Interface DesktopCtrl
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- All Known Implementing Classes:
DesktopImpl
public interface DesktopCtrl
An addition interface toDesktop
for implementation.Note: applications shall never access this interface.
- Author:
- tomyeh
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description boolean
activateServerPush(long timeout)
Activates the current thread for accessing this desktop by the server push.void
addComponent(Component comp)
Adds a component to this page.void
addPage(Page page)
Adds a page to this desktop.void
afterComponentAttached(Component comp, Page page)
void
afterComponentDetached(Component comp, Page prevpage)
void
afterComponentMoved(Component parent, Component child, Component prevparent)
void
afterProcessEvent(Event event)
Event
beforePostEvent(Event event)
Event
beforeProcessEvent(Event event)
Event
beforeSendEvent(Event event)
boolean
ceaseSuspendedThread(EventProcessingThread evtthd, java.lang.String cause)
Ceases the specified event thread.void
deactivateServerPush()
Deactivates the thread that has invokedactivateServerPush(long)
successfully.void
destroy()
Called when the desktop is about to be destroyed.boolean
enableServerPush(boolean enable, java.io.Serializable enabler)
Enable/Disable serverpush using reference counting, so that multiple enablers can use the same serverpush and deregister whenever they want.boolean
enableServerPush(ServerPush serverpush)
Enables the server-push feature with the specified server-push controller.java.lang.Object
getActivationLock()
Returns the lock used to activate an execution.Media
getDownloadMedia(java.lang.String medId, boolean reserved)
Returns the media that is associated withDesktop.getDownloadMediaURI(org.zkoss.util.media.Media, java.lang.String)
, or null if not found.java.lang.Object
getLastResponse(java.lang.String reqId)
Returns the response for the last request, or null if no response yet, or the specified request ID doesn't match the last one (passed toresponseSent(java.lang.String, java.lang.Object)
).int
getNextKey()
Returns the next available key which is unique in the whole desktop.java.lang.String
getNextUuid(Component comp)
Returns the next available UUID for a component.java.lang.String
getNextUuid(Page page)
Returns the next available UUID for a page.RequestQueue
getRequestQueue()
Returns the request queue.int
getResponseId(boolean advance)
Returns the sequence ID of the response.ServerPush
getServerPush()
Returns the server-push controller, or null if it is not enabled yet.java.util.Collection<EventProcessingThread>
getSuspendedThreads()
Returns a collection of suspended event processing threads, or empty if no suspended thread at all.Visualizer
getVisualizer()
Returns the visualizer associated with this desktop.void
invokeDesktopCleanups()
InvokesDesktopCleanup.cleanup(org.zkoss.zk.ui.Desktop)
for each relevant listener registered byDesktop.addListener(java.lang.Object)
.void
invokeExecutionCleanups(Execution exec, Execution parent, java.util.List<java.lang.Throwable> errs)
InvokesExecutionCleanup.cleanup(org.zkoss.zk.ui.Execution, org.zkoss.zk.ui.Execution, java.util.List<java.lang.Throwable>)
for each relevant listener registered byDesktop.addListener(java.lang.Object)
.void
invokeExecutionInits(Execution exec, Execution parent)
InvokesExecutionInit.init(org.zkoss.zk.ui.Execution, org.zkoss.zk.ui.Execution)
for each relevant listener registered byDesktop.addListener(java.lang.Object)
.Component
mapComponent(java.lang.String uuid, Component comp)
Maps a component associated with the given UUID to this page.void
onPiggyback()
Called each time when ZK Update Engine retrieves events.void
onPiggybackListened(Component comp, boolean listen)
Called when a component added or removed a listener forEvents.ON_PIGGYBACK
.java.util.List<AuResponse>
piggyResponse(java.util.Collection<AuResponse> response, boolean reset)
Adds the responses to the so-called piggy-back queue.void
recoverDidFail(java.lang.Throwable ex)
Called when the recovering failed.void
recycle()
Called when the desktop has been recycled.boolean
removeComponent(Component comp)
Removes a component to this page.void
removePage(Page page)
Removes a page from this desktop.void
responseSent(java.lang.String reqId, java.lang.Object resInfo)
Called when ZK Update Engine has sent a response to the client.boolean
scheduledServerPush()
Returns if there is any scheduled task for server push.<T extends Event>
voidscheduleServerPush(EventListener<T> task, T event)
Schedules a task to run under the server push of the given desktop asynchronously.void
service(AuRequest request, boolean everError)
Processes an AU request.void
sessionDidActivate(Session sess)
Notification that the session, which owns this desktop, has just been activated (a.k.a., deserialized) by the Web container.void
sessionWillPassivate(Session sess)
Notification that the session, which owns this desktop, is about to be passivated (a.k.a., serialized) by the Web container.void
setExecution(Execution exec)
Sets the execution (used to represent a lock).void
setId(java.lang.String id)
Sets the desktop identifier.void
setResponseId(int resId)
Sets the sequence ID of the response.void
setVisualizer(Visualizer uv)
Sets the visualizer associated with is desktop.
