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org.wso2.siddhi.extension.eventtable.RDBMSEventTable Maven / Gradle / Ivy
/*
* Copyright (c) 2015, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. licenses this file to you under the Apache License,
* Version 2.0 (the "License"); you may not use this file except
* in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.wso2.siddhi.extension.eventtable;
import org.apache.log4j.Logger;
import org.wso2.siddhi.core.config.ExecutionPlanContext;
import org.wso2.siddhi.core.event.ComplexEventChunk;
import org.wso2.siddhi.core.event.state.StateEvent;
import org.wso2.siddhi.core.event.stream.MetaStreamEvent;
import org.wso2.siddhi.core.event.stream.StreamEvent;
import org.wso2.siddhi.core.event.stream.StreamEventCloner;
import org.wso2.siddhi.core.event.stream.StreamEventPool;
import org.wso2.siddhi.core.exception.CannotLoadConfigurationException;
import org.wso2.siddhi.core.exception.ExecutionPlanCreationException;
import org.wso2.siddhi.core.executor.VariableExpressionExecutor;
import org.wso2.siddhi.core.table.EventTable;
import org.wso2.siddhi.core.util.SiddhiConstants;
import org.wso2.siddhi.core.util.collection.OverwritingStreamEventExtractor;
import org.wso2.siddhi.core.util.collection.UpdateAttributeMapper;
import org.wso2.siddhi.core.util.collection.operator.Finder;
import org.wso2.siddhi.core.util.collection.operator.MatchingMetaStateHolder;
import org.wso2.siddhi.core.util.collection.operator.Operator;
import org.wso2.siddhi.extension.eventtable.cache.CachingTable;
import org.wso2.siddhi.extension.eventtable.rdbms.*;
import org.wso2.siddhi.query.api.annotation.Annotation;
import org.wso2.siddhi.query.api.annotation.Element;
import org.wso2.siddhi.query.api.definition.Attribute;
import org.wso2.siddhi.query.api.definition.TableDefinition;
import org.wso2.siddhi.query.api.expression.Expression;
import org.wso2.siddhi.query.api.util.AnnotationHelper;
import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;
import java.util.Timer;
import java.util.TimerTask;
public class RDBMSEventTable implements EventTable {
private TableDefinition tableDefinition;
private DBHandler dbHandler;
private CachingTable cachedTable;
private String cacheSizeInString;
private boolean isCachingEnabled;
private static final Logger log = Logger.getLogger(RDBMSEventTable.class);
/*
Loads rdbms-table-config.xml file which provides DB mapping details
*/
static {
try {
DBQueryHelper.loadConfiguration();
} catch (CannotLoadConfigurationException e) {
throw new ExecutionPlanCreationException("Error while loading the rdbms configuration file", e);
}
}
/**
* Event Table initialization method, it checks the annotation and do necessary pre configuration tasks.
*
* @param tableDefinition Definition of event table
* @param tableMetaStreamEvent
* @param tableStreamEventPool
* @param tableStreamEventCloner
* @param executionPlanContext ExecutionPlan related meta information
*/
public void init(TableDefinition tableDefinition, MetaStreamEvent tableMetaStreamEvent, StreamEventPool tableStreamEventPool, StreamEventCloner tableStreamEventCloner, ExecutionPlanContext executionPlanContext) {
this.tableDefinition = tableDefinition;
Connection con = null;
int bloomFilterSize = RDBMSEventTableConstants.BLOOM_FILTER_SIZE;
int bloomFilterHashFunctions = RDBMSEventTableConstants.BLOOM_FILTER_HASH_FUNCTIONS;
Annotation fromAnnotation = AnnotationHelper.getAnnotation(SiddhiConstants.ANNOTATION_FROM,
tableDefinition.getAnnotations());
String dataSourceName = fromAnnotation.getElement(RDBMSEventTableConstants.ANNOTATION_ELEMENT_DATASOURCE_NAME);
String tableName = fromAnnotation.getElement(RDBMSEventTableConstants.ANNOTATION_ELEMENT_TABLE_NAME);
