PriorityThreadFactory.java

/*
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */
package com.facebook.imagepipeline.core;

import android.os.Process;

import java.util.concurrent.ThreadFactory;

/**
 * ThreadFactory that applies a priority to the threads it creates.
 */
public class PriorityThreadFactory implements ThreadFactory {

  private final int mThreadPriority;

  /**
   * Creates a new PriorityThreadFactory with a given priority.
   *
   * <p>This value should be set to a value compatible with
   * {@link android.os.Process#setThreadPriority}, not {@link Thread#setPriority}.
   *
   */
  public PriorityThreadFactory(int threadPriority) {
    mThreadPriority = threadPriority;
  }

  @Override
  public Thread newThread(final Runnable runnable) {
    Runnable wrapperRunnable = new Runnable() {
      @Override
      public void run() {
        try {
          Process.setThreadPriority(mThreadPriority);
        } catch (Throwable t) {
          // just to be safe
        }
        runnable.run();
      }
    };
    return new Thread(wrapperRunnable);
  }

}