LifecycleBase (Apache Tomcat 8.0.53 API Documentation)

java.lang.Object
- org.apache.catalina.util.LifecycleBase

All Implemented Interfaces:

Lifecycle

Direct Known Subclasses:

AbstractResourceSet, EmptyResourceSet, LifecycleMBeanBase, SessionIdGeneratorBase, StandardPipeline, StoreBase
```
public abstract class LifecycleBase
extends java.lang.Object
implements Lifecycle
```
Base implementation of the Lifecycle interface that implements the state transition rules for Lifecycle.start() and Lifecycle.stop()

Nested Class Summary
- Nested classes/interfaces inherited from interface org.apache.catalina.Lifecycle
  Lifecycle.SingleUse

Field Summary
- 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 and Description

LifecycleBase()

Constructors
Constructor and Description
`LifecycleBase()`

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`addLifecycleListener(LifecycleListener listener)` Add a LifecycleEvent listener to this component.
`void`	`destroy()` Prepare to discard the object.
`protected abstract void`	`destroyInternal()`
`LifecycleListener[]`	`findLifecycleListeners()` Get the life cycle listeners associated with this life cycle.
`protected void`	`fireLifecycleEvent(java.lang.String type, java.lang.Object data)` Allow sub classes to fire `Lifecycle` events.
`LifecycleState`	`getState()` Obtain the current state of the source component.
`java.lang.String`	`getStateName()` Obtain a textual representation of the current component state.
`void`	`init()` Prepare the component for starting.
`protected abstract void`	`initInternal()`
`void`	`removeLifecycleListener(LifecycleListener listener)` Remove a LifecycleEvent listener from this component.
`protected void`	`setState(LifecycleState state)` Provides a mechanism for sub-classes to update the component state.
`protected void`	`setState(LifecycleState state, java.lang.Object data)` Provides a mechanism for sub-classes to update the component state.
`void`	`start()` Prepare for the beginning of active use of the public methods other than property getters/setters and life cycle methods of this component.
`protected abstract void`	`startInternal()` Sub-classes must ensure that the state is changed to `LifecycleState.STARTING` during the execution of this method.
`void`	`stop()` Gracefully terminate the active use of the public methods other than property getters/setters and life cycle methods of this component.
`protected abstract void`	`stopInternal()` Sub-classes must ensure that the state is changed to `LifecycleState.STOPPING` during the execution of this method.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - LifecycleBase
```
public LifecycleBase()
```
- Method Detail
  - addLifecycleListener
```
public void addLifecycleListener(LifecycleListener listener)
```
    Add a LifecycleEvent listener to this component.
    
    Specified by:
    
    addLifecycleListener in interface Lifecycle
    
    Parameters:
    listener - The listener to add
  - findLifecycleListeners
```
public LifecycleListener[] findLifecycleListeners()
```
    Get the life cycle listeners associated with this life cycle.
    
    Specified by:
    
    findLifecycleListeners in interface Lifecycle
    
    Returns:
    An array containing the life cycle listeners associated with this life cycle. If this component has no listeners registered, a zero-length array is returned.
  - removeLifecycleListener
```
public void removeLifecycleListener(LifecycleListener listener)
```
    Remove a LifecycleEvent listener from this component.
    
    Specified by:
    
    removeLifecycleListener in interface Lifecycle
    
    Parameters:
    listener - The listener to remove
  - fireLifecycleEvent
```
protected void fireLifecycleEvent(java.lang.String type,
                      java.lang.Object data)
```
    Allow sub classes to fire Lifecycle events.
    
    Parameters:
    type - Event type
    data - Data associated with event.
  - init
```
public final void init()
                throws LifecycleException
```
    Description copied from interface: Lifecycle
    Prepare the component for starting. This method should perform any initialization required post object creation. The following LifecycleEvents will be fired in the following order:
    1. INIT_EVENT: On the successful completion of component initialization.
    Specified by:
    
    init in interface Lifecycle
    
    Throws:
    
    LifecycleException - if this component detects a fatal error that prevents this component from being used
  - initInternal
```
protected abstract void initInternal()
                              throws LifecycleException
```
    Throws:
    
    LifecycleException
  - start
```
public final void start()
                 throws LifecycleException
```
    Prepare for the beginning of active use of the public methods other than property getters/setters and life cycle methods of this component. This method should be called before any of the public methods other than property getters/setters and life cycle methods of this component are utilized. The following LifecycleEvents will be fired in the following order:
    1. BEFORE_START_EVENT: At the beginning of the method. It is as this point the state transitions to LifecycleState.STARTING_PREP.
    2. START_EVENT: During the method once it is safe to call start() for any child components. It is at this point that the state transitions to LifecycleState.STARTING and that the public methods other than property getters/setters and life cycle methods may be used.
    3. AFTER_START_EVENT: At the end of the method, immediately before it returns. It is at this point that the state transitions to LifecycleState.STARTED.
    Specified by:
    
    start in interface Lifecycle
    
    Throws:
    
