exec/java-exec/src/main/java/org/apache/drill/exec/rpc/data/DataClientConnection.java

/*
 * 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.drill.exec.rpc.data;

import io.netty.buffer.ByteBuf;
import io.netty.channel.socket.SocketChannel;

import java.util.UUID;

import org.apache.drill.exec.memory.BufferAllocator;
import org.apache.drill.exec.proto.BitData.RpcType;
import org.apache.drill.exec.rpc.AbstractClientConnection;
import org.apache.drill.exec.rpc.EncryptionContext;
import org.apache.drill.exec.rpc.RpcOutcomeListener;

import com.google.protobuf.MessageLite;
import org.slf4j.Logger;

// data connection on client-side (i.e. bit making request or sending data)
public class DataClientConnection extends AbstractClientConnection {
  private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(DataClientConnection.class);

  private final DataClient client;
  private final UUID id;

  public DataClientConnection(SocketChannel channel, DataClient client,
                              EncryptionContext encryptionContextImpl) {
    super(channel, "data client", encryptionContextImpl);
    this.client = client;
    this.id = UUID.randomUUID();
  }

  @Override
  public BufferAllocator getAllocator() {
    return client.getAllocator();
  }

  public <SEND extends MessageLite, RECEIVE extends MessageLite>
  void send(RpcOutcomeListener<RECEIVE> outcomeListener, RpcType rpcType, SEND protobufBody,
            Class<RECEIVE> clazz, ByteBuf... dataBodies) {
    client.send(outcomeListener, this, rpcType, protobufBody, clazz, dataBodies);
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + ((id == null) ? 0 : id.hashCode());
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null) {
      return false;
    }
    if (getClass() != obj.getClass()) {
      return false;
    }
    DataClientConnection other = (DataClientConnection) obj;
    if (id == null) {
      if (other.id != null) {
        return false;
      }
    } else if (!id.equals(other.id)) {
      return false;
    }
    return true;
  }

  @Override
  protected Logger getLogger() {
    return logger;
  }

  @Override
  public void incConnectionCounter() {
    DataRpcMetrics.getInstance().addConnectionCount();
  }

  @Override
  public void decConnectionCounter() {
    DataRpcMetrics.getInstance().decConnectionCount();
  }
}