/**
 * Licensed to Cloudera, Inc. under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  Cloudera, Inc. 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 com.cloudera.flume.handlers.thrift;

import java.util.concurrent.atomic.AtomicLong;

import org.apache.thrift.transport.TTransport;
import org.apache.thrift.transport.TTransportException;

/**
 * This transport wraps another transport and tracks the number of bytes read
 * and written to the transport.
 * 
 * Using atomic longs so there may be some spin contention when concurrent.
 * (need to test).
 */
public class TStatsTransport extends TTransport {
  TTransport trans;

  AtomicLong bytesRead = new AtomicLong();
  AtomicLong bytesWritten = new AtomicLong();

  public TStatsTransport(TTransport trans) {
    this.trans = trans;
  }

  @Override
  public void close() {
    trans.close();
  }

  @Override
  public boolean isOpen() {
    return trans.isOpen();
  }

  @Override
  public void open() throws TTransportException {
    trans.open();
  }

  @Override
  public int read(byte[] buf, int off, int len) throws TTransportException {
    int ret = trans.read(buf, off, len);
    bytesRead.addAndGet(ret);
    return ret;
  }

  @Override
  public void flush() throws TTransportException {
    trans.flush();
  }

  public void write(byte[] buf, int off, int len) throws TTransportException {
    trans.write(buf, off, len);
    bytesWritten.addAndGet(len);
  }

  public long getBytesRead() {
    return bytesRead.get();
  }

  public long getBytesWritten() {
    return bytesWritten.get();
  }

}