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Google Api eXtensions for Java (gRPC)
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/*
 * Copyright 2018 Google LLC
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google LLC nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.google.api.gax.grpc;

import com.google.api.gax.rpc.ResponseObserver;
import com.google.api.gax.rpc.StateCheckingResponseObserver;
import com.google.api.gax.rpc.StreamController;
import java.util.concurrent.CancellationException;

/** Package-private for internal use. */
class ExceptionResponseObserver
    extends StateCheckingResponseObserver {
  private ResponseObserver innerObserver;
  private volatile CancellationException cancellationException;
  private final GrpcApiExceptionFactory exceptionFactory;

  public ExceptionResponseObserver(
      ResponseObserver innerObserver, GrpcApiExceptionFactory exceptionFactory) {
    this.innerObserver = innerObserver;
    this.exceptionFactory = exceptionFactory;
  }

  @Override
  protected void onStartImpl(final StreamController controller) {
    innerObserver.onStart(
        new StreamController() {
          @Override
          public void cancel() {
            cancellationException = new CancellationException("User cancelled stream");
            controller.cancel();
          }

          @Override
          public void disableAutoInboundFlowControl() {
            controller.disableAutoInboundFlowControl();
          }

          @Override
          public void request(int count) {
            controller.request(count);
          }
        });
  }

  @Override
  protected void onResponseImpl(ResponseT response) {
    innerObserver.onResponse(response);
  }

  @Override
  protected void onErrorImpl(Throwable t) {
    if (cancellationException != null) {
      t = cancellationException;
    } else {
      t = exceptionFactory.create(t);
    }
    innerObserver.onError(t);
  }

  @Override
  protected void onCompleteImpl() {
    innerObserver.onComplete();
  }
}