package org.apache.helix.integration;

/*
 * 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 org.apache.helix.HelixException;
import org.apache.helix.NotificationContext;
import org.apache.helix.mock.participant.MockMSStateModel;
import org.apache.helix.model.ExternalView;
import org.apache.helix.model.IdealState;
import org.apache.helix.model.Message;
import org.apache.helix.model.builder.FullAutoModeISBuilder;
import org.apache.helix.participant.statemachine.StateModel;
import org.apache.helix.participant.statemachine.StateModelFactory;
import org.apache.log4j.Logger;
import org.testng.Assert;
import org.testng.annotations.Test;

public class TestBatchMessageHandling extends ZkStandAloneCMTestBase {

  @Test
  public void testSubMessageFailed() throws InterruptedException {
    TestOnlineOfflineStateModel._numOfSuccessBeforeFail = 6;

    // Let one instance handle all the batch messages.
    _participants[0].getStateMachineEngine().registerStateModelFactory("OnlineOffline",
        new TestOnlineOfflineStateModelFactory(), "TestFactory");
    for (int i = 1; i < _participants.length; i++) {
      _participants[i].syncStop();
    }

    // Add 1 db with batch message enabled. Each db has 10 partitions.
    // So it will have 1 batch message and 10 sub messages.

    String dbName = "TestDBSubMessageFail";
    IdealState idealState = new FullAutoModeISBuilder(dbName).setStateModel("OnlineOffline")
        .setStateModelFactoryName("TestFactory").setNumPartitions(10).setNumReplica(1).build();
    idealState.setBatchMessageMode(true);
    _setupTool.getClusterManagementTool().addResource(CLUSTER_NAME, dbName, idealState);
    _setupTool.rebalanceStorageCluster(CLUSTER_NAME, dbName, 1);

    Thread.sleep(1000L);

    int numOfOnlines = 0;
    int numOfErrors = 0;
    ExternalView externalView =
        _setupTool.getClusterManagementTool().getResourceExternalView(CLUSTER_NAME, dbName);
    for (String partition : externalView.getPartitionSet()) {
      if (externalView.getStateMap(partition).values().contains("ONLINE")) {
        numOfOnlines++;
      }

      if (externalView.getStateMap(partition).values().contains("ERROR")) {
        numOfErrors++;
      }
    }

    Assert.assertEquals(numOfErrors, 4);
    Assert.assertEquals(numOfOnlines, 6);
  }

  public static class TestOnlineOfflineStateModelFactory extends
      StateModelFactory<TestOnlineOfflineStateModel> {
    @Override
    public TestOnlineOfflineStateModel createNewStateModel(String resourceName, String stateUnitKey) {
      TestOnlineOfflineStateModel model = new TestOnlineOfflineStateModel();
      return model;
    }
  }

  public static class TestOnlineOfflineStateModel extends StateModel {
    private static Logger LOG = Logger.getLogger(MockMSStateModel.class);
    public static int _numOfSuccessBeforeFail;

    public synchronized void onBecomeOnlineFromOffline(Message message,
        NotificationContext context) {
      if (_numOfSuccessBeforeFail-- > 0) {
        LOG.info("State transition from Offline to Online");
        return;
      }
      throw new HelixException("Number of Success reached");
    }

    public void onBecomeOfflineFromOnline(Message message, NotificationContext context) {
      LOG.info("State transition from Online to Offline");
    }

    public void onBecomeDroppedFromOffline(Message message, NotificationContext context) {
      LOG.info("State transition from Offline to Dropped");
    }
  }
}