    LifecycleException - if this component detects a fatal error that prevents this component from being used
  - startInternal
```
protected abstract void startInternal()
                               throws LifecycleException
```
    Sub-classes must ensure that the state is changed to LifecycleState.STARTING during the execution of this method. Changing state will trigger the Lifecycle.START_EVENT event. If a component fails to start it may either throw a LifecycleException which will cause it's parent to fail to start or it can place itself in the error state in which case stop() will be called on the failed component but the parent component will continue to start normally.
    
    Throws:
    
    LifecycleException
  - stop
```
public final void stop()
                throws LifecycleException
```
    Gracefully terminate the active use of the public methods other than property getters/setters and life cycle methods of this component. Once the STOP_EVENT is fired, the public methods other than property getters/setters and life cycle methods should not be used. The following LifecycleEvents will be fired in the following order:
    1. BEFORE_STOP_EVENT: At the beginning of the method. It is at this point that the state transitions to LifecycleState.STOPPING_PREP.
    2. STOP_EVENT: During the method once it is safe to call stop() for any child components. It is at this point that the state transitions to LifecycleState.STOPPING and that the public methods other than property getters/setters and life cycle methods may no longer be used.
    3. AFTER_STOP_EVENT: At the end of the method, immediately before it returns. It is at this point that the state transitions to LifecycleState.STOPPED.
    Note that if transitioning from LifecycleState.FAILED then the three events above will be fired but the component will transition directly from LifecycleState.FAILED to LifecycleState.STOPPING, bypassing LifecycleState.STOPPING_PREP
    Specified by:
    
    stop in interface Lifecycle
    
    Throws:
    
    LifecycleException - if this component detects a fatal error that needs to be reported
  - stopInternal
```
protected abstract void stopInternal()
                              throws LifecycleException
```
    Sub-classes must ensure that the state is changed to LifecycleState.STOPPING during the execution of this method. Changing state will trigger the Lifecycle.STOP_EVENT event.
    
    Throws:
    
    LifecycleException
  - destroy
```
public final void destroy()
                   throws LifecycleException
```
    Description copied from interface: Lifecycle
    Prepare to discard the object. The following LifecycleEvents will be fired in the following order:
    1. DESTROY_EVENT: On the successful completion of component destruction.
    Specified by:
    
    destroy in interface Lifecycle
    
    Throws:
    
    LifecycleException - if this component detects a fatal error that prevents this component from being used
  - destroyInternal
```
protected abstract void destroyInternal()
                                 throws LifecycleException
```
    Throws:
    
    LifecycleException
  - getState
```
public LifecycleState getState()
```
    Obtain the current state of the source component.
    
    Specified by:
    
    getState in interface Lifecycle
    
    Returns:
    The current state of the source component.
  - getStateName
```
public java.lang.String getStateName()
```
    Obtain a textual representation of the current component state. Useful for JMX. The format of this string may vary between point releases and should not be relied upon to determine component state. To determine component state, use Lifecycle.getState().
    
    Specified by:
    
    getStateName in interface Lifecycle
    
    Returns:
    The name of the current component state.
  - setState
```
protected void setState(LifecycleState state)
                 throws LifecycleException
```
    Provides a mechanism for sub-classes to update the component state. Calling this method will automatically fire any associated Lifecycle event. It will also check that any attempted state transition is valid for a sub-class.
    
    Parameters:
    state - The new state for this component
    
    Throws:
    
    LifecycleException
  - setState
```
protected void setState(LifecycleState state,
            java.lang.Object data)
                 throws LifecycleException
```
    Provides a mechanism for sub-classes to update the component state. Calling this method will automatically fire any associated Lifecycle event. It will also check that any attempted state transition is valid for a sub-class.
    
    Parameters:
    state - The new state for this component
    data - The data to pass to the associated Lifecycle event
    
    Throws:
    
    LifecycleException

Class LifecycleBase

Nested Class Summary

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

Field Summary

Fields inherited from interface org.apache.catalina.Lifecycle

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

LifecycleBase

Method Detail

addLifecycleListener

findLifecycleListeners

removeLifecycleListener

fireLifecycleEvent

init

initInternal

start

startInternal

stop

stopInternal

destroy

destroyInternal

getState

getStateName

setState

setState