/*
* Copyright (c) 2016, 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.core.util.extension.holder;
import org.wso2.siddhi.core.config.ExecutionPlanContext;
import org.wso2.siddhi.core.query.processor.stream.window.WindowProcessor;
import java.util.concurrent.ConcurrentHashMap;
/**
* Holder to store {@link WindowProcessor} Extensions.
*/
public class WindowProcessorExtensionHolder extends AbstractExtensionHolder {
private static Class clazz = WindowProcessor.class;
private WindowProcessorExtensionHolder(ExecutionPlanContext executionPlanContext) {
super(clazz, executionPlanContext);
}
public static WindowProcessorExtensionHolder getInstance(ExecutionPlanContext executionPlanContext) {
ConcurrentHashMap<Class, AbstractExtensionHolder> extensionHolderMap = executionPlanContext.getSiddhiContext
().getExtensionHolderMap();
AbstractExtensionHolder abstractExtensionHolder = extensionHolderMap.get(clazz);
if (abstractExtensionHolder == null) {
abstractExtensionHolder = new WindowProcessorExtensionHolder(executionPlanContext);
extensionHolderMap.putIfAbsent(clazz, abstractExtensionHolder);
}
return (WindowProcessorExtensionHolder) extensionHolderMap.get(clazz);
}
}