/*
 * 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.reef.wake.remote.transport.netty;

import org.apache.reef.wake.remote.transport.LinkListener;

import java.net.SocketAddress;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Link listener that logs whether the message is sent successfully.
 *
 * @param <T> type
 */
public class LoggingLinkListener<T> implements LinkListener<T> {

  private static final Logger LOG = Logger.getLogger(LoggingLinkListener.class.getName());

  /**
   * Called when the sent message is transferred successfully.
   */
  @Override
  public void onSuccess(final T message) {
    LOG.log(Level.FINEST, "Message successfully sent: {0}", message);
  }

  /**
   * Called when the sent message to remoteAddress is failed to be transferred.
   */
  @Override
  public void onException(final Throwable cause, final SocketAddress remoteAddress, final T message) {
    if (LOG.isLoggable(Level.FINEST)) {
      LOG.log(Level.FINEST, "Error sending message " + message + " to " + remoteAddress, cause);
    }
  }
}