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Google Api eXtensions for Java (gRPC)
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/*
 * Copyright 2016 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.core.ApiFuture;
import com.google.api.core.InternalApi;
import com.google.api.core.ListenableFutureToApiFuture;
import com.google.api.gax.rpc.ApiCallContext;
import com.google.api.gax.rpc.UnaryCallable;
import com.google.common.base.Preconditions;
import io.grpc.ClientCall;
import io.grpc.MethodDescriptor;
import io.grpc.stub.ClientCalls;

/**
 * {@code GrpcDirectCallable} creates gRPC calls.
 *
 * Package-private for internal use.
 */
@InternalApi
class GrpcDirectCallable extends UnaryCallable {
  private final MethodDescriptor descriptor;
  private final boolean awaitTrailers;

  GrpcDirectCallable(MethodDescriptor descriptor, boolean awaitTrailers) {
    this.descriptor = Preconditions.checkNotNull(descriptor);
    this.awaitTrailers = awaitTrailers;
  }

  @Override
  public ApiFuture futureCall(RequestT request, ApiCallContext inputContext) {
    Preconditions.checkNotNull(request);
    Preconditions.checkNotNull(inputContext);

    ClientCall clientCall = GrpcClientCalls.newCall(descriptor, inputContext);

    if (awaitTrailers) {
      return new ListenableFutureToApiFuture<>(ClientCalls.futureUnaryCall(clientCall, request));
    } else {
      return GrpcClientCalls.eagerFutureUnaryCall(clientCall, request);
    }
  }

  @Override
  public String toString() {
    return String.format("direct(%s)", descriptor);
  }
}