/*
* Copyright (c) 2002-2012 Alibaba Group Holding Limited.
* All rights reserved.
*
* Licensed 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 com.alibaba.citrus.service.uribroker.support;
import static com.alibaba.citrus.util.Assert.*;
import static com.alibaba.citrus.util.CollectionUtil.*;
import java.util.Map;
import com.alibaba.citrus.service.pull.ToolFactory;
import com.alibaba.citrus.service.pull.ToolSetFactory;
import com.alibaba.citrus.service.uribroker.URIBrokerService;
import com.alibaba.citrus.service.uribroker.uri.URIBroker;
import com.alibaba.citrus.springext.support.parser.AbstractSingleBeanDefinitionParser;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
/**
* 取得所有<code>URIBroker</code>的pull tool。
*
* @author Michael Zhou
*/
public class URIBrokerTool implements ToolFactory, ToolSetFactory, InitializingBean {
private URIBrokerService brokers;
@Autowired
public void setBrokers(URIBrokerService brokers) {
this.brokers = brokers;
}
/** 初始化pull tool。 */
public void afterPropertiesSet() throws Exception {
assertNotNull(brokers, "no URIBrokerService");
}
/** 每个请求都会创建新的实例。 */
public boolean isSingleton() {
return false;
}
/** 取得所有exposed URI broker的名称。 */
public Iterable<String> getToolNames() {
return brokers.getExposedNames();
}
/** 取得一个对象，可以从中取得所有的brokers。 */
public Object createTool() throws Exception {
return new Helper();
}
/** 取得指定名称的broker。 */
public Object createTool(String name) throws Exception {
return brokers.getURIBroker(name);
}
/** 这是一个辅助类，每个请求都会创建一次。 */
public class Helper {
private Map<String, URIBroker> cache = createHashMap();
/** 便于模板使用的方法：取得指定名称的broker。 */
public URIBroker get(String name) {
URIBroker broker = cache.get(name);
if (broker == null) {
broker = brokers.getURIBroker(name);
if (broker == null) {
return null;
}
cache.put(name, broker);
}
return broker;
}
}
public static class DefinitionParser extends AbstractSingleBeanDefinitionParser<URIBrokerTool> {
}
}