ThreadManager (Google App Engine API for Java)

com.google.appengine.api

Class ThreadManager

  • java.lang.Object
    • com.google.appengine.api.ThreadManager


  • public final class ThreadManager
    extends java.lang.Object
    ThreadManager exposes a ThreadFactory that allows App Engine applications to spawn new threads.
    • Constructor Summary

      Constructors 
      Constructor and Description
      ThreadManager() 
    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method and Description
      static java.util.concurrent.ThreadFactory backgroundThreadFactory()
      Returns a ThreadFactory that will create threads that are independent of the current request.
      static java.lang.Thread createBackgroundThread(java.lang.Runnable runnable)
      Create a new Thread that executes runnable independent of the current request.
      static java.lang.Thread createThreadForCurrentRequest(java.lang.Runnable runnable)
      Create a new Thread that executes runnable for the duration of the current request.
      static java.util.concurrent.ThreadFactory currentRequestThreadFactory()
      Returns a ThreadFactory that will create threads scoped to the current request.
      • Methods inherited from class java.lang.Object

        equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Constructor Detail

      • ThreadManager

        public ThreadManager()
    • Method Detail

      • currentRequestThreadFactory

        public static java.util.concurrent.ThreadFactory currentRequestThreadFactory()
        Returns a ThreadFactory that will create threads scoped to the current request. These threads will be interrupted at the end of the current request and must complete within the request deadline.

        Your code has limited access to the threads created by this ThreadFactory. For example, you can call Thread.setUncaughtExceptionHandler(java.lang.Thread.UncaughtExceptionHandler) and Thread.interrupt(), but not Thread.stop() or any other methods that require RuntimePermission("modifyThread").

        The Java runtime will throw java.lang.IllegalStateException if you try to create more than 50 threads in a single request.

        Note that calling ThreadFactory.newThread(java.lang.Runnable) on the returned instance may throw any of the unchecked exceptions mentioned by createBackgroundThread(java.lang.Runnable).

      • createThreadForCurrentRequest

        public static java.lang.Thread createThreadForCurrentRequest(java.lang.Runnable runnable)
        Create a new Thread that executes runnable for the duration of the current request. Calling this method is equivalent to invoking ThreadFactory.newThread(java.lang.Runnable) on the ThreadFactory returned from currentRequestThreadFactory(). This thread will be interrupted at the end of the current request and must complete within the request deadline.
        Throws:
        java.lang.IllegalStateException - if you try to create more than 50 threads in a single request.
        ApiProxy.FeatureNotAvailableException - If this application cannot use this feature.
      • backgroundThreadFactory

        public static java.util.concurrent.ThreadFactory backgroundThreadFactory()
        Returns a ThreadFactory that will create threads that are independent of the current request.

        This ThreadFactory can currently only be used by backends.

        Note that calling ThreadFactory.newThread(java.lang.Runnable) on the returned instance may throw any of the unchecked exceptions mentioned by createBackgroundThread(java.lang.Runnable).

      • createBackgroundThread

        public static java.lang.Thread createBackgroundThread(java.lang.Runnable runnable)
        Create a new Thread that executes runnable independent of the current request. Calling this method is equivalent to invoking ThreadFactory#run on the ThreadFactory returned from backgroundThreadFactory().

        This method can currently only be used by backends.

        Throws:
        ApiProxy.FeatureNotAvailableException - If this application cannot use this feature.
        ApiProxy.CancelledException - If the request was interrupted while creating the new thread.
        ApiProxy.ApiDeadlineExceededException - If creation of the new thread took too long.

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