content: /*
   * 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.calcite.avatica.remote;
  
  import org.apache.calcite.avatica.metrics.MetricsSystem;
  import org.apache.calcite.avatica.metrics.Timer;
  import org.apache.calcite.avatica.metrics.Timer.Context;
  import org.apache.calcite.avatica.remote.Service.Response;
  
  import java.io.IOException;
  
  /**
   * Dispatches serialized protocol buffer messages to the provided {@link Service}
   * by converting them to the POJO Request. Returns back the serialized protocol
   * buffer response.
   */
  public class ProtobufHandler extends AbstractHandler<byte[]> {
  
    private final ProtobufTranslation translation;
    private final MetricsSystem metrics;
    private final Timer serializationTimer;
  
    public ProtobufHandler(Service service, ProtobufTranslation translation, MetricsSystem metrics) {
      super(service);
      this.translation = translation;
      this.metrics = metrics;
      this.serializationTimer = this.metrics.getTimer(
          MetricsHelper.concat(ProtobufHandler.class, HANDLER_SERIALIZATION_METRICS_NAME));
    }
  
    @Override public HandlerResponse<byte[]> apply(byte[] requestBytes) {
      return super.apply(requestBytes);
    }
  
    @Override Service.Request decode(byte[] serializedRequest) throws IOException {
      try (Context ctx = serializationTimer.start()) {
        return translation.parseRequest(serializedRequest);
      }
    }
  
    @Override byte[] encode(Response response) throws IOException {
      try (Context ctx = serializationTimer.start()) {
        return translation.serializeResponse(response);
      }
    }
  }
  
  // End ProtobufHandler.java
  