jdk8-mips64-public/jaxws: src/share/jaxws_classes/com/sun/xml/internal/ws/api/pipe/Tube.java@9c07ef4934dd (annotated)

src/share/jaxws_classes/com/sun/xml/internal/ws/api/pipe/Tube.java@9c07ef4934dd (annotated)

src/share/jaxws_classes/com/sun/xml/internal/ws/api/pipe/Tube.java

Thu, 31 Aug 2017 15:18:52 +0800

author: aoqi
date: Thu, 31 Aug 2017 15:18:52 +0800
changeset 637: 9c07ef4934dd
parent 368: 0989ad8c0860
parent 0: 373ffda63c9a
permissions: -rw-r--r--

merge

 /*
  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code 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
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */
 package com.sun.xml.internal.ws.api.pipe;
 import com.sun.istack.internal.NotNull;
 import com.sun.xml.internal.ws.api.message.Message;
 import com.sun.xml.internal.ws.api.message.Packet;
 import com.sun.xml.internal.ws.api.pipe.helper.AbstractFilterTubeImpl;
 import com.sun.xml.internal.ws.api.pipe.helper.AbstractTubeImpl;
 import com.sun.xml.internal.ws.api.server.Adapter;
 import javax.annotation.PreDestroy;
 import javax.xml.ws.Dispatch;
 import javax.xml.ws.Provider;
 import javax.xml.ws.WebServiceException;
 import javax.xml.ws.handler.LogicalHandler;
 import javax.xml.ws.handler.soap.SOAPHandler;
 import java.text.SimpleDateFormat;
 /**
  * Abstraction of the intermediate layers in the processing chain
  * and transport.
  *
  * <h2>What is a {@link Tube}?</h2>
  * <p>
  * {@link Tube} is a basic processing unit that represents SOAP-level
  * protocol handling code. Mutliple tubes are often put together in
  * a line (it needs not one dimensional &mdash; more later), and act on
  * {@link Packet}s in a sequential fashion.
  *
  * <p>
  * {@link Tube}s run asynchronously. That is, there is no guarantee that
  * {@link #processRequest(Packet)} and {@link #processResponse(Packet)} runs
  * in the same thread, nor is there any guarantee that this tube and next
  * tube runs in the same thread. Furthermore, one thread may be used to
  * run multiple pipeline in turn (just like a real CPU runs multiple
  * threads in turn.)
  *
  *
  * <h2>Tube examples</h2>
  * <p>
  * Transport is a kind of tube. It sends the {@link Packet}
  * through, say, HTTP connection, and receives the data back into another {@link Packet}.
  *
  * <p>
  * More often, a tube works like a filter. It acts on a packet,
  * and then it tells the JAX-WS that the packet should be passed into another
  * tube. It can do the same on the way back.
  *
  * <p>
  * For example, XWSS will be a {@link Tube}. It will act on a request
  * {@link Packet}, then perhaps wrap it into
  * another {@link Packet} to encrypt the body and add a header, then
  * the processing will go on to the next tube.
  *
  * <p>
  * Yet another kind of filter tube is those that wraps {@link LogicalHandler}
  * and {@link SOAPHandler}. These tubes are heavy-weight; they often consume
  * a message in a packet and create a new one, and then pass it to the next tube.
  *
  * <p>
  * There would be a {@link Tube} implementation that invokes {@link Provider}.
  * There would be a {@link Tube} implementation that invokes a service method
  * on the user's code.
  * There would be a {@link Dispatch} implementation that invokes a {@link Tube}.
  *
  * <p>
  * WS-MEX can be implemented as a {@link Tube} that looks for
  * {@link Message#getPayloadNamespaceURI()} and serves the request.
  *
  *
  *
  *
  * <h2>Tube Lifecycle</h2>
  * Pipeline is expensive to set up, so once it's created it will be reused.
  * A pipeline is not reentrant; one pipeline is used to process one request/response
  * at at time. The same pipeline instance may serve multiple request/response,
  * if one comes after another and they don't overlap.
  * <p>
  * Where a need arises to process multiple requests concurrently, a pipeline
  * gets cloned through {@link TubeCloner}. Note that this need may happen on
  * both server (because it quite often serves multiple requests concurrently)
  * and client (because it needs to support asynchronous method invocations.)
  * <p>
  * Created pipelines (including cloned ones and the original) may be discarded and GC-ed
  * at any time at the discretion of whoever owns pipelines. Tubes can, however, expect
  * at least one copy (or original) of pipeline to live at any given time while a pipeline
  * owner is interested in the given pipeline configuration (in more concerete terms,
  * for example, as long as a dispatch object lives, it's going to keep at least one
  * copy of a pipeline alive.)
  * <p>
  * Before a pipeline owner dies, it may invoke {@link #preDestroy()} on the last
  * remaining pipeline. It is "may" for pipeline owners that live in the client-side
  * of JAX-WS (such as dispatches and proxies), but it is a "must" for pipeline owners
  * that live in the server-side of JAX-WS.
  * <p>
  * This last invocation gives a chance for some pipes to clean up any state/resource
  * acquired (such as WS-RM's sequence, WS-Trust's SecurityToken), although as stated above,
  * this is not required for clients.
  *
  *
  *
  * <h2>Tube and state</h2>
  * <p>
  * The lifecycle of pipelines is designed to allow a {@link Tube} to store various
  * state in easily accessible fashion.
  *
  *
