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ContainerBase.java
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ContainerBase.java
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/*
* 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.core;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.io.File;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Callable;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.Future;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import javax.management.ObjectName;
import org.apache.catalina.AccessLog;
import org.apache.catalina.Cluster;
import org.apache.catalina.Container;
import org.apache.catalina.ContainerEvent;
import org.apache.catalina.ContainerListener;
import org.apache.catalina.Context;
import org.apache.catalina.Engine;
import org.apache.catalina.Globals;
import org.apache.catalina.Host;
import org.apache.catalina.Lifecycle;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.LifecycleState;
import org.apache.catalina.Loader;
import org.apache.catalina.Pipeline;
import org.apache.catalina.Realm;
import org.apache.catalina.Valve;
import org.apache.catalina.Wrapper;
import org.apache.catalina.connector.Request;
import org.apache.catalina.connector.Response;
import org.apache.catalina.util.ContextName;
import org.apache.catalina.util.LifecycleMBeanBase;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.ExceptionUtils;
import org.apache.tomcat.util.res.StringManager;
/**
* Abstract implementation of the <b>Container</b> interface, providing common
* functionality required by nearly every implementation. Classes extending
* this base class must may implement a replacement for <code>invoke()</code>.
* <p>
* All subclasses of this abstract base class will include support for a
* Pipeline object that defines the processing to be performed for each request
* received by the <code>invoke()</code> method of this class, utilizing the
* "Chain of Responsibility" design pattern. A subclass should encapsulate its
* own processing functionality as a <code>Valve</code>, and configure this
* Valve into the pipeline by calling <code>setBasic()</code>.
* <p>
* This implementation fires property change events, per the JavaBeans design
* pattern, for changes in singleton properties. In addition, it fires the
* following <code>ContainerEvent</code> events to listeners who register
* themselves with <code>addContainerListener()</code>:
* <table border=1>
* <tr>
* <th>Type</th>
* <th>Data</th>
* <th>Description</th>
* </tr>
* <tr>
* <td align=center><code>addChild</code></td>
* <td align=center><code>Container</code></td>
* <td>Child container added to this Container.</td>
* </tr>
* <tr>
* <td align=center><code>addValve</code></td>
* <td align=center><code>Valve</code></td>
* <td>Valve added to this Container.</td>
* </tr>
* <tr>
* <td align=center><code>removeChild</code></td>
* <td align=center><code>Container</code></td>
* <td>Child container removed from this Container.</td>
* </tr>
* <tr>
* <td align=center><code>removeValve</code></td>
* <td align=center><code>Valve</code></td>
* <td>Valve removed from this Container.</td>
* </tr>
* <tr>
* <td align=center><code>start</code></td>
* <td align=center><code>null</code></td>
* <td>Container was started.</td>
* </tr>
* <tr>
* <td align=center><code>stop</code></td>
* <td align=center><code>null</code></td>
* <td>Container was stopped.</td>
* </tr>
* </table>
* Subclasses that fire additional events should document them in the
* class comments of the implementation class.
*
* TODO: Review synchronisation around background processing. See bug 47024.
*
* @author Craig R. McClanahan
*/
public abstract class ContainerBase extends LifecycleMBeanBase
implements Container {
private static final org.apache.juli.logging.Log log=
org.apache.juli.logging.LogFactory.getLog( ContainerBase.class );
/**
* Perform addChild with the permissions of this class.
* addChild can be called with the XML parser on the stack,
* this allows the XML parser to have fewer privileges than
* Tomcat.
*/
protected class PrivilegedAddChild implements PrivilegedAction<Void> {
private final Container child;
PrivilegedAddChild(Container child) {
this.child = child;
}
@Override
public Void run() {
addChildInternal(child);
return null;
}
}
// ----------------------------------------------------- Instance Variables
/**
* The child Containers belonging to this Container, keyed by name.
*/
protected final HashMap<String, Container> children = new HashMap<>();
/**
* The processor delay for this component.
*/
protected int backgroundProcessorDelay = -1;
/**
* The container event listeners for this Container. Implemented as a
* CopyOnWriteArrayList since listeners may invoke methods to add/remove
* themselves or other listeners and with a ReadWriteLock that would trigger
* a deadlock.
