org.wso2.siddhi.core.window

Class Window

java.lang.Object

org.wso2.siddhi.core.window.Window

All Implemented Interfaces:

FindableProcessor, Snapshotable, MemoryCalculable

public class Window
extends Object
implements FindableProcessor, Snapshotable, MemoryCalculable

Window implementation of SiddhiQL. It can be seen as a global Window which can be accessed from multiple queries.

Constructor Summary

Constructors

Constructor and Description
Window(org.wso2.siddhi.query.api.definition.WindowDefinition windowDefinition, SiddhiAppContext siddhiAppContext) Construct a Window object.

Method Summary

Modifier and Type	Method and Description
void	add(ComplexEventChunk complexEventChunk) Add the given ComplexEventChunk to the Window.
CompiledCondition	compileCondition(org.wso2.siddhi.query.api.expression.Expression condition, MatchingMetaInfoHolder matchingMetaInfoHolder, SiddhiAppContext siddhiAppContext, List<VariableExpressionExecutor> variableExpressionExecutors, Map<String,Table> tableMap, String queryName) To construct a finder having the capability of finding events at the processor that corresponds to the incoming matchingEvent and the given matching expression logic.
Map<String,Object>	currentState() Return an object array containing the internal state of the internalWindowProcessor.
StreamEvent	find(StateEvent matchingEvent, CompiledCondition compiledCondition) To find events from the processor event pool, that the matches the matchingEvent based on finder logic.
String	getElementId() Return the elementId which may be used for snapshot creation.
LockWrapper	getLock()
org.wso2.siddhi.query.api.definition.WindowDefinition	getWindowDefinition() Return the WindowDefinition used to construct this Window.
void	init(Map<String,Table> tableMap, Map<String,Window> eventWindowMap, String queryName) Initialize the WindowEvent table by creating WindowProcessor to handle the events.
void	restoreState(Map<String,Object> state) Restore the internalWindowProcessor using given state.
void	setPublisher(StreamJunction.Publisher publisher) Set Publisher to which the the output events from internal window have to be sent.

Methods inherited from class java.lang.Object

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

Constructor Detail

Window

public Window(org.wso2.siddhi.query.api.definition.WindowDefinition windowDefinition,
              SiddhiAppContext siddhiAppContext)

Construct a Window object.

Parameters:

windowDefinition - definition of the window

siddhiAppContext - siddhi app context of Siddhi

Method Detail

init

public void init(Map<String,Table> tableMap,
                 Map<String,Window> eventWindowMap,
                 String queryName)

Initialize the WindowEvent table by creating WindowProcessor to handle the events.

Parameters:

tableMap - map of Tables

eventWindowMap - map of EventWindows

queryName - name of the query window belongs to.

setPublisher

public void setPublisher(StreamJunction.Publisher publisher)

Set Publisher to which the the output events from internal window have to be sent.

Parameters:

publisher - output publisher

getWindowDefinition

public org.wso2.siddhi.query.api.definition.WindowDefinition getWindowDefinition()

Return the WindowDefinition used to construct this Window.

Returns:

the window definition

add

public void add(ComplexEventChunk complexEventChunk)

Add the given ComplexEventChunk to the Window.

Parameters:

complexEventChunk - the event chunk to be added

find

public StreamEvent find(StateEvent matchingEvent,
                        CompiledCondition compiledCondition)

To find events from the processor event pool, that the matches the matchingEvent based on finder logic.

Specified by:

find in interface FindableProcessor

Parameters:

matchingEvent - the event to be matched with the events at the processor

compiledCondition - the execution element responsible for matching the corresponding events that matches the matchingEvent based on pool of events at Processor

Returns:

the matched events

compileCondition

public CompiledCondition compileCondition(org.wso2.siddhi.query.api.expression.Expression condition,
                                          MatchingMetaInfoHolder matchingMetaInfoHolder,
                                          SiddhiAppContext siddhiAppContext,
                                          List<VariableExpressionExecutor> variableExpressionExecutors,
                                          Map<String,Table> tableMap,
                                          String queryName)

To construct a finder having the capability of finding events at the processor that corresponds to the incoming matchingEvent and the given matching expression logic.

Specified by:

compileCondition in interface FindableProcessor

Parameters:

condition - the matching condition

matchingMetaInfoHolder - the meta structure of the incoming matchingEvent

siddhiAppContext - current siddhi app context

variableExpressionExecutors - the list of variable ExpressionExecutors already created

tableMap - map of event tables

queryName - query name of findable processor belongs to.

Returns:

compiled Condition having the capability of matching events against the incoming matchingEvent

getLock

public LockWrapper getLock()

currentState

public Map<String,Object> currentState()

Return an object array containing the internal state of the internalWindowProcessor.

Specified by:

currentState in interface Snapshotable

Returns:

current state of the Window

restoreState

public void restoreState(Map<String,Object> state)

Restore the internalWindowProcessor using given state.

Specified by:

restoreState in interface Snapshotable

Parameters:

state - the stateful objects of the element as an array on

getElementId

public String getElementId()

Return the elementId which may be used for snapshot creation.

Specified by:

getElementId in interface Snapshotable

Returns:

the element id of this Snapshotable object