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Uber Cadence Java Client

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/*
 *  Copyright 2012-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 *  Modifications copyright (C) 2017 Uber Technologies, Inc.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"). You may not
 *  use this file except in compliance with the License. A copy of the License is
 *  located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 *  or in the "license" file accompanying this file. This file 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 com.uber.cadence.internal.worker;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;

/**
 * Helper class that is used instead of null for non initialized worker. This eliminates needs for
 * null checks when calling into it.
 */
class NoopSuspendableWorker implements SuspendableWorker {

  private AtomicBoolean shutdown = new AtomicBoolean();

  @Override
  public boolean isShutdown() {
    return shutdown.get();
  }

  @Override
  public boolean isTerminated() {
    return shutdown.get();
  }

  @Override
  public void shutdown() {
    shutdown.set(true);
  }

  @Override
  public void shutdownNow() {
    shutdown.set(true);
  }

  @Override
  public void awaitTermination(long timeout, TimeUnit unit) {}

  @Override
  public void start() {
    throw new IllegalStateException("Non startable");
  }

  @Override
  public boolean isStarted() {
    return false;
  }

  @Override
  public void suspendPolling() {
    throw new IllegalStateException("Non suspendable");
  }

  @Override
  public void resumePolling() {
    throw new IllegalStateException("Non resumable");
  }

  @Override
  public boolean isSuspended() {
    return false;
  }
}