com.sun.xml.ws.api.server.Adapter Maven / Gradle / Ivy
Show all versions of webservices-rt Show documentation
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2017 Oracle and/or its affiliates. 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://oss.oracle.com/licenses/CDDL+GPL-1.1
* or 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 LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [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.xml.ws.api.server;
import com.sun.xml.ws.api.config.management.Reconfigurable;
import com.sun.xml.ws.api.Component;
import com.sun.xml.ws.api.pipe.Codec;
import com.sun.xml.ws.api.message.Packet;
import com.sun.xml.ws.api.server.WSEndpoint.PipeHead;
import com.sun.xml.ws.util.Pool;
/**
* Receives incoming messages from a transport (such as HTTP, JMS, etc)
* in a transport specific way, and delivers it to {@link WSEndpoint.PipeHead#process}.
*
*
* Since this class mostly concerns itself with converting a
* transport-specific message representation to a {@link Packet},
* the name is the "adapter".
*
*
* The purpose of this class is twofolds:
*
*
* -
* To hide the logic of converting a transport-specific connection
* to a {@link Packet} and do the other way around.
*
*
-
* To manage thread-unsafe resources, such as {@link WSEndpoint.PipeHead},
* and {@link Codec}.
*
*
*
* {@link Adapter}s are extended to work with each kind of transport,
* and therefore {@link Adapter} class itself is not all that
* useful by itself --- it merely provides a design template
* that can be followed.
*
*
* For managing resources, an adapter uses an object called {@link Toolkit}
* (think of it as a tray full of tools that a dentist uses ---
* trays are identical, but each patient has to get one. You have
* a pool of them and you assign it to a patient.)
*
* {@link Adapter.Toolkit} can be extended by derived classes.
* That actual type is the {@code TK} type parameter this class takes.
*
* @author Kohsuke Kawaguchi
*/
public abstract class Adapter
implements Reconfigurable, Component {
protected final WSEndpoint endpoint;
/**
* Object that groups all thread-unsafe resources.
*/
public class Toolkit {
/**
* For encoding/decoding infoset to/from the byte stream.
*/
public final Codec codec;
/**
* This object from {@link WSEndpoint} serves the request.
*/
public final PipeHead head;
public Toolkit() {
this.codec = endpoint.createCodec();
this.head = endpoint.createPipeHead();
}
}
/**
* Pool of {@link Toolkit}s.
*
* Instances of this pool may be replaced at runtime. Therefore, when you take
* an object out of the pool, you must make sure that it is recycled by the
* same instance of the pool.
*/
protected volatile Pool pool = new Pool() {
protected TK create() {
return createToolkit();
}
};
/**
* Creates an {@link Adapter} that delivers
* messages to the given endpoint.
*/
protected Adapter(WSEndpoint endpoint) {
assert endpoint!=null;
this.endpoint = endpoint;
// Enables other components to reconfigure this adapter
endpoint.getComponents().add(getEndpointComponent());
}
protected Component getEndpointComponent() {
return new Component() {
public S getSPI(Class spiType) {
if (spiType.isAssignableFrom(Reconfigurable.class)) {
return spiType.cast(Adapter.this);
}
return null;
}
};
}
/**
* The pool instance needs to be recreated to prevent reuse of old Toolkit instances.
*/
public void reconfigure() {
this.pool = new Pool() {
protected TK create() {
return createToolkit();
}
};
}
public S getSPI(Class spiType) {
if (spiType.isAssignableFrom(Reconfigurable.class)) {
return spiType.cast(this);
}
if (endpoint != null) {
return endpoint.getSPI(spiType);
}
return null;
}
/**
* Gets the endpoint that this {@link Adapter} is serving.
*
* @return
* always non-null.
*/
public WSEndpoint getEndpoint() {
return endpoint;
}
/**
* Returns a reference to the pool of Toolkits for this adapter.
*
* The pool may be recreated during runtime reconfiguration and this method
* will then return a reference to a new instance. When you recycle a toolkit,
* you must make sure that you return it to the same pool instance that you
* took it from.
*
* @return
*/
protected Pool getPool() {
return pool;
}
/**
* Creates a {@link Toolkit} instance.
*
*
* If the derived class doesn't have to add any per-thread state
* to {@link Toolkit}, simply implement this as {@code new Toolkit()}.
*/
protected abstract TK createToolkit();
}