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Method Detail
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getRequestQueue
RequestQueue getRequestQueue()
Returns the request queue.
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getNextKey
int getNextKey()
Returns the next available key which is unique in the whole desktop.
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getNextUuid
java.lang.String getNextUuid(Page page)
Returns the next available UUID for a page. The returned UUID is unique in the desktop. You can consider it as unique in the whole session, though it may not be true ifRawId
is used (developer's responsibility to avoid conflict), integer overflow (too many UUID in one session, which can be considered as impossible), or a custom ID generator (IdGenerator
) is used.- Since:
- 5.0.3
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getNextUuid
java.lang.String getNextUuid(Component comp)
Returns the next available UUID for a component. The returned UUID is unique in the desktop. You can consider it as unique in the whole session, though it may not be true ifRawId
is used (developer's responsibility to avoid conflict), integer overflow (too many UUID in one session, which can be considered as impossible), or a custom ID generator (IdGenerator
) is used.- Since:
- 5.0.3
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addComponent
void addComponent(Component comp)
Adds a component to this page.It is used internally and developers shall not invoke it explicityly.
- Throws:
java.lang.InternalError
- if there is a component associated with the same UUID
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mapComponent
Component mapComponent(java.lang.String uuid, Component comp)
Maps a component associated with the given UUID to this page. Notice that the given uuid can be different from comp's UUID (Component.getUuid()
).If the given component is null, the mapping of UUID is removed.
Unlike
addComponent(org.zkoss.zk.ui.Component)
andremoveComponent(org.zkoss.zk.ui.Component)
, this method simply replaces the mapping if the given UUID is already mapped to the other component.It is used internally and developers shall not invoke it explicitly.
- Parameters:
comp
- the component to associate with the given UUID. If not, the association (i.e., mapping) is removed.- Returns:
- the previous component that was associated with the given UUID.
- Since:
- 6.0.0
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removeComponent
boolean removeComponent(Component comp)
Removes a component to this page.It is used internally and developers shall not invoke it explicitly.
- Returns:
- false always since 10.0.0 (Deprecated:
whether UUID is recycled. If true, the caller shall reset UUID of the give component.) - Since:
- 5.0.4
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addPage
void addPage(Page page)
Adds a page to this desktop. It must be called when a page is created.This is one of the only few method you could access before activating an execution.
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removePage
void removePage(Page page)
Removes a page from this desktop.NOTE: once a page is removed, you can NOT add it back. You shall just GC it.
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setId
void setId(java.lang.String id)
Sets the desktop identifier.It is callable only if it is the recovering phase, i.e.,
ExecutionCtrl.isRecovering()
is true. In other words, callable only in the invocation ofFailoverManager.recover(org.zkoss.zk.ui.Session, org.zkoss.zk.ui.Execution, org.zkoss.zk.ui.Desktop)
.- Throws:
java.lang.IllegalStateException
- if it is NOT in recovering.
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recoverDidFail
void recoverDidFail(java.lang.Throwable ex)
Called when the recovering failed.
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sessionWillPassivate
void sessionWillPassivate(Session sess)
Notification that the session, which owns this desktop, is about to be passivated (a.k.a., serialized) by the Web container.
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sessionDidActivate
void sessionDidActivate(Session sess)
Notification that the session, which owns this desktop, has just been activated (a.k.a., deserialized) by the Web container.
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destroy
void destroy()
Called when the desktop is about to be destroyed.
