Package org.apache.catalina.core

Class ContainerBase

java.lang.Object

org.apache.catalina.util.LifecycleBase

org.apache.catalina.util.LifecycleMBeanBase

org.apache.catalina.core.ContainerBase

All Implemented Interfaces:

MBeanRegistration, Container, JmxEnabled, Lifecycle

Direct Known Subclasses:

StandardContext, StandardEngine, StandardHost, StandardWrapper

public abstract class ContainerBase
extends LifecycleMBeanBase
implements Container

Abstract implementation of the Container interface, providing common functionality required by nearly every implementation. Classes extending this base class must may implement a replacement for invoke().

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 invoke() method of this class, utilizing the "Chain of Responsibility" design pattern. A subclass should encapsulate its own processing functionality as a Valve, and configure this Valve into the pipeline by calling setBasic().

This implementation fires property change events, per the JavaBeans design pattern, for changes in singleton properties. In addition, it fires the following ContainerEvent events to listeners who register themselves with addContainerListener():

ContainerEvents fired by this implementation

Type	Data	Description
addChild	Container	Child container added to this Container.
pipeline.addValve	Valve	Valve added to this Container.
removeChild	Container	Child container removed from this Container.
pipeline.removeValve	Valve	Valve removed from this Container.
start	null	Container was started.
stop	null	Container was stopped.

Subclasses that fire additional events should document them in the class comments of the implementation class.

Author:

Craig R. McClanahan

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	ContainerBase.ContainerBackgroundProcessor	Private runnable class to invoke the backgroundProcess method of this container and its children after a fixed delay.
protected class	ContainerBase.ContainerBackgroundProcessorMonitor

Nested classes/interfaces inherited from interface org.apache.catalina.Lifecycle

Lifecycle.SingleUse

Field Summary

Fields

Modifier and Type	Field	Description
protected AccessLog	accessLog	The access log to use for requests normally handled by this container that have been handled earlier in the processing chain.
protected int	backgroundProcessorDelay	The processor delay for this component.
protected ScheduledFuture<?>	backgroundProcessorFuture	The future allowing control of the background processor.
protected final HashMap<String,Container>	children	The child Containers belonging to this Container, keyed by name.
protected Cluster	cluster	The cluster with which this Container is associated.
protected final List<ContainerListener>	listeners	The container event listeners for this Container.
protected Log	logger	The Logger implementation with which this Container is associated.
protected String	logName	Associated logger name.
protected ScheduledFuture<?>	monitorFuture
protected String	name	The human-readable name of this Container.
protected Container	parent	The parent Container to which this Container is a child.
protected ClassLoader	parentClassLoader	The parent class loader to be configured when we install a Loader.
protected final Pipeline	pipeline	The Pipeline object with which this Container is associated.
protected static final StringManager	sm	The string manager for this package.
protected boolean	startChildren	Will children be started automatically when they are added.
protected ExecutorService	startStopExecutor
protected final PropertyChangeSupport	support	The property change support for this component.

Fields inherited from interface org.apache.catalina.Container

ADD_CHILD_EVENT, ADD_VALVE_EVENT, REMOVE_CHILD_EVENT, REMOVE_VALVE_EVENT

Fields inherited from interface org.apache.catalina.Lifecycle

AFTER_DESTROY_EVENT, AFTER_INIT_EVENT, AFTER_START_EVENT, AFTER_STOP_EVENT, BEFORE_DESTROY_EVENT, BEFORE_INIT_EVENT, BEFORE_START_EVENT, BEFORE_STOP_EVENT, CONFIGURE_START_EVENT, CONFIGURE_STOP_EVENT, PERIODIC_EVENT, START_EVENT, STOP_EVENT

Constructor Summary

Constructors

Constructor	Description
ContainerBase()

