Package com.google.common.util.concurrent

Interface Service

    • Method Detail

      • start

        @Deprecated
ListenableFuture<Service.State> start()
        Deprecated.
        Use startAsync() instead of this method to start the Service or use a Service.Listener to asynchronously wait for service startup.
        If the service state is Service.State.NEW, this initiates service startup and returns immediately. If the service has already been started, this method returns immediately without taking action. A stopped service may not be restarted.
        Returns:
        a future for the startup result, regardless of whether this call initiated startup. Calling Future.get() will block until the service has finished starting, and returns one of Service.State.RUNNING, Service.State.STOPPING or Service.State.TERMINATED. If the service fails to start, Future.get() will throw an ExecutionException, and the service's state will be Service.State.FAILED. If it has already finished starting, Future.get() returns immediately. Cancelling this future has no effect on the service.

      • startAndWait

        @Deprecated
Service.State startAndWait()
        Deprecated.
        Use startAsync() and awaitRunning() instead of this method.
        Initiates service startup (if necessary), returning once the service has finished starting. Unlike calling start().get(), this method throws no checked exceptions, and it cannot be interrupted.
        Returns:
        the state of the service when startup finished.
        Throws:
        UncheckedExecutionException - if startup failed

      • startAsync

        Service startAsync()
        If the service state is Service.State.NEW, this initiates service startup and returns immediately. A stopped service may not be restarted.
        Returns:
        this
        Throws:
        java.lang.IllegalStateException - if the service is not Service.State.NEW
        Since:
        15.0

      • isRunning

        boolean isRunning()
        Returns true if this service is running.

      • state

        Service.State state()
        Returns the lifecycle state of the service.

      • stop

        @Deprecated
ListenableFuture<Service.State> stop()
        Deprecated.
        Use stopAsync() instead of this method to initiate service shutdown or use a service Service.Listener to asynchronously wait for service shutdown.
        If the service is starting or running, this initiates service shutdown and returns immediately. If the service is new, it is terminated without having been started nor stopped. If the service has already been stopped, this method returns immediately without taking action.
        Returns:
        a future for the shutdown result, regardless of whether this call initiated shutdown. Calling Future.get() will block until the service has finished shutting down, and either returns Service.State.TERMINATED or throws an ExecutionException. If it has already finished stopping, Future.get() returns immediately. Cancelling this future has no effect on the service.

      • stopAndWait

        @Deprecated
Service.State stopAndWait()
        Deprecated.
        Use stopAsync() and awaitTerminated() instead of this method.
        Initiates service shutdown (if necessary), returning once the service has finished stopping. If this is Service.State.STARTING, startup will be cancelled. If this is Service.State.NEW, it is terminated without having been started nor stopped. Unlike calling stop().get(), this method throws no checked exceptions.
        Returns:
        the state of the service when shutdown finished.
        Throws:
        UncheckedExecutionException - if the service has failed or fails during shutdown

      • stopAsync

        Service stopAsync()
        If the service is starting or running, this initiates service shutdown and returns immediately. If the service is new, it is terminated without having been started nor stopped. If the service has already been stopped, this method returns immediately without taking action.
        Returns:
        this
        Since:
        15.0

      • awaitRunning

        void awaitRunning()
        Waits for the Service to reach the running state.
        Throws:
        java.lang.IllegalStateException - if the service reaches a state from which it is not possible to enter the Service.State.RUNNING state. e.g. if the state is State#TERMINATED when this method is called then this will throw an IllegalStateException.
        Since:
        15.0

      • awaitRunning

        void awaitRunning​(long timeout,
                  java.util.concurrent.TimeUnit unit)
           throws java.util.concurrent.TimeoutException
        Waits for the Service to reach the running state for no more than the given time.
        Parameters:
        timeout - the maximum time to wait
        unit - the time unit of the timeout argument
        Throws:
        java.util.concurrent.TimeoutException - if the service has not reached the given state within the deadline
        java.lang.IllegalStateException - if the service reaches a state from which it is not possible to enter the RUNNING state. e.g. if the state is State#TERMINATED when this method is called then this will throw an IllegalStateException.
        Since:
        15.0

      • awaitTerminated

        void awaitTerminated()
        Waits for the Service to reach the terminated state.
        Throws:
        java.lang.IllegalStateException - if the service fails.
        Since:
        15.0

      • awaitTerminated

        void awaitTerminated​(long timeout,
                     java.util.concurrent.TimeUnit unit)
              throws java.util.concurrent.TimeoutException
        Waits for the Service to reach a terminal state (either terminated or failed) for no more than the given time.
        Parameters:
        timeout - the maximum time to wait
        unit - the time unit of the timeout argument
        Throws:
        java.util.concurrent.TimeoutException - if the service has not reached the given state within the deadline
        java.lang.IllegalStateException - if the service fails.
        Since:
        15.0

      • failureCause

        java.lang.Throwable failureCause()
        Returns the Throwable that caused this service to fail.
        Throws:
        java.lang.IllegalStateException - if this service's state isn't FAILED.
        Since:
        14.0

      • addListener

        void addListener​(Service.Listener listener,
                 java.util.concurrent.Executor executor)
        Registers a Service.Listener to be executed on the given executor. The listener will have the corresponding transition method called whenever the service changes state. The listener will not have previous state changes replayed, so it is suggested that listeners are added before the service starts.

        There is no guaranteed ordering of execution of listeners, but any listener added through this method is guaranteed to be called whenever there is a state change.

        Exceptions thrown by a listener will be propagated up to the executor. Any exception thrown during Executor.execute (e.g., a RejectedExecutionException or an exception thrown by inline execution) will be caught and logged.

        Parameters:
        listener - the listener to run when the service changes state is complete
        executor - the executor in which the listeners callback methods will be run. For fast, lightweight listeners that would be safe to execute in any thread, consider MoreExecutors.sameThreadExecutor().
        Since:
        13.0