*/
protected final List<ContainerListener> listeners = new CopyOnWriteArrayList<>();
/**
* The Logger implementation with which this Container is associated.
*/
protected Log logger = null;
/**
* Associated logger name.
*/
protected String logName = null;
/**
* The cluster with which this Container is associated.
*/
protected Cluster cluster = null;
private final ReadWriteLock clusterLock = new ReentrantReadWriteLock();
/**
* The human-readable name of this Container.
*/
protected String name = null;
/**
* The parent Container to which this Container is a child.
*/
protected Container parent = null;
/**
* The parent class loader to be configured when we install a Loader.
*/
protected ClassLoader parentClassLoader = null;
/**
* The Pipeline object with which this Container is associated.
*/
protected final Pipeline pipeline = new StandardPipeline(this);
/**
* The Realm with which this Container is associated.
*/
private volatile Realm realm = null;
/**
* Lock used to control access to the Realm.
*/
private final ReadWriteLock realmLock = new ReentrantReadWriteLock();
/**
* The string manager for this package.
*/
protected static final StringManager sm =
StringManager.getManager(Constants.Package);
/**
* Will children be started automatically when they are added.
*/
protected boolean startChildren = true;
/**
* The property change support for this component.
*/
protected final PropertyChangeSupport support =
new PropertyChangeSupport(this);
/**
* The background thread.
*/
private Thread thread = null;
/**
* The background thread completion semaphore.
*/
private volatile boolean threadDone = false;
/**
* The access log to use for requests normally handled by this container
* that have been handled earlier in the processing chain.
*/
protected volatile AccessLog accessLog = null;
private volatile boolean accessLogScanComplete = false;
/**
* The number of threads available to process start and stop events for any
* children associated with this container.
*/
private int startStopThreads = 1;
protected ThreadPoolExecutor startStopExecutor;
// ------------------------------------------------------------- Properties
@Override
public int getStartStopThreads() {
return startStopThreads;
}
/**
* Handles the special values.
*/
private int getStartStopThreadsInternal() {
int result = getStartStopThreads();
// Positive values are unchanged
if (result > 0) {
return result;
}
// Zero == Runtime.getRuntime().availableProcessors()
// -ve == Runtime.getRuntime().availableProcessors() + value
// These two are the same
result = Runtime.getRuntime().availableProcessors() + result;
if (result < 1) {
result = 1;
}
return result;
}
@Override
public void setStartStopThreads(int startStopThreads) {
this.startStopThreads = startStopThreads;
// Use local copies to ensure thread safety
ThreadPoolExecutor executor = startStopExecutor;
if (executor != null) {
int newThreads = getStartStopThreadsInternal();
executor.setMaximumPoolSize(newThreads);
executor.setCorePoolSize(newThreads);
}
}
/**
* Get the delay between the invocation of the backgroundProcess method on
* this container and its children. Child containers will not be invoked
* if their delay value is not negative (which would mean they are using
* their own thread). Setting this to a positive value will cause
* a thread to be spawn. After waiting the specified amount of time,
* the thread will invoke the executePeriodic method on this container
* and all its children.
*/
@Override
public int getBackgroundProcessorDelay() {
return backgroundProcessorDelay;
}
/**
* Set the delay between the invocation of the execute method on this
* container and its children.
*
* @param delay The delay in seconds between the invocation of
* backgroundProcess methods
*/
@Override
public void setBackgroundProcessorDelay(int delay) {
backgroundProcessorDelay = delay;
}
/**
* Return the Logger for this Container.
*/
@Override
public Log getLogger() {
if (logger != null)
return (logger);
logger = LogFactory.getLog(logName());
return (logger);
}
/**
* Return the Cluster with which this Container is associated. If there is
* no associated Cluster, return the Cluster associated with our parent
* Container (if any); otherwise return <code>null</code>.
*/
@Override
public Cluster getCluster() {
Lock readLock = clusterLock.readLock();
readLock.lock();
try {
if (cluster != null)
return cluster;
if (parent != null)
return parent.getCluster();
return null;
} finally {
readLock.unlock();
}
}
/*
* Provide access to just the cluster component attached to this container.
*/
protected Cluster getClusterInternal() {
Lock readLock = clusterLock.readLock();
readLock.lock();
try {
return cluster;
} finally {
readLock.unlock();
}
}
/**
* Set the Cluster with which this Container is associated.
