org.h2.util

Class Task

java.lang.Object

org.h2.util.Task

All Implemented Interfaces:

java.lang.Runnable

public abstract class Task
extends java.lang.Object
implements java.lang.Runnable

A method call that is executed in a separate thread. If the method throws an exception, it is wrapped in a RuntimeException.

Field Summary

Fields

Modifier and Type	Field and Description
protected java.lang.Object	result The result, if any.
boolean	stop A flag indicating the get() method has been called.

Constructor Summary

Constructors

Constructor and Description
Task()

Method Summary

Methods

Modifier and Type	Method and Description
abstract void	call() The method to be implemented.
Task	execute() Start the thread.
Task	execute(java.lang.String threadName) Start the thread.
java.lang.Object	get() Calling this method will set the stop flag and wait until the thread is stopped.
java.lang.Exception	getException() Get the exception that was thrown in the call (if any).
void	interruptThread() Interrupt the thread.
boolean	isFinished() Whether the call method has returned (with or without exception).
void	join() Stop the thread and wait until it is no longer running.
void	run()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

stop

public volatile boolean stop

A flag indicating the get() method has been called.

result

protected java.lang.Object result

The result, if any.

Constructor Detail

Task

public Task()

Method Detail

call

public abstract void call()
                   throws java.lang.Exception

The method to be implemented.

Throws:

java.lang.Exception - any exception is wrapped in a RuntimeException

run

public void run()

Specified by:

run in interface java.lang.Runnable

execute

public Task execute()

Start the thread.

Returns:

this

execute

public Task execute(java.lang.String threadName)

Start the thread.

Parameters:

threadName - the name of the thread

Returns:

this

get

public java.lang.Object get()

Calling this method will set the stop flag and wait until the thread is stopped.

Returns:

the result, or null

Throws:

java.lang.RuntimeException - if an exception in the method call occurs

isFinished

public boolean isFinished()

Whether the call method has returned (with or without exception).

Returns:

true if yes

interruptThread

public void interruptThread()

Interrupt the thread.

getException

public java.lang.Exception getException()

Get the exception that was thrown in the call (if any).

Returns:

the exception or null

join

public void join()

Stop the thread and wait until it is no longer running. Exceptions are ignored.