DataSource dataSource = executionPlanContext.getSiddhiContext().getSiddhiDataSource(dataSourceName);
List attributeList = tableDefinition.getAttributeList();
if (dataSource == null && dataSourceName == null) {
String jdbcConnectionUrl = fromAnnotation.getElement(RDBMSEventTableConstants.EVENT_TABLE_RDBMS_TABLE_JDBC_URL);
String username = fromAnnotation.getElement(RDBMSEventTableConstants.EVENT_TABLE_RDBMS_TABLE_USERNAME);
String password = fromAnnotation.getElement(RDBMSEventTableConstants.EVENT_TABLE_RDBMS_TABLE_PASSWORD);
String driverName = fromAnnotation.getElement(RDBMSEventTableConstants.EVENT_TABLE_RDBMS_TABLE_DRIVER_NAME);
List connectionPropertyElements = null;
Annotation connectionAnnotation = AnnotationHelper.getAnnotation(RDBMSEventTableConstants.ANNOTATION_CONNECTION, tableDefinition.getAnnotations());
if (connectionAnnotation != null) {
connectionPropertyElements = connectionAnnotation.getElements();
}
dataSource = PooledDataSource.getPoolDataSource(driverName, jdbcConnectionUrl, username, password, connectionPropertyElements);
}
if (dataSource == null) {
throw new ExecutionPlanCreationException("Datasource specified for the event table is invalid/null");
}
if (tableName == null) {
throw new ExecutionPlanCreationException("Invalid query specified. Required properties (tableName) not found ");
}
String cacheType = fromAnnotation.getElement(RDBMSEventTableConstants.ANNOTATION_ELEMENT_CACHE);
cacheSizeInString = fromAnnotation.getElement(RDBMSEventTableConstants.ANNOTATION_ELEMENT_CACHE_SIZE);
String cacheLoadingType = fromAnnotation.getElement(RDBMSEventTableConstants.ANNOTATION_ELEMENT_CACHE_LOADING);
String cacheValidityInterval = fromAnnotation.getElement(RDBMSEventTableConstants.ANNOTATION_ELEMENT_CACHE_VALIDITY_PERIOD);
String bloomsEnabled = fromAnnotation.getElement(RDBMSEventTableConstants.ANNOTATION_ELEMENT_BLOOM_FILTERS);
String bloomFilterValidityInterval = fromAnnotation.getElement(RDBMSEventTableConstants.ANNOTATION_ELEMENT_BLOOM_VALIDITY_PERIOD);
try {
this.dbHandler = new DBHandler(dataSource, tableName, attributeList, tableDefinition);
if ((con = dataSource.getConnection()) == null) {
throw new ExecutionPlanCreationException("Error while making connection to database");
}
if (cacheType != null) {
cachedTable = new CachingTable(cacheType, cacheSizeInString, executionPlanContext, tableDefinition);
isCachingEnabled = true;
if (cacheLoadingType != null && cacheLoadingType.equalsIgnoreCase(RDBMSEventTableConstants.EAGER_CACHE_LOADING_ELEMENT)) {
dbHandler.loadDBCache(cachedTable, cacheSizeInString);
}
if (cacheValidityInterval != null) {
Long cacheTimeInterval = Long.parseLong(cacheValidityInterval);
Timer timer = new Timer();
CacheUpdateTask cacheUpdateTask = new CacheUpdateTask();
timer.schedule(cacheUpdateTask, cacheTimeInterval);
}
} else if (bloomsEnabled != null && bloomsEnabled.equalsIgnoreCase("enable")) {
String bloomsFilterSize = fromAnnotation.getElement(RDBMSEventTableConstants.ANNOTATION_ELEMENT_BLOOM_FILTERS_SIZE);
String bloomsFilterHash = fromAnnotation.getElement(RDBMSEventTableConstants.ANNOTATION_ELEMENT_BLOOM_FILTERS_HASH);
if (bloomsFilterSize != null) {
bloomFilterSize = Integer.parseInt(bloomsFilterSize);
}
if (bloomsFilterHash != null) {
bloomFilterHashFunctions = Integer.parseInt(bloomsFilterHash);
}
dbHandler.setBloomFilters(bloomFilterSize, bloomFilterHashFunctions);
dbHandler.buildBloomFilters();
if (bloomFilterValidityInterval != null) {
Long bloomTimeInterval = Long.parseLong(bloomFilterValidityInterval);
Timer timer = new Timer();
BloomsUpdateTask bloomsUpdateTask = new BloomsUpdateTask();
timer.schedule(bloomsUpdateTask, bloomTimeInterval, bloomTimeInterval);
}
}
} catch (SQLException e) {
throw new ExecutionPlanCreationException("Error while making connection to database", e);
