/**
* Copyright 1999-2011 Alibaba Group
*
* 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.cobar.client.router;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.Validate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.alibaba.cobar.client.router.config.DefaultCobarClientInternalRouterXmlFactoryBean;
import com.alibaba.cobar.client.router.rules.IRoutingRule;
import com.alibaba.cobar.client.router.support.IBatisRoutingFact;
import com.alibaba.cobar.client.router.support.RoutingResult;
import com.alibaba.cobar.client.support.utils.CollectionUtils;
/**
* {@link DefaultCobarClientInternalRouter} receive a map which will maintain a
* group of rules as per SQ-map namespaces.<br>
* it will evaluate the rules as per namesapce and a sequence from specific
* rules to more generic rules.<br>
* usually, the users don't need to care about these internal details, to use
* {@link DefaultCobarClientInternalRouter}, just turn to
* {@link DefaultCobarClientInternalRouterXmlFactoryBean} for instantiation.<br>
*
* @author fujohnwang
* @since 1.0
* @see DefaultCobarClientInternalRouterXmlFactoryBean
*/
public class DefaultCobarClientInternalRouter implements ICobarRouter<IBatisRoutingFact> {
private transient final Logger logger = LoggerFactory
.getLogger(DefaultCobarClientInternalRouter.class);
private Map<String, List<Set<IRoutingRule<IBatisRoutingFact, List<String>>>>> rulesGroupByNamespaces = new HashMap<String, List<Set<IRoutingRule<IBatisRoutingFact, List<String>>>>>();
public RoutingResult doRoute(IBatisRoutingFact routingFact) throws RoutingException {
Validate.notNull(routingFact);
String action = routingFact.getAction();
Validate.notEmpty(action);
String namespace = StringUtils.substringBeforeLast(action, ".");
List<Set<IRoutingRule<IBatisRoutingFact, List<String>>>> rules = getRulesGroupByNamespaces()
.get(namespace);
RoutingResult result = new RoutingResult();
result.setResourceIdentities(new ArrayList<String>());
if (!CollectionUtils.isEmpty(rules)) {
IRoutingRule<IBatisRoutingFact, List<String>> ruleToUse = null;
for (Set<IRoutingRule<IBatisRoutingFact, List<String>>> ruleSet : rules) {
ruleToUse = searchMatchedRuleAgainst(ruleSet, routingFact);
if (ruleToUse != null) {
break;
}
}
if (ruleToUse != null) {
logger.info("matched with rule:{} with fact:{}", ruleToUse, routingFact);
result.getResourceIdentities().addAll(ruleToUse.action());
} else {
logger.info("No matched rule found for routing fact:{}", routingFact);
}
}
return result;
}
private IRoutingRule<IBatisRoutingFact, List<String>> searchMatchedRuleAgainst(
Set<IRoutingRule<IBatisRoutingFact, List<String>>> rules,
IBatisRoutingFact routingFact) {
if (CollectionUtils.isEmpty(rules)) {
return null;
}
for (IRoutingRule<IBatisRoutingFact, List<String>> rule : rules) {
if (rule.isDefinedAt(routingFact)) {
return rule;
}
}
return null;
}
public void setRulesGroupByNamespaces(
Map<String, List<Set<IRoutingRule<IBatisRoutingFact, List<String>>>>> rulesGroupByNamespaces) {
this.rulesGroupByNamespaces = rulesGroupByNamespaces;
}
public Map<String, List<Set<IRoutingRule<IBatisRoutingFact, List<String>>>>> getRulesGroupByNamespaces() {
return rulesGroupByNamespaces;
}
}