org.apache.catalina.valves.ValveBase Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.catalina.valves;
import java.io.IOException;
import javax.servlet.ServletException;
import org.apache.catalina.Contained;
import org.apache.catalina.Container;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.LifecycleState;
import org.apache.catalina.Pipeline;
import org.apache.catalina.Valve;
import org.apache.catalina.comet.CometEvent;
import org.apache.catalina.connector.Request;
import org.apache.catalina.connector.Response;
import org.apache.catalina.mbeans.MBeanUtils;
import org.apache.catalina.util.LifecycleMBeanBase;
import org.apache.juli.logging.Log;
import org.apache.tomcat.util.res.StringManager;
/**
* Convenience base class for implementations of the Valve interface.
* A subclass MUST implement an invoke()
* method to provide the required functionality, and MAY
* implement the Lifecycle interface to provide configuration
* management and lifecycle support.
*
* @author Craig R. McClanahan
*/
public abstract class ValveBase extends LifecycleMBeanBase
implements Contained, Valve {
//------------------------------------------------------ Constructor
public ValveBase() {
this(false);
}
public ValveBase(boolean asyncSupported) {
this.asyncSupported = asyncSupported;
}
//------------------------------------------------------ Instance Variables
/**
* Does this valve support Servlet 3+ async requests?
*/
protected boolean asyncSupported;
/**
* The Container whose pipeline this Valve is a component of.
*/
protected Container container = null;
/**
* Container log
*/
protected Log containerLog = null;
/**
* Descriptive information about this Valve implementation. This value
* should be overridden by subclasses.
*/
protected static final String info =
"org.apache.catalina.core.ValveBase/1.0";
/**
* The next Valve in the pipeline this Valve is a component of.
*/
protected Valve next = null;
/**
* The string manager for this package.
*/
protected static final StringManager sm =
StringManager.getManager(Constants.Package);
//-------------------------------------------------------------- Properties
/**
* Return the Container with which this Valve is associated, if any.
*/
@Override
public Container getContainer() {
return (container);
}
@Override
public boolean isAsyncSupported() {
return asyncSupported;
}
public void setAsyncSupported(boolean asyncSupported) {
this.asyncSupported = asyncSupported;
}
/**
* Set the Container with which this Valve is associated, if any.
*
* @param container The new associated container
*/
@Override
public void setContainer(Container container) {
this.container = container;
}
/**
* Return descriptive information about this Valve implementation.
*/
@Override
public String getInfo() {
return (info);
}
/**
* Return the next Valve in this pipeline, or null if this
* is the last Valve in the pipeline.
*/
@Override
public Valve getNext() {
return (next);
}
/**
* Set the Valve that follows this one in the pipeline it is part of.
*
* @param valve The new next valve
*/
@Override
public void setNext(Valve valve) {
this.next = valve;
}
//---------------------------------------------------------- Public Methods
/**
* Execute a periodic task, such as reloading, etc. This method will be
* invoked inside the classloading context of this container. Unexpected
* throwables will be caught and logged.
*/
@Override
public void backgroundProcess() {
// NOOP by default
}
/**
* The implementation-specific logic represented by this Valve. See the
* Valve description for the normal design patterns for this method.
*
* This method MUST be provided by a subclass.
*
* @param request The servlet request to be processed
* @param response The servlet response to be created
*
* @exception IOException if an input/output error occurs
* @exception ServletException if a servlet error occurs
*/
@Override
public abstract void invoke(Request request, Response response)
throws IOException, ServletException;
/**
* Process a Comet event. This method will rarely need to be provided by
* a subclass, unless it needs to reassociate a particular object with
* the thread that is processing the request.
*
* @param request The servlet request to be processed
* @param response The servlet response to be created
*
* @exception IOException if an input/output error occurs, or is thrown
* by a subsequently invoked Valve, Filter, or Servlet
* @exception ServletException if a servlet error occurs, or is thrown
* by a subsequently invoked Valve, Filter, or Servlet
*/
@Override
public void event(Request request, Response response, CometEvent event)
throws IOException, ServletException {
// Perform the request
getNext().event(request, response, event);
}
@Override
protected void initInternal() throws LifecycleException {
super.initInternal();
containerLog = getContainer().getLogger();
}
/**
* Start this component and implement the requirements
* of {@link org.apache.catalina.util.LifecycleBase#startInternal()}.
*
* @exception LifecycleException if this component detects a fatal error
* that prevents this component from being used
*/
@Override
protected synchronized void startInternal() throws LifecycleException {
setState(LifecycleState.STARTING);
}
/**
* Stop this component and implement the requirements
* of {@link org.apache.catalina.util.LifecycleBase#stopInternal()}.
*
* @exception LifecycleException if this component detects a fatal error
* that prevents this component from being used
*/
@Override
protected synchronized void stopInternal() throws LifecycleException {
setState(LifecycleState.STOPPING);
}
/**
* Return a String rendering of this object.
*/
@Override
public String toString() {
StringBuilder sb = new StringBuilder(this.getClass().getName());
sb.append('[');
if (container == null) {
sb.append("Container is null");
} else {
sb.append(container.getName());
}
sb.append(']');
return sb.toString();
}
// -------------------- JMX and Registration --------------------
@Override
public String getObjectNameKeyProperties() {
StringBuilder name = new StringBuilder("type=Valve");
Container container = getContainer();
name.append(MBeanUtils.getContainerKeyProperties(container));
int seq = 0;
// Pipeline may not be present in unit testing
Pipeline p = container.getPipeline();
if (p != null) {
for (Valve valve : p.getValves()) {
// Skip null valves
if (valve == null) {
continue;
}
// Only compare valves in pipeline until we find this valve
if (valve == this) {
break;
}
if (valve.getClass() == this.getClass()) {
// Duplicate valve earlier in pipeline
// increment sequence number
seq ++;
}
}
}
if (seq > 0) {
name.append(",seq=");
name.append(seq);
}
String className = this.getClass().getName();
int period = className.lastIndexOf('.');
if (period >= 0) {
className = className.substring(period + 1);
}
name.append(",name=");
name.append(className);
return name.toString();
}
@Override
public String getDomainInternal() {
return MBeanUtils.getDomain(getContainer());
}
}