/*
    * 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.
   */
  
  package org.apache.giraph.comm;
  
  import com.google.common.collect.Lists;
  import org.apache.giraph.comm.netty.NettyClient;
  import org.apache.giraph.comm.netty.NettyServer;
  import org.apache.giraph.comm.netty.handler.RequestServerHandler;
  import org.apache.giraph.comm.netty.handler.WorkerRequestServerHandler;
  import org.apache.giraph.conf.GiraphConfiguration;
  import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;
  import org.apache.giraph.utils.IntNoOpComputation;
  import org.apache.giraph.utils.MockUtils;
  import org.apache.giraph.worker.WorkerInfo;
  import org.apache.hadoop.io.IntWritable;
  import org.apache.hadoop.mapreduce.Mapper.Context;
  import org.junit.Before;
  import org.junit.Test;
  
  import java.io.IOException;
  import java.util.List;
  
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  
  /**
   * Test the netty connections
   */
  public class ConnectionTest {
    /** Class configuration */
    private ImmutableClassesGiraphConfiguration conf;
  
    @Before
    public void setUp() {
      GiraphConfiguration tmpConfig = new GiraphConfiguration();
      tmpConfig.setComputationClass(IntNoOpComputation.class);
      conf = new ImmutableClassesGiraphConfiguration(tmpConfig);
    }
  
    /**
     * Test connecting a single client to a single server.
     *
     * @throws IOException
     */
    @Test
    public void connectSingleClientServer() throws IOException {
      @SuppressWarnings("rawtypes")
      Context context = mock(Context.class);
      when(context.getConfiguration()).thenReturn(conf);
  
      ServerData<IntWritable, IntWritable, IntWritable> serverData =
          MockUtils.createNewServerData(conf, context);
      WorkerInfo workerInfo = new WorkerInfo();
      NettyServer server =
          new NettyServer(conf,
              new WorkerRequestServerHandler.Factory(serverData), workerInfo,
              context, new MockExceptionHandler());
      server.start();
      workerInfo.setInetSocketAddress(server.getMyAddress(), server.getLocalHostOrIp());
  
      NettyClient client = new NettyClient(context, conf, new WorkerInfo(),
          new MockExceptionHandler());
      server.setFlowControl(client.getFlowControl());
      client.connectAllAddresses(
          Lists.<WorkerInfo>newArrayList(workerInfo));
  
      client.stop();
      server.stop();
    }
  
    /**
     * Test connecting one client to three servers.
     *
     * @throws IOException
     */
    @Test
    public void connectOneClientToThreeServers() throws IOException {
      @SuppressWarnings("rawtypes")
      Context context = mock(Context.class);
      when(context.getConfiguration()).thenReturn(conf);
  
      ServerData<IntWritable, IntWritable, IntWritable> serverData =
          MockUtils.createNewServerData(conf, context);
    RequestServerHandler.Factory requestServerHandlerFactory =
        new WorkerRequestServerHandler.Factory(serverData);
 
     WorkerInfo workerInfo1 = new WorkerInfo();
     workerInfo1.setTaskId(1);
     NettyServer server1 =
         new NettyServer(conf, requestServerHandlerFactory, workerInfo1,
             context, new MockExceptionHandler());
     server1.start();
     workerInfo1.setInetSocketAddress(server1.getMyAddress(), server1.getLocalHostOrIp());
 
     WorkerInfo workerInfo2 = new WorkerInfo();
     workerInfo1.setTaskId(2);
     NettyServer server2 =
         new NettyServer(conf, requestServerHandlerFactory, workerInfo2,
             context, new MockExceptionHandler());
     server2.start();
     workerInfo2.setInetSocketAddress(server2.getMyAddress(), server1.getLocalHostOrIp());
 
     WorkerInfo workerInfo3 = new WorkerInfo();
     workerInfo1.setTaskId(3);
     NettyServer server3 =
         new NettyServer(conf, requestServerHandlerFactory, workerInfo3,
             context, new MockExceptionHandler());
     server3.start();
     workerInfo3.setInetSocketAddress(server3.getMyAddress(), server1.getLocalHostOrIp());
 
     NettyClient client = new NettyClient(context, conf, new WorkerInfo(),
         new MockExceptionHandler());
     server1.setFlowControl(client.getFlowControl());
     server2.setFlowControl(client.getFlowControl());
     server3.setFlowControl(client.getFlowControl());
     List<WorkerInfo> addresses = Lists.<WorkerInfo>newArrayList(workerInfo1,
         workerInfo2, workerInfo3);
     client.connectAllAddresses(addresses);
 
     client.stop();
     server1.stop();
     server2.stop();
     server3.stop();
   }
 
   /**
    * Test connecting three clients to one server.
    *
    * @throws IOException
    */
   @Test
   public void connectThreeClientsToOneServer() throws IOException {
     @SuppressWarnings("rawtypes")
     Context context = mock(Context.class);
     when(context.getConfiguration()).thenReturn(conf);
 
     ServerData<IntWritable, IntWritable, IntWritable> serverData =
         MockUtils.createNewServerData(conf, context);
     WorkerInfo workerInfo = new WorkerInfo();
     NettyServer server = new NettyServer(conf,
         new WorkerRequestServerHandler.Factory(serverData), workerInfo,
             context, new MockExceptionHandler());
     server.start();
     workerInfo.setInetSocketAddress(server.getMyAddress(), server.getLocalHostOrIp());
 
     List<WorkerInfo> addresses = Lists.<WorkerInfo>newArrayList(workerInfo);
     NettyClient client1 = new NettyClient(context, conf, new WorkerInfo(),
         new MockExceptionHandler());
     client1.connectAllAddresses(addresses);
     NettyClient client2 = new NettyClient(context, conf, new WorkerInfo(),
         new MockExceptionHandler());
     client2.connectAllAddresses(addresses);
     NettyClient client3 = new NettyClient(context, conf, new WorkerInfo(),
         new MockExceptionHandler());
     client3.connectAllAddresses(addresses);
     server.setFlowControl(client1.getFlowControl());
 
     client1.stop();
     client2.stop();
     client3.stop();
     server.stop();
   }
 }