  * <h3>Per-packet state</h3>
  * <p>
  * Any information that changes from a packet to packet should be
  * stored in {@link Packet} (if such informaton is specific to your problem domain,
  * then most likely {@link Packet#invocationProperties}.)
  * This includes information like transport-specific headers.
  *
  * <h3>Per-thread state</h3>
  * <p>
  * Any expensive-to-create objects that are non-reentrant can be stored
  * either in instance variables of a {@link Tube}, or a static {@link ThreadLocal}.
  *
  * <p>
  * The first approach works, because {@link Tube} is
  * non reentrant. When a tube is copied, new instances should be allocated
  * so that two {@link Tube} instances don't share thread-unsafe resources.
  *
  * Similarly the second approach works, since {@link ThreadLocal} guarantees
  * that each thread gets its own private copy.
  *
  * <p>
  * The former is faster to access, and you need not worry about clean up.
  * On the other hand, because there can be many more concurrent requests
  * than # of threads, you may end up holding onto more resources than necessary.
  *
  * <p>
  * This includes state like canonicalizers, JAXB unmarshallers,
  * {@link SimpleDateFormat}, etc.
  *
  *
  * <h3>Per-proxy/per-endpoint state</h3>
  * <p>
  * Information that is tied to a particular proxy/dispatch can be stored
  * in a separate object that is referenced from a tube. When
  * a new tube is copied, you can simply hand out a reference to the newly
  * created one, so that all copied tubes refer to the same instance.
  * See the following code as an example:
  *
  * <pre>
  * class TubeImpl {
  *   // this object stores per-proxy state
  *   class DataStore {
  *     int counter;
  *   }
  *
  *   private DataStore ds;
  *
  *   // create a fresh new pipe
  *   public TubeImpl(...) {
  *     ....
  *     ds = new DataStore();
  *   }
  *
  *   // copy constructor
  *   private TubeImpl(TubeImpl that, PipeCloner cloner) {
  *     cloner.add(that,this);
  *     ...
  *     this.ds = that.ds;
  *   }
  *
  *   public TubeImpl copy(PipeCloner pc) {
  *     return new TubeImpl(this,pc);
  *   }
  * }
  * </pre>
  *
  * <p>
  * Note that access to such resource may need to be synchronized,
  * since multiple copies of pipelines may execute concurrently.
  *
  *
  *
  * <h3>VM-wide state</h3>
  * <p>
  * <tt>static</tt> is always there for you to use.
  *
  *
  *
  * @see AbstractTubeImpl
  * @see AbstractFilterTubeImpl
  *
  * @author Kohsuke Kawaguchi
  * @author Jitendra Kotamraju
  */
 public interface Tube {
     /**
      * Acts on a request and perform some protocol specific operation.
      *
      * TODO: exception handling semantics need more discussion
      *
      * @throws WebServiceException
      *      On the server side, this signals an error condition where
      *      a fault reply is in order (or the exception gets eaten by
      *      the top-most transport {@link Adapter} if it's one-way.)
      *      This frees each {@link Tube} from try/catching a
      *      {@link WebServiceException} in every layer.
      *
      *      Note that this method is also allowed to return
      *      {@link NextAction#returnWith(Packet)} with
      *      a {@link Packet} that has a fault as the payload.
      *
      *      <p>
      *      On the client side, the {@link WebServiceException} thrown
      *      will be propagated all the way back to the calling client
      *      applications. (The consequence of that is that if you are
      *      a filtering {@link Tube}, you must not eat the exception
      *      that was given to {@link #processException(Throwable)} .
      *
      * @throws RuntimeException
      *      Other runtime exception thrown by this method must
      *      be treated as a bug in the tube implementation,
      *      and therefore should not be converted into a fault.
      *      (Otherwise it becomes very difficult to debug implementation
      *      problems.)
      *
      *      <p>
      *      On the server side, this exception should be most likely
      *      just logged. On the client-side it gets propagated to the
      *      client application.
      *
      *      <p>
      *      The consequence of this is that if a pipe calls
      *      into an user application (such as {@link SOAPHandler}
      *      or {@link LogicalHandler}), where a {@link RuntimeException}
      *      is *not* a bug in the JAX-WS implementation, it must be catched
      *      and wrapped into a {@link WebServiceException}.
      *
      * @param request
      *      The packet that represents a request message.
      *      If the packet has a non-null message, it must be a valid
      *      unconsumed {@link Message}. This message represents the
      *      SOAP message to be sent as a request.
      *      <p>
      *      The packet is also allowed to carry no message, which indicates
      *      that this is an output-only request.
      *      (that's called "solicit", right? - KK)
      *
      * @return
      *      A {@link NextAction} object that represents the next action
      *      to be taken by the JAX-WS runtime.
      */
     @NotNull NextAction processRequest(@NotNull Packet request);
     /**