*
* @param cluster The newly associated Cluster
*/
@Override
public void setCluster(Cluster cluster) {
Cluster oldCluster = null;
Lock writeLock = clusterLock.writeLock();
writeLock.lock();
try {
// Change components if necessary
oldCluster = this.cluster;
if (oldCluster == cluster)
return;
this.cluster = cluster;
// Stop the old component if necessary
if (getState().isAvailable() && (oldCluster != null) &&
(oldCluster instanceof Lifecycle)) {
try {
((Lifecycle) oldCluster).stop();
} catch (LifecycleException e) {
log.error("ContainerBase.setCluster: stop: ", e);
}
}
// Start the new component if necessary
if (cluster != null)
cluster.setContainer(this);
if (getState().isAvailable() && (cluster != null) &&
(cluster instanceof Lifecycle)) {
try {
((Lifecycle) cluster).start();
} catch (LifecycleException e) {
log.error("ContainerBase.setCluster: start: ", e);
}
}
} finally {
writeLock.unlock();
}
// Report this property change to interested listeners
support.firePropertyChange("cluster", oldCluster, cluster);
}
/**
* Return a name string (suitable for use by humans) that describes this
* Container. Within the set of child containers belonging to a particular
* parent, Container names must be unique.
*/
@Override
public String getName() {
return (name);
}
/**
* Set a name string (suitable for use by humans) that describes this
* Container. Within the set of child containers belonging to a particular
* parent, Container names must be unique.
*
* @param name New name of this container
*
* @exception IllegalStateException if this Container has already been
* added to the children of a parent Container (after which the name
* may not be changed)
*/
@Override
public void setName(String name) {
String oldName = this.name;
this.name = name;
support.firePropertyChange("name", oldName, this.name);
}
/**
* Return if children of this container will be started automatically when
* they are added to this container.
*/
public boolean getStartChildren() {
return (startChildren);
}
/**
* Set if children of this container will be started automatically when
* they are added to this container.
*
* @param startChildren New value of the startChildren flag
*/
public void setStartChildren(boolean startChildren) {
boolean oldStartChildren = this.startChildren;
this.startChildren = startChildren;
support.firePropertyChange("startChildren", oldStartChildren, this.startChildren);
}
/**
* Return the Container for which this Container is a child, if there is
* one. If there is no defined parent, return <code>null</code>.
*/
@Override
public Container getParent() {
return (parent);
}
/**
* Set the parent Container to which this Container is being added as a
* child. This Container may refuse to become attached to the specified
* Container by throwing an exception.
*
* @param container Container to which this Container is being added
* as a child
*
* @exception IllegalArgumentException if this Container refuses to become
* attached to the specified Container
*/
@Override
public void setParent(Container container) {
Container oldParent = this.parent;
this.parent = container;
support.firePropertyChange("parent", oldParent, this.parent);
}
/**
* Return the parent class loader (if any) for this web application.
* This call is meaningful only <strong>after</strong> a Loader has
* been configured.
*/
@Override
public ClassLoader getParentClassLoader() {
if (parentClassLoader != null)
return (parentClassLoader);
if (parent != null) {
return (parent.getParentClassLoader());
}
return (ClassLoader.getSystemClassLoader());
}
/**
* Set the parent class loader (if any) for this web application.
* This call is meaningful only <strong>before</strong> a Loader has
* been configured, and the specified value (if non-null) should be
* passed as an argument to the class loader constructor.
*
*
* @param parent The new parent class loader
*/
@Override
public void setParentClassLoader(ClassLoader parent) {
ClassLoader oldParentClassLoader = this.parentClassLoader;
this.parentClassLoader = parent;
support.firePropertyChange("parentClassLoader", oldParentClassLoader,
this.parentClassLoader);
}
/**
* Return the Pipeline object that manages the Valves associated with
* this Container.
*/
@Override
public Pipeline getPipeline() {
return (this.pipeline);
}
/**
* Return the Realm with which this Container is associated. If there is
* no associated Realm, return the Realm associated with our parent
* Container (if any); otherwise return <code>null</code>.