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recycle
void recycle()
Called when the desktop has been recycled. More precisely, it is called when the desktop is no longer used and ready to be re-used later.- Since:
- 5.0.7
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getSuspendedThreads
java.util.Collection<EventProcessingThread> getSuspendedThreads()
Returns a collection of suspended event processing threads, or empty if no suspended thread at all.An event processing thread is an instance of
EventProcessingThread
Note: if you access this method NOT in an event listener for the SAME desktop, you have to synchronize the iteration (though the returned collection is synchronized). Of course, it is always safe to test whether it is empty (
Collection.isEmpty()
).//Use the following pattern IF it is not in the SAME desktop's listener Collection c = otherDesktop.getSuspendedThreads(); if (c.isEmpty()) { //do something accordingly } else { synchronized (c) { for (Iterator it = c.iterator(); it.hasNext();) { //... } } }
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ceaseSuspendedThread
boolean ceaseSuspendedThread(EventProcessingThread evtthd, java.lang.String cause)
Ceases the specified event thread.- Parameters:
cause
- an arbitrary text to describe the cause. It will be the message of the thrown InterruptedException.- Returns:
- true if the event processing thread is ceased successfully; false if no such thread or it is not suspended.
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getDownloadMedia
Media getDownloadMedia(java.lang.String medId, boolean reserved)
Returns the media that is associated withDesktop.getDownloadMediaURI(org.zkoss.util.media.Media, java.lang.String)
, or null if not found.This method is used internally. Developers rarely need to access this method.
- Parameters:
reserved
- reserved for future use.- Returns:
- the media or null if not found.
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onPiggybackListened
void onPiggybackListened(Component comp, boolean listen)
Called when a component added or removed a listener forEvents.ON_PIGGYBACK
.The implementation usually uses it to optimize whether to call the listener when
onPiggyback()
is called.- Parameters:
comp
- the component that adds an listener forEvents.ON_PIGGYBACK
. The component may or may not be a root component.listen
- whether the listener is added (or removed).- Since:
- 3.0.0
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onPiggyback
void onPiggyback()
Called each time when ZK Update Engine retrieves events. It is used to implement the piggyback feature by posting the events (seeEvents.ON_PIGGYBACK
). The implementation could post events here. It should not process event here (since event thread might be used).Used only internally. Application developers shall not call it.
- Since:
- 3.0.0
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getServerPush
ServerPush getServerPush()
Returns the server-push controller, or null if it is not enabled yet.
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enableServerPush
boolean enableServerPush(ServerPush serverpush)
Enables the server-push feature with the specified server-push controller. If you want to use the default serverpush, useDesktop.enableServerPush(boolean)
instead. This method allows the caller to provide a server push for more control.Example:
desktop.enableServerPush(new PollingServerPush(1000,6000,5));
Notice: a server push controller can be used in one desktop. It cannot be shared.
- Parameters:
serverpush
- the server-push controller. If null, the server-push feature is disabled (for this desktop). Note: this method will invokeServerPush.start(org.zkoss.zk.ui.Desktop)
, so the caller doesn't need to do it.- Since:
- 3.0.0
- See Also:
Desktop.enableServerPush(boolean)
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enableServerPush
boolean enableServerPush(boolean enable, java.io.Serializable enabler)
Enable/Disable serverpush using reference counting, so that multiple enablers can use the same serverpush and deregister whenever they want.- Parameters:
enable
- true/false enable/disable serverpushenabler
- the same reference must be used to disable again- Returns:
- Currently only used by
DesktopEventQueue
to enable several eventqueues to use the sameServerPush
- Since:
- 6.5.4
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beforeSendEvent
Event beforeSendEvent(Event event)
InvokesEventInterceptor.beforeSendEvent(org.zkoss.zk.ui.event.Event)
registered byDesktop.addListener(java.lang.Object)
.Note: it invokes
Configuration.beforeSendEvent(org.zkoss.zk.ui.event.Event)
automatically.- Since:
- 3.0.0
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beforePostEvent
Event beforePostEvent(Event event)
InvokesEventInterceptor.beforePostEvent(org.zkoss.zk.ui.event.Event)
registered byDesktop.addListener(java.lang.Object)
.Note: it invokes
Configuration.beforePostEvent(org.zkoss.zk.ui.event.Event)
automatically.- Since:
- 3.0.0
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beforeProcessEvent
Event beforeProcessEvent(Event event) throws java.lang.Exception
InvokesEventInterceptor.beforeProcessEvent(org.zkoss.zk.ui.event.Event)
registered byDesktop.addListener(java.lang.Object)
.Note: it invokes
Configuration.beforeProcessEvent(org.zkoss.zk.ui.event.Event)
automatically.- Throws:
java.lang.Exception
- Since:
- 3.0.0
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afterProcessEvent
void afterProcessEvent(Event event) throws java.lang.Exception
InvokesEventInterceptor.afterProcessEvent(org.zkoss.zk.ui.event.Event)
registered byDesktop.addListener(java.lang.Object)
.Note: it invokes
Configuration.afterProcessEvent(org.zkoss.zk.ui.event.Event)
automatically.- Throws:
java.lang.Exception
- Since:
- 3.0.0
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invokeDesktopCleanups
void invokeDesktopCleanups()
InvokesDesktopCleanup.cleanup(org.zkoss.zk.ui.Desktop)
for each relevant listener registered byDesktop.addListener(java.lang.Object)
.Used only internally.
