org.wso2.siddhi.core.table.record

Class AbstractQueryableRecordTable

java.lang.Object

org.wso2.siddhi.core.table.Table

org.wso2.siddhi.core.table.record.AbstractRecordTable

org.wso2.siddhi.core.table.record.AbstractQueryableRecordTable

All Implemented Interfaces:

FindableProcessor, QueryableProcessor, MemoryCalculable

public abstract class AbstractQueryableRecordTable
extends AbstractRecordTable
implements QueryableProcessor

An abstract implementation of table. Abstract implementation will handle ComplexEventChunk so that developer can directly work with event data.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	AbstractQueryableRecordTable.OrderByAttributeBuilder Holder of order by attribute with order orientation
class	AbstractQueryableRecordTable.SelectAttributeBuilder Holder of Selection attribute with renaming field

Nested classes/interfaces inherited from class org.wso2.siddhi.core.table.record.AbstractRecordTable

AbstractRecordTable.RecordStoreCompiledCondition

Field Summary

Fields inherited from class org.wso2.siddhi.core.table.record.AbstractRecordTable

recordTableHandler, storeEventPool

Fields inherited from class org.wso2.siddhi.core.table.Table

tableDefinition

Constructor Summary

Constructors

Constructor and Description
AbstractQueryableRecordTable()

Method Summary

Modifier and Type	Method and Description
protected abstract CompiledSelection	compileSelection(List<AbstractQueryableRecordTable.SelectAttributeBuilder> selectAttributeBuilders, List<ExpressionBuilder> groupByExpressionBuilder, ExpressionBuilder havingExpressionBuilder, List<AbstractQueryableRecordTable.OrderByAttributeBuilder> orderByAttributeBuilders, Long limit) Compile the query selection
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.
protected abstract RecordIterator<Object[]>	query(Map<String,Object> parameterMap, CompiledCondition compiledCondition, CompiledSelection compiledSelection) Query records matching the compiled condition and selection
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 class org.wso2.siddhi.core.table.record.AbstractRecordTable

add, add, compileCondition, compileCondition, compileSetAttribute, compileUpdateSet, contains, contains, delete, delete, find, find, getTableDefinition, init, init, update, update, updateOrAdd, updateOrAdd

Methods inherited from class org.wso2.siddhi.core.table.Table

addEvents, connect, connectWithRetry, containsEvent, deleteEvents, destroy, disconnect, find, getHandler, initTable, shutdown, updateEvents, updateOrAddEvents

Methods inherited from class java.lang.Object

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

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

compileCondition, find

Constructor Detail

AbstractQueryableRecordTable

public AbstractQueryableRecordTable()

Method Detail

query

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

Description copied from interface: QueryableProcessor

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.

Specified by:

query in interface QueryableProcessor

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

query

protected abstract RecordIterator<Object[]> query(Map<String,Object> parameterMap,
                                                  CompiledCondition compiledCondition,
                                                  CompiledSelection compiledSelection)
                                           throws ConnectionUnavailableException

Query records matching the compiled condition and selection

Parameters:

parameterMap - map of matching StreamVariable Ids and their values corresponding to the compiled condition and selection

compiledCondition - the compiledCondition against which records should be matched

compiledSelection - the compiledSelection that maps records based to requested format

Returns:

RecordIterator of matching records

Throws:

ConnectionUnavailableException

compileSelection

public 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)

Description copied from interface: QueryableProcessor

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

Specified by:

compileSelection in interface QueryableProcessor

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

compileSelection

protected abstract CompiledSelection compileSelection(List<AbstractQueryableRecordTable.SelectAttributeBuilder> selectAttributeBuilders,
                                                      List<ExpressionBuilder> groupByExpressionBuilder,
                                                      ExpressionBuilder havingExpressionBuilder,
                                                      List<AbstractQueryableRecordTable.OrderByAttributeBuilder> orderByAttributeBuilders,
                                                      Long limit)

Compile the query selection

Parameters:

selectAttributeBuilders - helps visiting the select attributes in order

groupByExpressionBuilder - helps visiting the group by attributes in order

havingExpressionBuilder - helps visiting the having condition

orderByAttributeBuilders - helps visiting the order by attributes in order

limit - defines the limit level

Returns:

compiled selection that can be used for retrieving events on a defined format