*/
@Override
public Realm getRealm() {
Lock l = realmLock.readLock();
try {
l.lock();
if (realm != null)
return (realm);
if (parent != null)
return (parent.getRealm());
return null;
} finally {
l.unlock();
}
}
protected Realm getRealmInternal() {
Lock l = realmLock.readLock();
try {
l.lock();
return realm;
} finally {
l.unlock();
}
}
/**
* Set the Realm with which this Container is associated.
*
* @param realm The newly associated Realm
*/
@Override
public void setRealm(Realm realm) {
Lock l = realmLock.writeLock();
try {
l.lock();
// Change components if necessary
Realm oldRealm = this.realm;
if (oldRealm == realm)
return;
this.realm = realm;
// Stop the old component if necessary
if (getState().isAvailable() && (oldRealm != null) &&
(oldRealm instanceof Lifecycle)) {
try {
((Lifecycle) oldRealm).stop();
} catch (LifecycleException e) {
log.error("ContainerBase.setRealm: stop: ", e);
}
}
// Start the new component if necessary
if (realm != null)
realm.setContainer(this);
if (getState().isAvailable() && (realm != null) &&
(realm instanceof Lifecycle)) {
try {
((Lifecycle) realm).start();
} catch (LifecycleException e) {
log.error("ContainerBase.setRealm: start: ", e);
}
}
// Report this property change to interested listeners
support.firePropertyChange("realm", oldRealm, this.realm);
} finally {
l.unlock();
}
}
// ------------------------------------------------------ Container Methods
/**
* Add a new child Container to those associated with this Container,
* if supported. Prior to adding this Container to the set of children,
* the child's <code>setParent()</code> method must be called, with this
* Container as an argument. This method may thrown an
* <code>IllegalArgumentException</code> if this Container chooses not
* to be attached to the specified Container, in which case it is not added
*
* @param child New child Container to be added
*
* @exception IllegalArgumentException if this exception is thrown by
* the <code>setParent()</code> method of the child Container
* @exception IllegalArgumentException if the new child does not have
* a name unique from that of existing children of this Container
* @exception IllegalStateException if this Container does not support
* child Containers
*/
@Override
public void addChild(Container child) {
if (Globals.IS_SECURITY_ENABLED) {
PrivilegedAction<Void> dp =
new PrivilegedAddChild(child);
AccessController.doPrivileged(dp);
} else {
addChildInternal(child);
}
}
private void addChildInternal(Container child) {
if( log.isDebugEnabled() )
log.debug("Add child " + child + " " + this);
synchronized(children) {
if (children.get(child.getName()) != null)
throw new IllegalArgumentException("addChild: Child name '" +
child.getName() +
"' is not unique");
child.setParent(this); // May throw IAE
children.put(child.getName(), child);
}
// Start child
// Don't do this inside sync block - start can be a slow process and
// locking the children object can cause problems elsewhere
if ((getState().isAvailable() ||
LifecycleState.STARTING_PREP.equals(getState())) &&
startChildren) {
try {
child.start();
} catch (LifecycleException e) {
log.error("ContainerBase.addChild: start: ", e);
throw new IllegalStateException
("ContainerBase.addChild: start: " + e);
}
}
fireContainerEvent(ADD_CHILD_EVENT, child);
}
/**
* Add a container event listener to this component.
*
* @param listener The listener to add
*/
@Override
public void addContainerListener(ContainerListener listener) {
listeners.add(listener);
}
/**
* Add a property change listener to this component.
*
* @param listener The listener to add
*/
@Override
public void addPropertyChangeListener(PropertyChangeListener listener) {
support.addPropertyChangeListener(listener);
}
/**
* Return the child Container, associated with this Container, with
* the specified name (if any); otherwise, return <code>null</code>
*
* @param name Name of the child Container to be retrieved
*/
@Override
public Container findChild(String name) {
if (name == null)
return (null);
synchronized (children) {
return children.get(name);
}
}
/**
* Return the set of children Containers associated with this Container.
* If this Container has no children, a zero-length array is returned.
*/
@Override
public Container[] findChildren() {
synchronized (children) {
Container results[] = new Container[children.size()];
return children.values().toArray(results);
}
}
/**
* Return the set of container listeners associated with this Container.
* If this Container has no registered container listeners, a zero-length
* array is returned.