      * Acts on a response and performs some protocol specific operation.
      *
      * <p>
      * Once a {@link #processRequest(Packet)} is invoked, this method
      * will be always invoked with the response, before this {@link Tube}
      * processes another request.
      *
      * @param response
      *      If the packet has a non-null message, it must be
      *      a valid unconsumed {@link Message}. This message represents
      *      a response to the request message passed to
      *      {@link #processRequest(Packet)} earlier.
      *      <p>
      *      The packet is also allowed to carry no message, which indicates
      *      that there was no response. This is used for things like
      *      one-way message and/or one-way transports.
      *
      * TODO: exception handling semantics need more discussion
      *
      * @return
      *      A {@link NextAction} object that represents the next action
      *      to be taken by the JAX-WS runtime.
      */
     @NotNull NextAction processResponse(@NotNull Packet response);
     /**
      * Acts on a exception and performs some clean up operations.
      *
      * <p>
      * If a {@link #processRequest(Packet)}, {@link #processResponse(Packet)},
      * {@link #processException(Throwable)} throws an exception, this method
      * will be always invoked on all the {@link Tube}s in the remaining
      * {@link NextAction}s.
      *
      * <p>
      * On the server side, the {@link Throwable} thrown will be propagated to the
      * top-most transport. The transport converts the exception to fault reply or
      * simply logs in case of one-way MEP. If you are a filtering {@link Tube} like
      * {@link AbstractTubeImpl}, you don't have to override the implementation). On
      * the other hand, any intermediate {@link Tube} may want to convert the exception
      * to a fault message.
      *
      * <p>
      * On the client side, the {@link Throwable} thrown
      * will be propagated all the way back to the calling client
      * applications. (The consequence of that is that if you are
      * a filtering {@link Tube} like {@link AbstractTubeImpl}, you don't have to
      * override the implementation)
      *
      * @param t
      *
      * @return
      *      A {@link NextAction} object that represents the next action
      *      to be taken by the JAX-WS runtime.
      */
     @NotNull NextAction processException(@NotNull Throwable t);
     /**
      * Invoked before the last copy of the pipeline is about to be discarded,
      * to give {@link Tube}s a chance to clean up any resources.
      *
      * <p>
      * This can be used to invoke {@link PreDestroy} lifecycle methods
      * on user handler. The invocation of it is optional on the client side,
      * but mandatory on the server side.
      *
      * <p>
      * When multiple copies of pipelines are created, this method is called
      * only on one of them.
      *
      * @throws WebServiceException
      *      If the clean up fails, {@link WebServiceException} can be thrown.
      *      This exception will be propagated to users (if this is client),
      *      or recorded (if this is server.)
      */
     void preDestroy();
     /**
      * Creates an identical clone of this {@link Tube}.
      *
      * <p>
      * This method creates an identical pipeline that can be used
      * concurrently with this pipeline. When the caller of a pipeline
      * is multi-threaded and need concurrent use of the same pipeline,
      * it can do so by creating copies through this method.
      *
      * <h3>Implementation Note</h3>
      * <p>
      * It is the implementation's responsibility to call
      * {@link TubeCloner#add(Tube,Tube)} to register the copied pipe
      * with the original. This is required before you start copying
      * the other {@link Tube} references you have, or else there's a
      * risk of infinite recursion.
      * <p>
      * For most {@link Tube} implementations that delegate to another
      * {@link Tube}, this method requires that you also copy the {@link Tube}
      * that you delegate to.
      * <p>
      * For limited number of {@link Tube}s that do not maintain any
      * thread unsafe resource, it is allowed to simply return <tt>this</tt>
      * from this method (notice that even if you are stateless, if you
      * got a delegating {@link Tube} and that one isn't stateless, you
      * still have to copy yourself.)
      *
      * <p>
      * Note that this method might be invoked by one thread while another
      * thread is executing the other process method. See
      * the {@link Codec#copy()} for more discussion about this.
      *
      * @param cloner
      *      Use this object (in particular its {@link TubeCloner#copy(Tube)} method
      *      to clone other pipe references you have
      *      in your pipe. See {@link TubeCloner} for more discussion
      *      about why.
      *
      * @return
      *      always non-null {@link Tube}.
      */
     Tube copy(TubeCloner cloner);
 }

Mercurial > jdk8-mips64-public > jaxws / annotate

src/share/jaxws_classes/com/sun/xml/internal/ws/api/pipe/Tube.java@9c07ef4934dd (annotated)

src/share/jaxws_classes/com/sun/xml/internal/ws/api/pipe/Tube.java