org.wso2.siddhi.core.query.processor.stream.window

Interface QueryableProcessor

All Superinterfaces:

FindableProcessor

All Known Implementing Classes:

AbstractQueryableRecordTable

public interface QueryableProcessor
extends FindableProcessor

Interface for all processors which holds a collection of events and supports traversing and finding events from that collection with different selection criteria. query() will be used by StoreQuery to get matching event in defined format.

Method Summary

Modifier and Type	Method and Description
CompiledSelection	compileSelection(org.wso2.siddhi.query.api.execution.query.selection.Selector selector, MatchingMetaInfoHolder matchingMetaInfoHolder, SiddhiAppContext siddhiAppContext, List<VariableExpressionExecutor> variableExpressionExecutors, Map<String,Table> tableMap, String queryName) To construct a selection having the capability of transforming events based on given selection logic.
StreamEvent	query(StateEvent matchingEvent, CompiledCondition compiledCondition, CompiledSelection compiledSelection) To find events from the processor event pool, that the matches the matchingEvent based on finder logic and return them based on the defined selection.

Methods inherited from interface org.wso2.siddhi.core.query.processor.stream.window.FindableProcessor

compileCondition, find

Method Detail

query

StreamEvent query(StateEvent matchingEvent,
                  CompiledCondition compiledCondition,
                  CompiledSelection compiledSelection)
           throws ConnectionUnavailableException

To find events from the processor event pool, that the matches the matchingEvent based on finder logic and return them based on the defined selection.

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

compiledSelection - the execution element responsible for transforming the corresponding events to the given selection

Returns:

the matched events

Throws:

ConnectionUnavailableException

compileSelection

CompiledSelection compileSelection(org.wso2.siddhi.query.api.execution.query.selection.Selector selector,
                                   MatchingMetaInfoHolder matchingMetaInfoHolder,
                                   SiddhiAppContext siddhiAppContext,
                                   List<VariableExpressionExecutor> variableExpressionExecutors,
                                   Map<String,Table> tableMap,
                                   String queryName)

To construct a selection having the capability of transforming events based on given selection logic.

Parameters:

selector - the query selector

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 Selection having the capability of transforming events based on the selection