Method Summary

Modifier and Type	Method	Description
void	addChild(Container child)	Add a new child Container to those associated with this Container, if supported.
void	addContainerListener(ContainerListener listener)	Add a container event listener to this component.
void	addPropertyChangeListener(PropertyChangeListener listener)	Add a property change listener to this component.
void	addValve(Valve valve)	Convenience method, intended for use by the digester to simplify the process of adding Valves to containers.
void	backgroundProcess()	Execute a periodic task, such as reloading, etc.
protected void	destroyInternal()	Sub-classes wishing to perform additional clean-up should override this method, ensuring that super.destroyInternal() is the last call in the overriding method.
Container	findChild(String name)	Return the child Container, associated with this Container, with the specified name (if any); otherwise, return null
Container[]	findChildren()	Return the set of children Containers associated with this Container.
ContainerListener[]	findContainerListeners()	Return the set of container listeners associated with this Container.
void	fireContainerEvent(String type, Object data)	Notify all container event listeners that a particular event has occurred for this Container.
AccessLog	getAccessLog()	Obtain the AccessLog to use to log a request/response that is destined for this container.
int	getBackgroundProcessorDelay()	Get the delay between the invocation of the backgroundProcess method on this container and its children.
File	getCatalinaBase()	Obtain the location of CATALINA_BASE.
File	getCatalinaHome()	Obtain the location of CATALINA_HOME.
ObjectName[]	getChildren()
Cluster	getCluster()	Return the Cluster with which this Container is associated.
protected Cluster	getClusterInternal()
protected String	getDomainInternal()	Method implemented by sub-classes to identify the domain in which MBeans should be registered.
Log	getLogger()	Return the Logger for this Container.
String	getLogName()	Return the logger name that the container will use.
String	getMBeanKeyProperties()	Calculate the key properties string to be added to an object's ObjectName to indicate that it is associated with this container.
String	getName()	Return a name string (suitable for use by humans) that describes this Container.
Container	getParent()	Return the Container for which this Container is a child, if there is one.
ClassLoader	getParentClassLoader()	Return the parent class loader (if any) for this web application.
Pipeline	getPipeline()	Return the Pipeline object that manages the Valves associated with this Container.
Realm	getRealm()	Return the Realm with which this Container is associated.
protected Realm	getRealmInternal()
boolean	getStartChildren()	Return if children of this container will be started automatically when they are added to this container.
int	getStartStopThreads()	Obtain the number of threads available for starting and stopping any children associated with this container.
void	logAccess(Request request, Response response, long time, boolean useDefault)	Check this container for an access log and if none is found, look to the parent.
void	removeChild(Container child)	Remove an existing child Container from association with this parent Container.
void	removeContainerListener(ContainerListener listener)	Remove a container event listener from this component.
void	removePropertyChangeListener(PropertyChangeListener listener)	Remove a property change listener from this component.
void	setBackgroundProcessorDelay(int delay)	Set the delay between the invocation of the execute method on this container and its children.
void	setCluster(Cluster cluster)	Set the Cluster with which this Container is associated.
void	setName(String name)	Set a name string (suitable for use by humans) that describes this Container.
void	setParent(Container container)	Set the parent Container to which this Container is being added as a child.
void	setParentClassLoader(ClassLoader parent)	Set the parent class loader (if any) for this web application.
void	setRealm(Realm realm)	Set the Realm with which this Container is associated.
void	setStartChildren(boolean startChildren)	Set if children of this container will be started automatically when they are added to this container.
void	setStartStopThreads(int startStopThreads)	Sets the number of threads available for starting and stopping any children associated with this container.
protected void	startInternal()	Start this component and implement the requirements of LifecycleBase.startInternal().
protected void	stopInternal()	Stop this component and implement the requirements of LifecycleBase.stopInternal().
protected void	threadStart()	Start the background thread that will periodically check for session timeouts.
protected void	threadStop()	Stop the background thread that is periodically checking for session timeouts.
final String	toString()

Methods inherited from class org.apache.catalina.util.LifecycleMBeanBase

getDomain, getObjectName, getObjectNameKeyProperties, initInternal, postDeregister, postRegister, preDeregister, preRegister, register, setDomain, unregister, unregister

Methods inherited from class org.apache.catalina.util.LifecycleBase

addLifecycleListener, destroy, findLifecycleListeners, fireLifecycleEvent, getState, getStateName, getThrowOnFailure, init, removeLifecycleListener, setState, setState, setThrowOnFailure, start, stop