It never throws an exception.
- Since:
- 3.0.6
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invokeExecutionInits
void invokeExecutionInits(Execution exec, Execution parent) throws UiException
InvokesExecutionInit.init(org.zkoss.zk.ui.Execution, org.zkoss.zk.ui.Execution)
for each relevant listener registered byDesktop.addListener(java.lang.Object)
.Used only internally.
- Parameters:
exec
- the execution that is createdparent
- the previous execution, or null if no previous at all- Throws:
UiException
- to prevent an execution from being created- Since:
- 3.0.6
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invokeExecutionCleanups
void invokeExecutionCleanups(Execution exec, Execution parent, java.util.List<java.lang.Throwable> errs)
InvokesExecutionCleanup.cleanup(org.zkoss.zk.ui.Execution, org.zkoss.zk.ui.Execution, java.util.List<java.lang.Throwable>)
for each relevant listener registered byDesktop.addListener(java.lang.Object)
.Used only internally.
It never throws an exception but logs and adds it to the errs argument, if not null.
- Parameters:
exec
- the execution that is being destroyedparent
- the previous execution, or null if no previous at allerrs
- a list of exceptions (java.lang.Throwable) if any exception occurred before this method is called, or null if no exception at all. Note: you can manipulate the list directly to add or clean up exceptions. For example, if exceptions are fixed correctly, you can call errs.clear() such that no error message will be displayed at the client.- Since:
- 3.0.6
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afterComponentMoved
void afterComponentMoved(Component parent, Component child, Component prevparent)
- Parameters:
prevparent
- the previous parent. If it is the same as comp'sComponent.getParent()
, comp is moved in the same parent.- Since:
- 3.0.6
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responseSent
void responseSent(java.lang.String reqId, java.lang.Object resInfo)
Called when ZK Update Engine has sent a response to the client.- Parameters:
reqId
- the request ID that the response is generated for. Ignore if null.resInfo
- the response. Ignored if reqId is null.- Since:
- 5.0.0
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getLastResponse
java.lang.Object getLastResponse(java.lang.String reqId)
Returns the response for the last request, or null if no response yet, or the specified request ID doesn't match the last one (passed toresponseSent(java.lang.String, java.lang.Object)
).The return value is the value passed to resInfo when calling
responseSent(java.lang.String, java.lang.Object)
.- Since:
- 5.0.0
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getResponseId
int getResponseId(boolean advance)
Returns the sequence ID of the response. The client and server uses the sequence ID to make sure the responses are processed in the correct order.The range of the sequence IDs is 1~999.
- Parameters:
advance
- whether to advance the number before returning. If true, the ID is increased and then returned. If false, the previous value is returned- Since:
- 3.5.0
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setResponseId
void setResponseId(int resId)
Sets the sequence ID of the response.It is rarely called other than in the recovering mode, i.e.,
ExecutionCtrl.isRecovering()
is true.- Parameters:
resId
- a value between 1 and 999. You can reset the ID by passing a non-positive value.- Since:
- 3.5.0
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piggyResponse
java.util.List<AuResponse> piggyResponse(java.util.Collection<AuResponse> response, boolean reset)
Adds the responses to the so-called piggy-back queue. The responses in the piggy-back queue will be sent in the next AU request.This method is useful for working thread that wants to sent the responses back to the client. A typical example is the Comet-based server push.
- Parameters:
response
- the responses to be appended to the piggy-back queue.reset
- whether to reset the piggy-back queue after returning the queued responses.- Returns:
- all responses in the piggy-back queue, or null if nothing in the queue.
