Class 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
    • Field Detail

      • 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.
      • 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.
      • 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.
    • Constructor Detail

      • ContainerBase

        public ContainerBase()
    • Method Detail

      • 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
      • 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
      • 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
      • 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
      • 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.