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Google Api eXtensions for Java (gRPC)
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/*
 * Copyright 2017 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
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 */
package com.google.api.gax.grpc;

import com.google.api.gax.rpc.ApiCallContext;
import com.google.api.gax.rpc.ApiStreamObserver;
import com.google.api.gax.rpc.ClientStreamingCallable;
import com.google.common.base.Preconditions;
import io.grpc.ClientCall;
import io.grpc.MethodDescriptor;
import io.grpc.stub.ClientCalls;

/**
 * {@code GrpcDirectClientStreamingCallable} creates client-streaming gRPC calls.
 *
 * It is used to bridge the abstractions provided by gRPC and GAX.
 *
 * Package-private for internal use.
 */
class GrpcDirectClientStreamingCallable
    extends ClientStreamingCallable {
  private final MethodDescriptor descriptor;

  GrpcDirectClientStreamingCallable(MethodDescriptor descriptor) {
    this.descriptor = Preconditions.checkNotNull(descriptor);
  }

  @Override
  public ApiStreamObserver clientStreamingCall(
      ApiStreamObserver responseObserver, ApiCallContext context) {
    Preconditions.checkNotNull(responseObserver);
    ClientCall call = GrpcClientCalls.newCall(descriptor, context);
    return new StreamObserverDelegate<>(
        ClientCalls.asyncClientStreamingCall(
            call, new ApiStreamObserverDelegate<>(responseObserver)));
  }
}