- Since:
- 5.0.0
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scheduleServerPush
<T extends Event> void scheduleServerPush(EventListener<T> task, T event)
Schedules a task to run under the server push of the given desktop asynchronously. It is called byExecutions.schedule(org.zkoss.zk.ui.Desktop, org.zkoss.zk.ui.event.EventListener<T>, T)
. Don't call it directly.Like
activateServerPush(long)
anddeactivateServerPush()
, this method could be called in any thread, so the implementation of this method has to be safe for concurrent access.- Parameters:
task
- the task to executeevent
- the event to be passed to the task (i.e., the event listener). It could null or any instance as long as the task recognizes it.- Throws:
java.lang.IllegalStateException
- if the server push is not enabled.DesktopUnavailableException
- if the desktop is removed (when activating).- Since:
- 5.0.6
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scheduledServerPush
boolean scheduledServerPush()
Returns if there is any scheduled task for server push.- Since:
- 5.0.6
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activateServerPush
boolean activateServerPush(long timeout) throws java.lang.InterruptedException
Activates the current thread for accessing this desktop by the server push. It is called byExecutions.activate(org.zkoss.zk.ui.Desktop)
. Don't call it directly.Like
scheduleServerPush(org.zkoss.zk.ui.event.EventListener<T>, T)
, this method could be called in any thread, so it has to be safe for concurrent access.Note: the server push must be enabled first (by use of
Desktop.enableServerPush(boolean)
).- Parameters:
timeout
- the maximum time to wait in milliseconds. Ignored (i.e., never timeout) if non-positive.- Throws:
java.lang.IllegalStateException
- if the server push is not enabled.java.lang.InterruptedException
- Since:
- 3.5.2
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deactivateServerPush
void deactivateServerPush()
Deactivates the thread that has invokedactivateServerPush(long)
successfully. It is called byExecutions.deactivate(org.zkoss.zk.ui.Desktop)
. Don't call it directly.- Since:
- 3.5.2
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service
void service(AuRequest request, boolean everError)
Processes an AU request. Notice that not only the requests for a desktop but also the requests for any component in the desktop will go thru this method.To override the default processing, register an AU request service
AuService
by invokingDesktop.addListener(java.lang.Object)
.- This method first invokes the registered AU request service
(
AuService
) one-by-one, until the first one returns true. - If none of them returns true or no AU service at all,
it checks if the request is targeting a component
(i.e.,
AuRequest.getComponent()
is not null). - If it is targeting a component, it invokes
ComponentCtrl.service(org.zkoss.zk.au.AuRequest, boolean)
to handle the service. - If it is not targeting a component (i.e., targeting to
this desktop), it handles as follows.
- It handles the recognized requests, including onBookmarkChange, onURIChange and onClientInfo.
- If the request is not one of above, it converts the request to
an event (by
Event.getEvent(org.zkoss.zk.au.AuRequest)
) and then posts the event (byEvents.postEvent(org.zkoss.zk.ui.event.Event)
).
Notice that the registered AU request service (
AuService
) will be called, no matter the request is targeting a component or a desktop. And, it can 'intercept' or 'filter' it by returning false.To send responses to the client, use
AbstractComponent.smartUpdate(java.lang.String, java.lang.Object)
,AbstractComponent.response(org.zkoss.zk.au.AuResponse)
orComponent.invalidate()
.If you want to intercept events, you can register a listener implementing
EventInterceptor
, or overridingafterProcessEvent(org.zkoss.zk.ui.event.Event)
.- Parameters:
everError
- if any error ever occurred before processing this request. In other words, indicates if the previous request causes any exception.- Since:
- 5.0.0
- This method first invokes the registered AU request service
(
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setExecution
void setExecution(Execution exec)
Sets the execution (used to represent a lock).Used only to implement
UiEngine
.
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getVisualizer
Visualizer getVisualizer()
Returns the visualizer associated with this desktop.Used only to implement
UiEngine
.- Since:
- 3.6.2
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setVisualizer
void setVisualizer(Visualizer uv)
Sets the visualizer associated with is desktop.Used only to implement
UiEngine
.- Since:
- 3.6.2
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getActivationLock
java.lang.Object getActivationLock()
Returns the lock used to activate an execution. Before callingsetVisualizer(org.zkoss.zk.ui.sys.Visualizer)
, this object returned by this method must be locked first.Used only to implement
UiEngine
.- Since:
- 3.6.2
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