ProcessIOExecutorService.java

package com.intellij.execution.process;

import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.TestOnly;

import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * A thread pool for long-running workers needed for handling child processes, to avoid occupying workers in the main application pool
 * and constantly creating new threads there.
 *
 * @since 2016.2
 * @author peter
 */
public class ProcessIOExecutorService extends ThreadPoolExecutor {
  public static final String POOLED_THREAD_PREFIX = "Process I/O pool ";
  public static final ExecutorService INSTANCE = new ProcessIOExecutorService();
  private final AtomicInteger counter = new AtomicInteger();

  private ProcessIOExecutorService() {
    super(1, Integer.MAX_VALUE, 1, TimeUnit.MINUTES, new SynchronousQueue<Runnable>());
    setThreadFactory(new ThreadFactory() {
          @NotNull
          @Override
          public Thread newThread(@NotNull final Runnable r) {
            Thread thread = new Thread(r, POOLED_THREAD_PREFIX + counter.incrementAndGet());
            thread.setPriority(Thread.NORM_PRIORITY - 1);
            return thread;
          }
        });
  }

  @TestOnly
  public int getThreadCounter() {
    return counter.get();
  }
}