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/*
* ExecuteAction.java February 2007
*
* Copyright (C) 2007, Niall Gallagher <niallg@users.sf.net>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
package org.simpleframework.transport.reactor;
import java.nio.channels.SelectableChannel;
/**
* The <code>ExecuteAction</code> object is represents an action
* that the distributor is to process. This contains the operation
* and the required I/O events as an integer bit mask as well as the
* selectable channel used to register for selection. In order to
* ensure that the action does not remain within the distributor for
* too long the action has an expiry time.
*
* @author Niall Gallagher
*/
class ExecuteAction implements Action {
/**
* The task to execute when the required operations is ready.
*/
private final Operation task;
/**
* This is the bit mask of required operations to be executed.
*/
private final int require;
/**
* This is the time in the future that the event will expire in.
*/
private final long expiry;
/**
* Constructor for the <code>Event</code> object. The actions are
* used to encapsulate the task to execute and the operations
* to listen to when some action is to be performed.
*
* @param task this is the task to be executed when it is ready
* @param require this is the required operations to listen to
*/
public ExecuteAction(Operation task, int require, long expiry) {
this.expiry = System.currentTimeMillis() + expiry;
this.require = require;
this.task = task;
}
/**
* This is used to execute the operation for the action. This will
* be executed when the interested I/O event is ready for the
* associated <code>SelectableChannel</code> object. If the action
* expires before the interested I/O operation is ready this will
* not be executed, instead the operation is canceled.
*/
public void run() {
task.run();
}
/**
* This is used to get the expiry for the operation. The expiry
* represents some static time in the future when the action will
* expire if it does not become ready. This is used to cancel the
* operation so that it does not remain in the distributor.
*
* @return the remaining time this operation will wait for
*/
public long getExpiry() {
return expiry;
}
/**
* This is the <code>SelectableChannel</code> which is used to
* determine if the operation should be executed. If the channel
* is ready for a given I/O event it can be run. For instance if
* the operation is used to perform some form of read operation
* it can be executed when ready to read data from the channel.
*
* @return this returns the channel used to govern execution
*/
public SelectableChannel getChannel() {
return task.getChannel();
}
/**
* This is used to acquire the <code>Operation</code> that is to
* be executed when the required operations are ready. It is the
* responsibility of the distributor to invoke the operation.
*
* @return the operation to be executed when it is ready
*/
public Operation getOperation() {
return task;
}
/**
* This returns the I/O operations that the action is interested
* in as an integer bit mask. When any of these operations are
* ready the distributor will execute the provided operation.
*
* @return the integer bit mask of interested I/O operations
*/
public int getInterest() {
return require;
}
}
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