/**
 * Copyright 2010 Google Inc.
 *
 * Licensed 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.waveprotocol.wave.federation.xmpp;

import org.xmpp.packet.Packet;

import java.util.LinkedList;
import java.util.Queue;

/**
 * Dummy implementation of {@link OutgoingPacketTransport} that stores packets
 * being sent over-the-wire. May optionally accept a {@link Router} instance
 * where packets are automatically forwarded.
 *
 * @author thorogood@google.com (Sam Thorogood)
 */
public class MockOutgoingPacketTransport implements OutgoingPacketTransport {

  public interface Router {
    public void route(Packet packet);
  }

  // wrapped router object, if null then packets are not routed
  public Router router;

  // pending outgoing packets
  public final Queue<Packet> packets = new LinkedList<Packet>();

  // last packet sent
  public Packet lastPacketSent = null;

  // total number of packets sent here
  public long packetsSent = 0;

  public MockOutgoingPacketTransport() {
    router = null;
  }

  public MockOutgoingPacketTransport(Router router) {
    this.router = router;
  }

  @Override
  public void sendPacket(Packet packet) {
    if (!packets.offer(packet)) {
      throw new IllegalStateException("Can't offer packet to queue: " + packets);
    }
    lastPacketSent = packet;
    packetsSent++;

    if (router != null) {
      router.route(packet);
    }
  }

}