core/src/main/java/io/grpc/internal/FailingClientTransport.java

/*
 * Copyright 2016, Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
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 *
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 * 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.
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 * 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
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package io.grpc.internal;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import io.grpc.CallOptions;
import io.grpc.Metadata;
import io.grpc.MethodDescriptor;
import io.grpc.Status;
import java.util.concurrent.Executor;

/**
 * A client transport that creates streams that will immediately fail when started.
 */
class FailingClientTransport implements ClientTransport {

  @VisibleForTesting
  final Status error;

  FailingClientTransport(Status error) {
    Preconditions.checkArgument(!error.isOk(), "error must not be OK");
    this.error = error;
  }

  @Override
  public ClientStream newStream(MethodDescriptor<?, ?> method, Metadata headers,
      CallOptions callOptions, StatsTraceContext statsTraceCtx) {
    return new FailingClientStream(error);
  }

  @Override
  public ClientStream newStream(MethodDescriptor<?, ?> method, Metadata headers) {
    return newStream(method, headers, CallOptions.DEFAULT, StatsTraceContext.NOOP);
  }

  @Override
  public void ping(final PingCallback callback, Executor executor) {
    executor.execute(new Runnable() {
        @Override public void run() {
          callback.onFailure(error.asException());
        }
      });
  }
}