DuplexOpSinkFactory.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.waveprotocol.wave.concurrencycontrol.wave;

import org.waveprotocol.wave.model.operation.wave.WaveletOperation;

import org.waveprotocol.wave.model.id.WaveletId;
import org.waveprotocol.wave.model.operation.SilentOperationSink;

/**
 * Factory for creating op taps
 *
 */
public interface DuplexOpSinkFactory {
  DuplexOpSink create(WaveletId waveletId, FlushingOperationSink<WaveletOperation> fromChannel,
      SilentOperationSink<? super WaveletOperation> toChannel);

  final DuplexOpSinkFactory PASS_THROUGH = new DuplexOpSinkFactory() {
    @Override
    public DuplexOpSink create(WaveletId waveletId,
        final FlushingOperationSink<WaveletOperation> fromChannel,
        final SilentOperationSink<? super WaveletOperation> toChannel) {
      return new DuplexOpSink() {
        @Override
        public FlushingOperationSink<WaveletOperation> incoming() {
          return fromChannel;
        }

        @Override
        public SilentOperationSink<? super WaveletOperation> outgoing() {
          return toChannel;
        }
      };
    }};
}