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.catalina.Container

getDomain, getObjectName

Methods inherited from interface org.apache.catalina.Lifecycle

addLifecycleListener, destroy, findLifecycleListeners, getState, getStateName, init, removeLifecycleListener, start, stop

Field Details

children

protected final HashMap<String,Container> children

The child Containers belonging to this Container, keyed by name.

backgroundProcessorDelay

protected int backgroundProcessorDelay

The processor delay for this component.

backgroundProcessorFuture

protected ScheduledFuture<?> backgroundProcessorFuture

The future allowing control of the background processor.

monitorFuture

protected ScheduledFuture<?> monitorFuture

listeners

protected final List<ContainerListener> listeners

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.

logger

protected Log logger

The Logger implementation with which this Container is associated.

logName

protected String logName

Associated logger name.

cluster

protected Cluster cluster

The cluster with which this Container is associated.

name

protected String name

The human-readable name of this Container.

parent

protected Container parent

The parent Container to which this Container is a child.

parentClassLoader

protected ClassLoader parentClassLoader

The parent class loader to be configured when we install a Loader.

pipeline

protected final Pipeline pipeline

The Pipeline object with which this Container is associated.

sm

protected static final StringManager sm

The string manager for this package.

startChildren

protected boolean startChildren

Will children be started automatically when they are added.

support

protected final PropertyChangeSupport support

The property change support for this component.

accessLog

protected volatile AccessLog accessLog

The access log to use for requests normally handled by this container that have been handled earlier in the processing chain.

startStopExecutor

protected ExecutorService startStopExecutor

Constructor Details

ContainerBase

public ContainerBase()

Method Details

getStartStopThreads

public int getStartStopThreads()

Description copied from interface: Container

Obtain the number of threads available for starting and stopping any children associated with this container. This allows start/stop calls to children to be processed in parallel.

Specified by:

getStartStopThreads in interface Container

Returns:

The currently configured number of threads used to start/stop children associated with this container

setStartStopThreads

public void setStartStopThreads(int startStopThreads)

Description copied from interface: Container

Sets the number of threads available for starting and stopping any children associated with this container. This allows start/stop calls to children to be processed in parallel.

Specified by:

setStartStopThreads in interface Container

Parameters:

startStopThreads - The new number of threads to be used

getBackgroundProcessorDelay

public int getBackgroundProcessorDelay()

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.

Specified by:

getBackgroundProcessorDelay in interface Container

Returns:

The delay between the invocation of the backgroundProcess method on this container and its children. A non-positive value indicates that background processing will be managed by the parent.

setBackgroundProcessorDelay

public void setBackgroundProcessorDelay(int delay)

Set the delay between the invocation of the execute method on this container and its children.

Specified by:

setBackgroundProcessorDelay in interface Container

Parameters:

delay - The delay in seconds between the invocation of backgroundProcess methods

getLogger

public Log getLogger()

Return the Logger for this Container.

Specified by:

getLogger in interface Container

Returns:

The Logger with which this Container is associated. If there is no associated Logger, return the Logger associated with the parent Container (if any); otherwise return null.

getLogName

public String getLogName()

Description copied from interface: Container

Return the logger name that the container will use.

Specified by:

getLogName in interface Container

Returns:

the abbreviated name of this container for logging messages

getCluster

public Cluster getCluster()

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 null.

Specified by:

getCluster in interface Container

Returns:

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 null.

getClusterInternal

protected Cluster getClusterInternal()

setCluster

public void setCluster(Cluster cluster)

Set the Cluster with which this Container is associated.

Specified by:

setCluster in interface Container

Parameters:

cluster - The newly associated Cluster

getName

public String getName()

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.

Specified by:

getName in interface Container

Returns:

The human readable name of this container.

setName

public void setName(String 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.

Specified by:

setName in interface Container

Parameters:

name - New name of this container

Throws:

IllegalStateException - if this Container has already been added to the children of a parent Container (after which the name may not be changed)

getStartChildren

public boolean getStartChildren()

Return if children of this container will be started automatically when they are added to this container.

