helix-core/src/test/java/org/apache/helix/messaging/TestAsyncCallback.java

package org.apache.helix.messaging;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 at
 *
 *     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.
 */

import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.UUID;

import org.apache.helix.model.Message;
import org.testng.AssertJUnit;
import org.testng.annotations.Test;

public class TestAsyncCallback {
  class AsyncCallbackSample extends AsyncCallback {
    int _onTimeOutCalled = 0;
    int _onReplyMessageCalled = 0;

    @Override
    public void onTimeOut() {
      // TODO Auto-generated method stub
      _onTimeOutCalled++;
    }

    @Override
    public void onReplyMessage(Message message) {
      _onReplyMessageCalled++;
    }
  }

  @Test()
  public void testAsyncCallback() throws Exception {
    System.out.println("START TestAsyncCallback at " + new Date(System.currentTimeMillis()));
    AsyncCallbackSample callback = new AsyncCallbackSample();
    AssertJUnit.assertFalse(callback.isInterrupted());
    AssertJUnit.assertFalse(callback.isTimedOut());
    AssertJUnit.assertTrue(callback.getMessageReplied().size() == 0);

    int nMsgs = 5;

    List<Message> messageSent = new ArrayList<Message>();
    for (int i = 0; i < nMsgs; i++) {
      messageSent.add(new Message("Test", UUID.randomUUID().toString()));
    }

    callback.setMessagesSent(messageSent);

    for (int i = 0; i < nMsgs; i++) {
      AssertJUnit.assertFalse(callback.isDone());
      callback.onReply(new Message("TestReply", UUID.randomUUID().toString()));
    }
    AssertJUnit.assertTrue(callback.isDone());

    AssertJUnit.assertTrue(callback._onTimeOutCalled == 0);

    sleep(50);
    callback = new AsyncCallbackSample();
    callback.setMessagesSent(messageSent);
    callback.setTimeout(1000);
    sleep(50);
    callback.startTimer();
    AssertJUnit.assertFalse(callback.isTimedOut());
    for (int i = 0; i < nMsgs - 1; i++) {
      sleep(50);
      AssertJUnit.assertFalse(callback.isDone());
      AssertJUnit.assertTrue(callback._onReplyMessageCalled == i);
      callback.onReply(new Message("TestReply", UUID.randomUUID().toString()));
    }
    sleep(1000);
    AssertJUnit.assertTrue(callback.isTimedOut());
    AssertJUnit.assertTrue(callback._onTimeOutCalled == 1);
    AssertJUnit.assertFalse(callback.isDone());

    callback = new AsyncCallbackSample();
    callback.setMessagesSent(messageSent);
    callback.setTimeout(1000);
    callback.startTimer();
    sleep(50);
    AssertJUnit.assertFalse(callback.isTimedOut());
    for (int i = 0; i < nMsgs; i++) {
      AssertJUnit.assertFalse(callback.isDone());
      sleep(50);
      AssertJUnit.assertTrue(callback._onReplyMessageCalled == i);
      callback.onReply(new Message("TestReply", UUID.randomUUID().toString()));
    }
    AssertJUnit.assertTrue(callback.isDone());
    sleep(1300);
    AssertJUnit.assertFalse(callback.isTimedOut());
    AssertJUnit.assertTrue(callback._onTimeOutCalled == 0);
    System.out.println("END TestAsyncCallback at " + new Date(System.currentTimeMillis()));
  }

  void sleep(int time) {
    try {
      Thread.sleep(time);
    } catch (Exception e) {
      System.out.println(e);
    }
  }
}