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
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
Subclasses that fire additional events should document them in the class comments of the implementation class.
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():
| Type | Data | Description |
|---|---|---|
addChild |
Container |
Child container added to this Container. |
|
Valve |
Valve added to this Container. |
removeChild |
Container |
Child container removed from this Container. |
|
Valve |
Valve removed from this Container. |
start |
null |
Container was started. |
stop |
null |
Container was stopped. |
- Author:
- Craig R. McClanahan
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Nested Class Summary
Nested ClassesModifier and TypeClassDescriptionprotected classPrivate runnable class to invoke the backgroundProcess method of this container and its children after a fixed delay.protected classPerform 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.Nested classes/interfaces inherited from interface org.apache.catalina.Lifecycle
Lifecycle.SingleUse -
Field Summary
FieldsModifier and TypeFieldDescriptionprotected AccessLogThe access log to use for requests normally handled by this container that have been handled earlier in the processing chain.protected intThe processor delay for this component.The child Containers belonging to this Container, keyed by name.protected ClusterThe cluster with which this Container is associated.protected final List<ContainerListener>The container event listeners for this Container.protected LogThe Logger implementation with which this Container is associated.protected StringAssociated logger name.protected StringThe human-readable name of this Container.protected ContainerThe parent Container to which this Container is a child.protected ClassLoaderThe parent class loader to be configured when we install a Loader.protected final PipelineThe Pipeline object with which this Container is associated.protected static final StringManagerThe string manager for this package.protected booleanWill children be started automatically when they are added.protected ThreadPoolExecutorprotected final PropertyChangeSupportThe property change support for this component.Fields inherited from class org.apache.catalina.util.LifecycleMBeanBase
mserverFields inherited from interface org.apache.catalina.Container
ADD_CHILD_EVENT, ADD_VALVE_EVENT, REMOVE_CHILD_EVENT, REMOVE_VALVE_EVENTFields 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 -
Method Summary
Modifier and TypeMethodDescriptionvoidAdd a new child Container to those associated with this Container, if supported.voidaddContainerListener(ContainerListener listener) Add a container event listener to this component.voidAdd a property change listener to this component.voidConvenience method, intended for use by the digester to simplify the process of adding Valves to containers.voidExecute a periodic task, such as reloading, etc.protected voidSub-classes wishing to perform additional clean-up should override this method, ensuring that super.destroyInternal() is the last call in the overriding method.Return the child Container, associated with this Container, with the specified name (if any); otherwise, returnnullReturn the set of children Containers associated with this Container.Return the set of container listeners associated with this Container.voidfireContainerEvent(String type, Object data) Notify all container event listeners that a particular event has occurred for this Container.Obtain the AccessLog to use to log a request/response that is destined for this container.intGet the delay between the invocation of the backgroundProcess method on this container and its children.Obtain the location of CATALINA_BASE.Obtain the location of CATALINA_HOME.Return the Cluster with which this Container is associated.protected Clusterprotected StringMethod implemented by sub-classes to identify the domain in which MBeans should be registered.Return the Logger for this Container.Return the logger name that the container will use.Calculate the key properties string to be added to an object'sObjectNameto indicate that it is associated with this container.getName()Return a name string (suitable for use by humans) that describes this Container.Return the Container for which this Container is a child, if there is one.Return the parent class loader (if any) for this web application.Return the Pipeline object that manages the Valves associated with this Container.getRealm()Return the Realm with which this Container is associated.protected RealmbooleanReturn if children of this container will be started automatically when they are added to this container.intObtain the number of threads available for starting and stopping any children associated with this container.protected voidSub-classes wishing to perform additional initialization should override this method, ensuring that super.initInternal() is the first call in the overriding method.voidCheck this container for an access log and if none is found, look to the parent.voidremoveChild(Container child) Remove an existing child Container from association with this parent Container.voidremoveContainerListener(ContainerListener listener) Remove a container event listener from this component.voidRemove a property change listener from this component.voidsetBackgroundProcessorDelay(int delay) Set the delay between the invocation of the execute method on this container and its children.voidsetCluster(Cluster cluster) Set the Cluster with which this Container is associated.voidSet a name string (suitable for use by humans) that describes this Container.voidSet the parent Container to which this Container is being added as a child.voidsetParentClassLoader(ClassLoader parent) Set the parent class loader (if any) for this web application.voidSet the Realm with which this Container is associated.voidsetStartChildren(boolean startChildren) Set if children of this container will be started automatically when they are added to this container.voidsetStartStopThreads(int startStopThreads) Sets the number of threads available for starting and stopping any children associated with this container.protected voidStart this component and implement the requirements ofLifecycleBase.startInternal().protected voidStop this component and implement the requirements ofLifecycleBase.stopInternal().protected voidStart the background thread that will periodically check for session timeouts.protected voidStop the background thread that is periodically checking for session timeouts.toString()Methods inherited from class org.apache.catalina.util.LifecycleMBeanBase