Returns:

true if the children will be started

setStartChildren

public void setStartChildren(boolean startChildren)

Set if children of this container will be started automatically when they are added to this container.

Parameters:

startChildren - New value of the startChildren flag

getParent

public Container getParent()

Return the Container for which this Container is a child, if there is one. If there is no defined parent, return null.

Specified by:

getParent in interface Container

Returns:

Return the Container for which this Container is a child, if there is one. If there is no defined parent, return null.

setParent

public void setParent(Container container)

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.

Specified by:

setParent in interface Container

Parameters:

container - Container to which this Container is being added as a child

Throws:

IllegalArgumentException - if this Container refuses to become attached to the specified Container

getParentClassLoader

public ClassLoader getParentClassLoader()

Return the parent class loader (if any) for this web application. This call is meaningful only after a Loader has been configured.

Specified by:

getParentClassLoader in interface Container

Returns:

the parent class loader for this component. If not set, return Container.getParent().Container.getParentClassLoader(). If no parent has been set, return the system class loader.

setParentClassLoader

public void setParentClassLoader(ClassLoader parent)

Set the parent class loader (if any) for this web application. This call is meaningful only before a Loader has been configured, and the specified value (if non-null) should be passed as an argument to the class loader constructor.

Specified by:

setParentClassLoader in interface Container

Parameters:

parent - The new parent class loader

getPipeline

public Pipeline getPipeline()

Return the Pipeline object that manages the Valves associated with this Container.

Specified by:

getPipeline in interface Container

Returns:

The Pipeline

getRealm

public Realm getRealm()

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 null.

Specified by:

getRealm in interface Container

Returns:

The associated Realm; if there is no associated Realm, the Realm associated with the parent Container (if any); otherwise return null.

getRealmInternal

protected Realm getRealmInternal()

setRealm

public void setRealm(Realm realm)

Set the Realm with which this Container is associated.

Specified by:

setRealm in interface Container

Parameters:

realm - The newly associated Realm

addChild

public void addChild(Container child)

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 setParent() method must be called, with this Container as an argument. This method may thrown an IllegalArgumentException if this Container chooses not to be attached to the specified Container, in which case it is not added

Specified by:

addChild in interface Container

Parameters:

child - New child Container to be added

Throws:

IllegalArgumentException - if this exception is thrown by the setParent() method of the child Container

IllegalArgumentException - if the new child does not have a name unique from that of existing children of this Container

IllegalStateException - if this Container does not support child Containers

addContainerListener

public void addContainerListener(ContainerListener listener)

Add a container event listener to this component.

Specified by:

addContainerListener in interface Container

Parameters:

listener - The listener to add

addPropertyChangeListener

public void addPropertyChangeListener(PropertyChangeListener listener)

Add a property change listener to this component.

Specified by:

addPropertyChangeListener in interface Container

Parameters:

listener - The listener to add

findChild

public Container findChild(String name)

Return the child Container, associated with this Container, with the specified name (if any); otherwise, return null

Specified by:

findChild in interface Container

Parameters:

name - Name of the child Container to be retrieved

Returns:

The child Container with the given name or null if no such child exists.

findChildren

public Container[] findChildren()

Return the set of children Containers associated with this Container. If this Container has no children, a zero-length array is returned.

Specified by:

findChildren in interface Container

Returns:

An array containing all children of this container. If this Container has no children, a zero-length array is returned.

findContainerListeners

public ContainerListener[] findContainerListeners()

Return the set of container listeners associated with this Container. If this Container has no registered container listeners, a zero-length array is returned.

Specified by:

findContainerListeners in interface Container

Returns:

An array containing the container listeners associated with this Container. If this Container has no registered container listeners, a zero-length array is returned.

removeChild

public void removeChild(Container child)

Remove an existing child Container from association with this parent Container.

Specified by:

removeChild in interface Container

Parameters:

child - Existing child Container to be removed

removeContainerListener

public void removeContainerListener(ContainerListener listener)

Remove a container event listener from this component.

Specified by:

removeContainerListener in interface Container

Parameters:

listener - The listener to remove

removePropertyChangeListener

public void removePropertyChangeListener(PropertyChangeListener listener)

Remove a property change listener from this component.

