nl.topicus.jdbc.shaded.com.google.api.gax.core.InstantiatingExecutorProvider Maven / Gradle / Ivy

/*
 * Copyright 2016, Google LLC All rights reserved.
 *
 * 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 nl.topicus.jdbc.shaded.com.google.api.gax.core;

import nl.topicus.jdbc.shaded.com.google.auto.value.AutoValue;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.ThreadFactory;

/**
 * InstantiatingChannelProvider is an ExecutorProvider which constructs a new
 * ScheduledExecutorService every time getExecutor() is called.
 */
@AutoValue
public abstract class InstantiatingExecutorProvider implements ExecutorProvider {
  // The number of threads to use with the default executor.
  private static final int DEFAULT_EXECUTOR_THREADS = 4;

  // Package-private constructor prevents others from subclassing.
  InstantiatingExecutorProvider() {}

  @Override
  public ScheduledExecutorService getExecutor() {
    return new ScheduledThreadPoolExecutor(
        getExecutorThreadCount(),
        new ThreadFactory() {
          @Override
          public Thread newThread(Runnable r) {
            Thread t = new Thread(r);
            t.setDaemon(true);
            return t;
          }
        });
  }

  @Override
  public boolean shouldAutoClose() {
    return true;
  }

  /** The number of threads used by the executor created by this ExecutorProvider. */
  public abstract int getExecutorThreadCount();

  public Builder toBuilder() {
    return new AutoValue_InstantiatingExecutorProvider.Builder(this);
  }

  public static Builder newBuilder() {
    return new AutoValue_InstantiatingExecutorProvider.Builder()
        .setExecutorThreadCount(DEFAULT_EXECUTOR_THREADS);
  }

  @AutoValue.Builder
  public abstract static class Builder {
    public abstract Builder setExecutorThreadCount(int value);

    public abstract int getExecutorThreadCount();

    public abstract InstantiatingExecutorProvider build();
  }
}