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/*
* Fabric3
* Copyright (c) 2009-2011 Metaform Systems
*
* Fabric3 is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version, with the
* following exception:
*
* Linking this software statically or dynamically with other
* modules is making a combined work based on this software.
* Thus, the terms and conditions of the GNU General Public
* License cover the whole combination.
*
* As a special exception, the copyright holders of this software
* give you permission to link this software with independent
* modules to produce an executable, regardless of the license
* terms of these independent modules, and to copy and distribute
* the resulting executable under terms of your choice, provided
* that you also meet, for each linked independent module, the
* terms and conditions of the license of that module. An
* independent module is a module which is not derived from or
* based on this software. If you modify this software, you may
* extend this exception to your version of the software, but
* you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version.
*
* Fabric3 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the
* GNU General Public License along with Fabric3.
* If not, see .
*/
package org.fabric3.timer.spi;
import java.util.concurrent.Callable;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
/**
* Executes scheduled tasks.
*
* @version $Rev: 9763 $ $Date: 2011-01-03 00:48:06 +0000 (Mon, 03 Jan 2011) $
*/
public interface TimerService {
String DEFAULT_POOL = "default";
/**
* Allocates a timer thread pool.
*
* @param poolName the pool name
* @param coreSize the thread pool size
* @throws PoolAllocationException if there is an error allocating the pool
*/
void allocate(String poolName, int coreSize) throws PoolAllocationException;
/**
* Shuts down and de-allocates a timer thread pool.
*
* @param poolName the pool name
* @throws PoolAllocationException if there is an error de-allocating the pool
*/
void deallocate(String poolName) throws PoolAllocationException;
/**
* Creates and executes a recurring action.
*
* @param poolName the timer thread pool to schedule the task with
* @param task the task to execute
* @return a ScheduledFuture representing pending completion of the task and whose get() method will return null upon
* completion
* @throws RejectedExecutionException if the task cannot be scheduled for execution
* @throws NullPointerException if command is null
*/
ScheduledFuture scheduleRecurring(String poolName, Task task);
/**
* Creates and executes a one-shot action that becomes enabled after the given delay.
*
* @param poolName the timer thread pool to schedule the task with
* @param command the task to execute
* @param delay the time from now to delay execution
* @param unit the time unit of the delay parameter
* @return a ScheduledFuture representing pending completion of the task and whose get() method will return null upon
* completion
* @throws RejectedExecutionException if the task cannot be scheduled for execution
* @throws NullPointerException if command is null
*/
ScheduledFuture schedule(String poolName, Runnable command, long delay, TimeUnit unit);
/**
* Creates and executes a ScheduledFuture that becomes enabled after the given delay.
*
* @param poolName the timer thread pool to schedule the task with
* @param callable the function to execute
* @param delay the time from now to delay execution
* @param unit the time unit of the delay parameter
* @return a ScheduledFuture that can be used to extract result or cancel
* @throws RejectedExecutionException if the task cannot be scheduled for execution
* @throws NullPointerException if callable is null
*/
ScheduledFuture schedule(String poolName, Callable callable, long delay, TimeUnit unit);
/**
* Creates and executes a periodic action that becomes enabled first after the given initial delay, and subsequently with the given period; that
* is executions will commence after initialDelay then initialDelay+period, then initialDelay + 2 * period, and so on.
* If any execution of the task encounters an exception, subsequent executions are suppressed. Otherwise, the task will only terminate via
* cancellation or termination of the executor. If any execution of this task takes longer than its period, then subsequent executions may start
* late, but will not concurrently execute.
*
* @param poolName the timer thread pool to schedule the task with
* @param command the task to execute
* @param initialDelay the time to delay first execution
* @param period the period between successive executions
* @param unit the time unit of the initialDelay and period parameters
* @return a ScheduledFuture representing pending completion of the task, and whose get() method will throw an exception upon
* cancellation
* @throws RejectedExecutionException if the task cannot be scheduled for execution
* @throws NullPointerException if command is null
* @throws IllegalArgumentException if period less than or equal to zero
*/
ScheduledFuture scheduleAtFixedRate(String poolName, Runnable command, long initialDelay, long period, TimeUnit unit);
/**
* Creates and executes a periodic action that becomes enabled first after the given initial delay, and subsequently with the given delay between
* the termination of one execution and the commencement of the next. If any execution of the task encounters an exception, subsequent executions
* are suppressed. Otherwise, the task will only terminate via cancellation or termination of the executor.
*
* @param poolName the timer thread pool to schedule the task with
* @param command the task to execute
* @param initialDelay the time to delay first execution
* @param delay the delay between the termination of one execution and the commencement of the next
* @param unit the time unit of the initialDelay and delay parameters
* @return a ScheduledFuture representing pending completion of the task, and whose get() method will throw an exception upon
* cancellation
* @throws RejectedExecutionException if the task cannot be scheduled for execution
* @throws NullPointerException if command is null
* @throws IllegalArgumentException if delay less than or equal to zero
*/
ScheduledFuture scheduleWithFixedDelay(String poolName, Runnable command, long initialDelay, long delay, TimeUnit unit);
}
