| /* |
| * Copyright 2009-2013 by The Regents of the University of California |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * you may obtain a copy of the License from |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package edu.uci.ics.hyracks.ipc.api; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| public class RPCInterface implements IIPCI { |
| private final Map<Long, Request> reqMap; |
| |
| public RPCInterface() { |
| reqMap = new HashMap<Long, RPCInterface.Request>(); |
| } |
| |
| public Object call(IIPCHandle handle, Object request) throws Exception { |
| Request req; |
| synchronized (this) { |
| req = new Request(); |
| long mid = handle.send(-1, request, null); |
| reqMap.put(mid, req); |
| } |
| return req.getResponse(); |
| } |
| |
| @Override |
| public void deliverIncomingMessage(IIPCHandle handle, long mid, long rmid, Object payload, Exception exception) { |
| Request req; |
| synchronized (this) { |
| req = reqMap.remove(rmid); |
| } |
| assert req != null; |
| if (exception != null) { |
| req.setException(exception); |
| } else { |
| req.setResult(payload); |
| } |
| } |
| |
| private static class Request { |
| private boolean pending; |
| |
| private Object result; |
| |
| private Exception exception; |
| |
| Request() { |
| pending = true; |
| result = null; |
| exception = null; |
| } |
| |
| synchronized void setResult(Object result) { |
| this.pending = false; |
| this.result = result; |
| notifyAll(); |
| } |
| |
| synchronized void setException(Exception exception) { |
| this.pending = false; |
| this.exception = exception; |
| notifyAll(); |
| } |
| |
| synchronized Object getResponse() throws Exception { |
| while (pending) { |
| wait(); |
| } |
| if (exception != null) { |
| throw exception; |
| } |
| return result; |
| } |
| } |
| } |