runtime/org.argeo.slc.detached/src/main/java/org/argeo/slc/detached/drivers/MemoryDriver.java

   1 /*
   2  * Copyright (C) 2010 Mathieu Baudier <mbaudier@argeo.org>
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package org.argeo.slc.detached.drivers;
  18
  19 import org.argeo.slc.detached.DetachedAnswer;
  20 import org.argeo.slc.detached.DetachedClient;
  21 import org.argeo.slc.detached.DetachedDriver;
  22 import org.argeo.slc.detached.DetachedRequest;
  23
  24 /**
  25  * Implements both <code>DetachedClient</code> and <code>DetachedDriver</code>
  26  * using memory access
  27  */
  28 public class MemoryDriver implements DetachedClient, DetachedDriver {
  29         private DetachedRequest currentRequest = null;
  30         private DetachedAnswer currentAnswer = null;
  31
  32         // DRIVER
  33         public synchronized DetachedRequest receiveRequest() throws Exception {
  34                 while (currentRequest == null)
  35                         this.wait(500);
  36                 return currentRequest;
  37         }
  38
  39         public synchronized void sendAnswer(DetachedAnswer answer) throws Exception {
  40                 currentAnswer = answer;
  41                 this.notify();
  42         }
  43
  44         // CLIENT
  45         public synchronized DetachedAnswer receiveAnswer() throws Exception {
  46                 while (currentAnswer == null)
  47                         this.wait(500);
  48                 DetachedAnswer answer = currentAnswer;
  49                 currentAnswer = null;
  50                 currentRequest = null;
  51                 return answer;
  52         }
  53
  54         public synchronized void sendRequest(DetachedRequest request)
  55                         throws Exception {
  56                 currentRequest = request;
  57                 this.notify();
  58         }
  59
  60         public void stop() {
  61                 // NOTHING
  62         }
  63 }