getDomain, getObjectName, getObjectNameKeyProperties, postDeregister, postRegister, preDeregister, preRegister, register, setDomain, unregisterMethods inherited from class org.apache.catalina.util.LifecycleBase
addLifecycleListener, destroy, findLifecycleListeners, fireLifecycleEvent, getState, getStateName, getThrowOnFailure, init, removeLifecycleListener, setState, setState, setThrowOnFailure, start, stopMethods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, waitMethods inherited from interface org.apache.catalina.Container
getDomain, getObjectNameMethods inherited from interface org.apache.catalina.Lifecycle
addLifecycleListener, destroy, findLifecycleListeners, getState, getStateName, init, removeLifecycleListener, start, stop
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Field Details
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children
The child Containers belonging to this Container, keyed by name. -
backgroundProcessorDelay
protected int backgroundProcessorDelayThe processor delay for this component. -
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
The Logger implementation with which this Container is associated. -
logName
Associated logger name. -
cluster
The cluster with which this Container is associated. -
name
The human-readable name of this Container. -
parent
The parent Container to which this Container is a child. -
parentClassLoader
The parent class loader to be configured when we install a Loader. -
pipeline
The Pipeline object with which this Container is associated. -
sm
The string manager for this package. -
startChildren
protected boolean startChildrenWill children be started automatically when they are added. -
support
The property change support for this component. -
accessLog
The access log to use for requests normally handled by this container that have been handled earlier in the processing chain. -
startStopExecutor
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Constructor Details
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ContainerBase
public ContainerBase()
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Method Details
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getStartStopThreads
public int getStartStopThreads()Description copied from interface:ContainerObtain 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:
getStartStopThreadsin interfaceContainer- Returns:
- The currently configured number of threads used to start/stop children associated with this container
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setStartStopThreads
public void setStartStopThreads(int startStopThreads) Description copied from interface:ContainerSets 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:
setStartStopThreadsin interfaceContainer- Parameters:
startStopThreads- The new number of threads to be used
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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:
getBackgroundProcessorDelayin interfaceContainer- 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.
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setBackgroundProcessorDelay
public void setBackgroundProcessorDelay(int delay) Set the delay between the invocation of the execute method on this container and its children.- Specified by:
setBackgroundProcessorDelayin interfaceContainer- Parameters:
delay- The delay in seconds between the invocation of backgroundProcess methods
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getLogger
Return the Logger for this Container. -
getLogName
Description copied from interface:ContainerReturn the logger name that the container will use.- Specified by:
getLogNamein interfaceContainer- Returns:
- the abbreviated name of this container for logging messages
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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 returnnull.- Specified by:
getClusterin interfaceContainer- 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.
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getClusterInternal
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setCluster
Set the Cluster with which this Container is associated.- Specified by:
setClusterin interfaceContainer- Parameters:
cluster- The newly associated Cluster
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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. -
setName
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:
setNamein interfaceContainer- 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)
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getStartChildren
public boolean getStartChildren()Return if children of this container will be started automatically when they are added to this container.- Returns:
trueif the children will be started
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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
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getParent
Return the Container for which this Container is a child, if there is one. If there is no defined parent, returnnull. -
setParent
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:
setParentin interfaceContainer- 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
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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:
getParentClassLoaderin interfaceContainer- 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.