Specified by:

removePropertyChangeListener in interface Container

Parameters:

listener - The listener to remove

startInternal

protected void startInternal()
                      throws LifecycleException

Start this component and implement the requirements of LifecycleBase.startInternal().

Specified by:

startInternal in class LifecycleBase

Throws:

LifecycleException - if this component detects a fatal error that prevents this component from being used

stopInternal

protected void stopInternal()
                     throws LifecycleException

Stop this component and implement the requirements of LifecycleBase.stopInternal().

Specified by:

stopInternal in class LifecycleBase

Throws:

LifecycleException - if this component detects a fatal error that prevents this component from being used

destroyInternal

protected void destroyInternal()
                        throws LifecycleException

Description copied from class: LifecycleMBeanBase

Sub-classes wishing to perform additional clean-up should override this method, ensuring that super.destroyInternal() is the last call in the overriding method.

Overrides:

destroyInternal in class LifecycleMBeanBase

Throws:

LifecycleException - If the destruction fails

logAccess

public void logAccess(Request request,
 Response response,
 long time,
 boolean useDefault)

Check this container for an access log and if none is found, look to the parent. If there is no parent and still none is found, use the NoOp access log.

Specified by:

logAccess in interface Container

Parameters:

request - Request (associated with the response) to log

response - Response (associated with the request) to log

time - Time taken to process the request/response in milliseconds (use 0 if not known)

useDefault - Flag that indicates that the request/response should be logged in the engine's default access log

getAccessLog

public AccessLog getAccessLog()

Description copied from interface: Container

Obtain the AccessLog to use to log a request/response that is destined for this container. This is typically used when the request/response was handled (and rejected) earlier in the processing chain so that the request/response still appears in the correct access logs.

Specified by:

getAccessLog in interface Container

Returns:

The AccessLog to use for a request/response destined for this container

addValve

public void addValve(Valve valve)

Convenience method, intended for use by the digester to simplify the process of adding Valves to containers. See Pipeline.addValve(Valve) for full details. Components other than the digester should use getPipeline().addValve(Valve) in case a future implementation provides an alternative method for the digester to use.

Parameters:

valve - Valve to be added

Throws:

IllegalArgumentException - if this Container refused to accept the specified Valve

IllegalArgumentException - if the specified Valve refuses to be associated with this Container

IllegalStateException - if the specified Valve is already associated with a different Container

backgroundProcess

public void backgroundProcess()

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.

Specified by:

backgroundProcess in interface Container

getCatalinaBase

public File getCatalinaBase()

Description copied from interface: Container

Obtain the location of CATALINA_BASE.

Specified by:

getCatalinaBase in interface Container

Returns:

The location of CATALINA_BASE.

getCatalinaHome

public File getCatalinaHome()

Description copied from interface: Container

Obtain the location of CATALINA_HOME.

Specified by:

getCatalinaHome in interface Container

Returns:

The location of CATALINA_HOME.

fireContainerEvent

public void fireContainerEvent(String type,
 Object data)

Notify all container event listeners that a particular event has occurred for this Container. The default implementation performs this notification synchronously using the calling thread.

Specified by:

fireContainerEvent in interface Container

Parameters:

type - Event type

data - Event data

getDomainInternal

protected String getDomainInternal()

Description copied from class: LifecycleMBeanBase

Method implemented by sub-classes to identify the domain in which MBeans should be registered.

Specified by:

getDomainInternal in class LifecycleMBeanBase

Returns:

The name of the domain to use to register MBeans.

getMBeanKeyProperties

public String getMBeanKeyProperties()

Description copied from interface: Container

Calculate the key properties string to be added to an object's ObjectName to indicate that it is associated with this container.

Specified by:

getMBeanKeyProperties in interface Container

Returns:

A string suitable for appending to the ObjectName

getChildren

public ObjectName[] getChildren()

threadStart

protected void threadStart()

Start the background thread that will periodically check for session timeouts.

threadStop

protected void threadStop()

Stop the background thread that is periodically checking for session timeouts.

toString

public final String toString()

Overrides:

toString in class Object