void setMarshaller(RpcDispatcher.Marshaller m)

getServerObject

public java.lang.Object getServerObject()

setServerObject

public void setServerObject(java.lang.Object server_obj)

getMethodLookup

public MethodLookup getMethodLookup()

setMethodLookup

public void setMethodLookup(MethodLookup method_lookup)

callRemoteMethods

public <T> RspList<T> callRemoteMethods(java.util.Collection<Address> dests,
                                        java.lang.String method_name,
                                        java.lang.Object[] args,
                                        java.lang.Class[] types,
                                        RequestOptions options)
                             throws java.lang.Exception

Invokes a method in all members and expects responses from members contained in dests (or all members if dests is null).

Parameters:

dests - A list of addresses. If null, we'll wait for responses from all cluster members

method_name - The name of the target method

args - The arguments to be passed

types - The types of the arguments

options - A collection of call options, e.g. sync versus async, timeout etc

Returns:

RspList A response list with results, one for each member in dests

Throws:

java.lang.Exception - If the sending of the message threw an exception. Note that no exception will be thrown if any of the target members threw an exception, but this exception will be in the Rsp object for the particular member in the RspList

callRemoteMethods

public <T> RspList<T> callRemoteMethods(java.util.Collection<Address> dests,
                                        MethodCall method_call,
                                        RequestOptions options)
                             throws java.lang.Exception

Invokes a method in all members and expects responses from members contained in dests (or all members if dests is null).

Parameters:

dests - A list of addresses. If null, we'll wait for responses from all cluster members

method_call - The method (plus args) to be invoked

options - A collection of call options, e.g. sync versus async, timeout etc

Returns:

RspList A list of return values and flags (suspected, not received) per member

Throws:

java.lang.Exception - If the sending of the message threw an exception. Note that no exception will be thrown if any of the target members threw an exception, but this exception will be in the Rsp object for the particular member in the RspList

Since:

2.9

callRemoteMethodsWithFuture

public <T> NotifyingFuture<RspList<T>> callRemoteMethodsWithFuture(java.util.Collection<Address> dests,
                                                                   MethodCall method_call,
                                                                   RequestOptions options)
                                                        throws java.lang.Exception

Invokes a method in all members and expects responses from members contained in dests (or all members if dests is null).

Parameters:

dests - A list of addresses. If null, we'll wait for responses from all cluster members

method_call - The method (plus args) to be invoked

options - A collection of call options, e.g. sync versus async, timeout etc

Returns:

NotifyingFuture A future from which the results can be fetched

Throws:

java.lang.Exception - If the sending of the message threw an exception. Note that no exception will be thrown if any of the target members threw an exception; such an exception will be in the Rsp element for the particular member in the RspList

callRemoteMethod

public <T> T callRemoteMethod(Address dest,
                              java.lang.String method_name,
                              java.lang.Object[] args,
                              java.lang.Class[] types,
                              RequestOptions options)
                   throws java.lang.Exception

Invokes a method in a cluster member and - if blocking - returns the result

Parameters:

dest - The target member on which to invoke the method

method_name - The name of the method

args - The arguments

types - The types of the arguments

options - The options (e.g. blocking, timeout etc)

Returns:

The result

Throws:

java.lang.Exception - Thrown if the method invocation threw an exception, either at the caller or the callee

callRemoteMethod

public <T> T callRemoteMethod(Address dest,
                              MethodCall call,
                              RequestOptions options)
                   throws java.lang.Exception

Invokes a method in a cluster member and - if blocking - returns the result

Parameters:

dest - The target member on which to invoke the method

call - The call to be invoked, including method are arguments

options - The options (e.g. blocking, timeout etc)

Returns:

The result

Throws:

java.lang.Exception - Thrown if the method invocation threw an exception, either at the caller or the callee

callRemoteMethodWithFuture

public <T> NotifyingFuture<T> callRemoteMethodWithFuture(Address dest,
                                                         MethodCall call,
                                                         RequestOptions options)
                                              throws java.lang.Exception

Invokes a method in a cluster member and - if blocking - returns the result

Parameters:

dest - The target member on which to invoke the method

call - The call to be invoked, including method are arguments

options - The options (e.g. blocking, timeout etc)

Returns:

A future from which the result can be fetched. If the callee threw an invocation, an ExecutionException will be thrown on calling Future.get().

Throws:

java.lang.Exception - Thrown if the method invocation threw an exception

correlatorStarted

protected void correlatorStarted()

Overrides:

correlatorStarted in class MessageDispatcher

handle

public java.lang.Object handle(Message req)
                        throws java.lang.Exception

Message contains MethodCall. Execute it against *this* object and return result. Use MethodCall.invoke() to do this. Return result.

Specified by:

handle in interface RequestHandler

Overrides:

handle in class MessageDispatcher

Throws:

java.lang.Exception