*/
@Override
public ContainerListener[] findContainerListeners() {
ContainerListener[] results =
new ContainerListener[0];
return listeners.toArray(results);
}
/**
* Remove an existing child Container from association with this parent
* Container.
*
* @param child Existing child Container to be removed
*/
@Override
public void removeChild(Container child) {
if (child == null) {
return;
}
synchronized(children) {
if (children.get(child.getName()) == null)
return;
children.remove(child.getName());
}
try {
if (child.getState().isAvailable()) {
child.stop();
}
} catch (LifecycleException e) {
log.error("ContainerBase.removeChild: stop: ", e);
}
fireContainerEvent(REMOVE_CHILD_EVENT, child);
try {
// child.destroy() may have already been called which would have
// triggered this call. If that is the case, no need to destroy the
// child again.
if (!LifecycleState.DESTROYING.equals(child.getState())) {
child.destroy();
}
} catch (LifecycleException e) {
log.error("ContainerBase.removeChild: destroy: ", e);
}
}
/**
* Remove a container event listener from this component.
*
* @param listener The listener to remove
*/
@Override
public void removeContainerListener(ContainerListener listener) {
listeners.remove(listener);
}
/**
* Remove a property change listener from this component.
*
* @param listener The listener to remove
*/
@Override
public void removePropertyChangeListener(PropertyChangeListener listener) {
support.removePropertyChangeListener(listener);
}
@Override
protected void initInternal() throws LifecycleException {
BlockingQueue<Runnable> startStopQueue = new LinkedBlockingQueue<>();
startStopExecutor = new ThreadPoolExecutor(
getStartStopThreadsInternal(),
getStartStopThreadsInternal(), 10, TimeUnit.SECONDS,
startStopQueue,
new StartStopThreadFactory(getName() + "-startStop-"));
startStopExecutor.allowCoreThreadTimeOut(true);
super.initInternal();
}
/**
* 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 {
// Start our subordinate components, if any
logger = null;
getLogger();
Cluster cluster = getClusterInternal();
if ((cluster != null) && (cluster instanceof Lifecycle))
((Lifecycle) cluster).start();
Realm realm = getRealmInternal();
if ((realm != null) && (realm instanceof Lifecycle))
((Lifecycle) realm).start();
// Start our child containers, if any
Container children[] = findChildren();
List<Future<Void>> results = new ArrayList<>();
for (int i = 0; i < children.length; i++) {
results.add(startStopExecutor.submit(new StartChild(children[i])));
}
boolean fail = false;
for (Future<Void> result : results) {
try {
result.get();
} catch (Exception e) {
log.error(sm.getString("containerBase.threadedStartFailed"), e);
fail = true;
}
}
if (fail) {
throw new LifecycleException(
sm.getString("containerBase.threadedStartFailed"));
}
// Start the Valves in our pipeline (including the basic), if any
if (pipeline instanceof Lifecycle)
((Lifecycle) pipeline).start();
setState(LifecycleState.STARTING);
// Start our thread
threadStart();
}
/**
* 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 {
// Stop our thread
threadStop();
setState(LifecycleState.STOPPING);
// Stop the Valves in our pipeline (including the basic), if any
if (pipeline instanceof Lifecycle &&
((Lifecycle) pipeline).getState().isAvailable()) {
((Lifecycle) pipeline).stop();
}
// Stop our child containers, if any
Container children[] = findChildren();
List<Future<Void>> results = new ArrayList<>();
for (int i = 0; i < children.length; i++) {
results.add(startStopExecutor.submit(new StopChild(children[i])));
}
boolean fail = false;
for (Future<Void> result : results) {
try {
result.get();
} catch (Exception e) {
log.error(sm.getString("containerBase.threadedStopFailed"), e);
fail = true;
}
}
if (fail) {
throw new LifecycleException(
sm.getString("containerBase.threadedStopFailed"));
}
// Stop our subordinate components, if any
Realm realm = getRealmInternal();
if ((realm != null) && (realm instanceof Lifecycle)) {
((Lifecycle) realm).stop();
}
Cluster cluster = getClusterInternal();
if ((cluster != null) && (cluster instanceof Lifecycle)) {
((Lifecycle) cluster).stop();
}
}
@Override
protected void destroyInternal() throws LifecycleException {
Realm realm = getRealmInternal();
if ((realm != null) && (realm instanceof Lifecycle)) {