com.sun.grizzly.RoundRobinSelectorHandler Maven / Gradle / Ivy
/*
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 2007-2008 Sun Microsystems, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
* a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
* or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
* identifying information: "Portions Copyrighted [year]
* [name of copyright owner]"
*
* Contributor(s):
*
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*
*/
package com.sun.grizzly;
import com.sun.grizzly.Controller.Protocol;
import com.sun.grizzly.util.Copyable;
import java.io.IOException;
import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;
import java.util.Set;
/**
* A SelectorHandler handles all java.nio.channels.Selector operations.
* One or more instance of a Selector are handled by SelectorHandler.
* The logic for processing of SelectionKey interest (OP_ACCEPT,OP_READ, etc.)
* is usually defined using an instance of SelectorHandler.
*
* This class represents a TCP implementation of a SelectorHandler,
* which handles "accept" events by registering newly accepted connections
* to auxiliary {@link Controller}s in a round robin fashion.
*
* @author Alexey Stashok
*/
public class RoundRobinSelectorHandler extends TCPSelectorHandler
implements ComplexSelectorHandler {
private ReadController[] rrControllers;
private int roundRobinCounter;
private Set customProtocols;
public RoundRobinSelectorHandler() {}
public RoundRobinSelectorHandler(ReadController[] rrControllers) {
this.rrControllers = rrControllers;
}
@Override
public void copyTo(Copyable copy) {
super.copyTo(copy);
RoundRobinSelectorHandler copyHandler = (RoundRobinSelectorHandler) copy;
copyHandler.roundRobinCounter = roundRobinCounter;
copyHandler.rrControllers = rrControllers;
}
@Override
public boolean onAcceptInterest(SelectionKey key, Context context) throws IOException {
ReadController auxController = nextController();
SelectorHandler protocolSelectorHandler = context.getSelectorHandler();
SelectableChannel channel = protocolSelectorHandler.acceptWithoutRegistration(key);
if (channel != null) {
protocolSelectorHandler.configureChannel(channel);
SelectorHandler relativeSelectorHandler =
auxController.getSelectorHandlerClone(protocolSelectorHandler);
if (relativeSelectorHandler == null) {
// Clone was not found - take correspondent protocol SelectorHandler
relativeSelectorHandler =
auxController.getSelectorHandler(protocolSelectorHandler.protocol());
}
auxController.addChannel(channel, relativeSelectorHandler);
}
return false;
}
/**
* Add custom protocol support
* @param customProtocol custom {@link Controller.Protocol}
*/
public void addProtocolSupport(Protocol customProtocol) {
customProtocols.add(customProtocol);
}
/**
* {@inheritDoc}
*/
public boolean supportsProtocol(Protocol protocol) {
return protocol == Protocol.TCP || protocol == Protocol.TLS ||
customProtocols.contains(protocol);
}
/**
* Return next aux. ReadController to process an accepted connection
* @return{@link ReadController}
*/
private ReadController nextController() {
return rrControllers[roundRobinCounter++ % rrControllers.length];
}
}