} finally {
if (con != null) {
try {
con.close();
} catch (SQLException e) {
log.error("unable to release connection", e);
}
}
}
}
@Override
public TableDefinition getTableDefinition() {
return tableDefinition;
}
/**
* Called when adding an event to the event table
*
* @param addingEventChunk input event list
*/
@Override
public void add(ComplexEventChunk addingEventChunk) {
dbHandler.addEvent(addingEventChunk);
}
@Override
public void update(ComplexEventChunk updatingEventChunk, Operator operator, UpdateAttributeMapper[] updateAttributeMappers) {
operator.update(updatingEventChunk, null, null);
if (isCachingEnabled) {
((RDBMSOperator) operator).getInMemoryEventTableOperator().update(updatingEventChunk, cachedTable.getCacheList(), updateAttributeMappers);
}
}
@Override
public void overwriteOrAdd(ComplexEventChunk overwritingOrAddingEventChunk, Operator operator, UpdateAttributeMapper[] updateAttributeMappers, OverwritingStreamEventExtractor overwritingStreamEventExtractor) {
operator.overwriteOrAdd(overwritingOrAddingEventChunk, null, null, overwritingStreamEventExtractor);
if (isCachingEnabled) {
((RDBMSOperator) operator).getInMemoryEventTableOperator().overwriteOrAdd(overwritingOrAddingEventChunk, cachedTable.getCacheList(), updateAttributeMappers, overwritingStreamEventExtractor);
}
}
/**
* Called when having "in" condition, to check the existence of the event
*
* @param matchingEvent Event that need to be check for existence
* @param finder Operator that perform RDBMS related search
*/
@Override
public synchronized boolean contains(StateEvent matchingEvent, Finder finder) {
if (isCachingEnabled) {
return ((RDBMSOperator) finder).getInMemoryEventTableOperator().contains(matchingEvent, cachedTable.getCacheList()) || finder.contains(matchingEvent, null);
} else {
return finder.contains(matchingEvent, null);
}
}
/**
* Called when deleting an event chunk from event table
*
* @param deletingEventChunk Event list for deletion
* @param operator Operator that perform RDBMS related operations
*/
@Override
public synchronized void delete(ComplexEventChunk deletingEventChunk, Operator operator) {
operator.delete(deletingEventChunk, null);
if (isCachingEnabled) {
((RDBMSOperator) operator).getInMemoryEventTableOperator().delete(deletingEventChunk, cachedTable.getCacheList());
}
}
/**
* Called to construct a operator to perform delete and update operations
*/
@Override
public Operator constructOperator(Expression expression, MatchingMetaStateHolder matchingMetaStateHolder, ExecutionPlanContext executionPlanContext, List variableExpressionExecutors, Map eventTableMap) {
return RDBMSOperatorParser.parse(dbHandler, expression, matchingMetaStateHolder, executionPlanContext, variableExpressionExecutors, eventTableMap, tableDefinition, cachedTable, tableDefinition.getId());
}
/**
* Called to find a event from event table
*/
@Override
public synchronized StreamEvent find(StateEvent matchingEvent, Finder finder) {
return finder.find(matchingEvent, null, null);
}
/**
* Called to construct a operator to perform search operations
*/
@Override
public Finder constructFinder(Expression expression, MatchingMetaStateHolder matchingMetaStateHolder, ExecutionPlanContext executionPlanContext, List variableExpressionExecutors, Map eventTableMap) {
return RDBMSOperatorParser.parse(dbHandler, expression, matchingMetaStateHolder, executionPlanContext, variableExpressionExecutors, eventTableMap, tableDefinition, cachedTable, tableDefinition.getId());
}
class CacheUpdateTask extends TimerTask {
public void run() {
cachedTable.invalidateCache();
dbHandler.loadDBCache(cachedTable, cacheSizeInString);
}
}
class BloomsUpdateTask extends TimerTask {
public void run() {
dbHandler.buildBloomFilters();
}
}
}