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setParentClassLoader
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:
setParentClassLoaderin interfaceContainer- Parameters:
parent- The new parent class loader
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getPipeline
Return the Pipeline object that manages the Valves associated with this Container.- Specified by:
getPipelinein interfaceContainer- Returns:
- The Pipeline
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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 returnnull. -
getRealmInternal
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setRealm
Set the Realm with which this Container is associated. -
addChild
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'ssetParent()method must be called, with this Container as an argument. This method may thrown anIllegalArgumentExceptionif this Container chooses not to be attached to the specified Container, in which case it is not added- Specified by:
addChildin interfaceContainer- Parameters:
child- New child Container to be added- Throws:
IllegalArgumentException- if this exception is thrown by thesetParent()method of the child ContainerIllegalArgumentException- if the new child does not have a name unique from that of existing children of this ContainerIllegalStateException- if this Container does not support child Containers
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addContainerListener
Add a container event listener to this component.- Specified by:
addContainerListenerin interfaceContainer- Parameters:
listener- The listener to add
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addPropertyChangeListener
Add a property change listener to this component.- Specified by:
addPropertyChangeListenerin interfaceContainer- Parameters:
listener- The listener to add
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findChild
Return the child Container, associated with this Container, with the specified name (if any); otherwise, returnnull -
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:
findChildrenin interfaceContainer- Returns:
- An array containing all children of this container. If this Container has no children, a zero-length array is returned.
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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:
findContainerListenersin interfaceContainer- 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.
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removeChild
Remove an existing child Container from association with this parent Container.- Specified by:
removeChildin interfaceContainer- Parameters:
child- Existing child Container to be removed
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removeContainerListener
Remove a container event listener from this component.- Specified by:
removeContainerListenerin interfaceContainer- Parameters:
listener- The listener to remove
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removePropertyChangeListener
Remove a property change listener from this component.- Specified by:
removePropertyChangeListenerin interfaceContainer- Parameters:
listener- The listener to remove
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initInternal
Description copied from class:LifecycleMBeanBaseSub-classes wishing to perform additional initialization should override this method, ensuring that super.initInternal() is the first call in the overriding method.- Overrides:
initInternalin classLifecycleMBeanBase- Throws:
LifecycleException- If the initialisation fails
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startInternal
Start this component and implement the requirements ofLifecycleBase.startInternal().- Specified by:
startInternalin classLifecycleBase- Throws:
LifecycleException- if this component detects a fatal error that prevents this component from being used
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stopInternal
Stop this component and implement the requirements ofLifecycleBase.stopInternal().- Specified by:
stopInternalin classLifecycleBase- Throws:
LifecycleException- if this component detects a fatal error that prevents this component from being used
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destroyInternal
Description copied from class:LifecycleMBeanBaseSub-classes wishing to perform additional clean-up should override this method, ensuring that super.destroyInternal() is the last call in the overriding method.- Overrides:
destroyInternalin classLifecycleMBeanBase- Throws:
LifecycleException- If the destruction fails
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logAccess
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:
logAccessin interfaceContainer- Parameters:
request- Request (associated with the response) to logresponse- Response (associated with the request) to logtime- 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
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getAccessLog
Description copied from interface:ContainerObtain 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:
getAccessLogin interfaceContainer- Returns:
- The AccessLog to use for a request/response destined for this container
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addValve
Convenience method, intended for use by the digester to simplify the process of adding Valves to containers. SeePipeline.addValve(Valve)for full details. Components other than the digester should usegetPipeline().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 ValveIllegalArgumentException- if the specified Valve refuses to be associated with this ContainerIllegalStateException- if the specified Valve is already associated with a different Container
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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:
backgroundProcessin interfaceContainer
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getCatalinaBase
Description copied from interface:ContainerObtain the location of CATALINA_BASE.- Specified by:
getCatalinaBasein interfaceContainer- Returns:
- The location of CATALINA_BASE.
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getCatalinaHome
Description copied from interface:ContainerObtain the location of CATALINA_HOME.- Specified by:
getCatalinaHomein interfaceContainer- Returns:
- The location of CATALINA_HOME.
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fireContainerEvent
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:
fireContainerEventin interfaceContainer- Parameters:
type- Event typedata- Event data
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getDomainInternal
Description copied from class:LifecycleMBeanBaseMethod implemented by sub-classes to identify the domain in which MBeans should be registered.- Specified by:
getDomainInternalin classLifecycleMBeanBase- Returns:
- The name of the domain to use to register MBeans.
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getMBeanKeyProperties
Description copied from interface:ContainerCalculate the key properties string to be added to an object'sObjectNameto indicate that it is associated with this container.- Specified by:
getMBeanKeyPropertiesin interfaceContainer- Returns:
- A string suitable for appending to the ObjectName
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getChildren
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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
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