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DefaultRemotingParser.java
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DefaultRemotingParser.java
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/*
* Copyright 1999-2019 Seata.io 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 io.seata.rm.tcc.remoting.parser;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import io.seata.common.exception.FrameworkException;
import io.seata.common.loader.EnhancedServiceLoader;
import io.seata.common.util.CollectionUtils;
import io.seata.rm.DefaultResourceManager;
import io.seata.rm.tcc.TCCResource;
import io.seata.rm.tcc.api.BusinessActionContext;
import io.seata.rm.tcc.api.BusinessActionContextParameter;
import io.seata.rm.tcc.api.TwoPhaseBusinessAction;
import io.seata.rm.tcc.interceptor.ActionContextUtil;
import io.seata.rm.tcc.remoting.RemotingDesc;
import io.seata.rm.tcc.remoting.RemotingParser;
/**
* parsing remoting bean
*
* @author zhangsen
* @author Yujianfei
*/
public class DefaultRemotingParser {
/**
* all remoting bean parser
*/
protected static List<RemotingParser> allRemotingParsers = new ArrayList<>();
/**
* all remoting beans beanName -> RemotingDesc
*/
protected static Map<String, RemotingDesc> remotingServiceMap = new ConcurrentHashMap<>();
private static class SingletonHolder {
private static final DefaultRemotingParser INSTANCE = new DefaultRemotingParser();
}
/**
* Get resource manager.
*
* @return the resource manager
*/
public static DefaultRemotingParser get() {
return DefaultRemotingParser.SingletonHolder.INSTANCE;
}
/**
* Instantiates a new Default remoting parser.
*/
protected DefaultRemotingParser() {
initRemotingParser();
}
/**
* init parsers
*/
protected void initRemotingParser() {
//init all resource managers
List<RemotingParser> remotingParsers = EnhancedServiceLoader.loadAll(RemotingParser.class);
if (CollectionUtils.isNotEmpty(remotingParsers)) {
allRemotingParsers.addAll(remotingParsers);
}
}
/**
* is remoting bean ?
*
* @param bean the bean
* @param beanName the bean name
* @return boolean boolean
*/
public RemotingParser isRemoting(Object bean, String beanName) {
for (RemotingParser remotingParser : allRemotingParsers) {
if (remotingParser.isRemoting(bean, beanName)) {
return remotingParser;
}
}
return null;
}
/**
* is reference bean?
*
* @param bean the bean
* @param beanName the bean name
* @return boolean boolean
*/
public boolean isReference(Object bean, String beanName) {
for (RemotingParser remotingParser : allRemotingParsers) {
if (remotingParser.isReference(bean, beanName)) {
return true;
}
}
return false;
}
/**
* is service bean ?
*
* @param bean the bean
* @param beanName the bean name
* @return boolean boolean
*/
public boolean isService(Object bean, String beanName) {
for (RemotingParser remotingParser : allRemotingParsers) {
if (remotingParser.isService(bean, beanName)) {
return true;
}
}
return false;
}
/**
* get the remoting Service desc
*
* @param bean the bean
* @param beanName the bean name
* @return service desc
*/
public RemotingDesc getServiceDesc(Object bean, String beanName) {
List<RemotingDesc> ret = new ArrayList<>();
for (RemotingParser remotingParser : allRemotingParsers) {
RemotingDesc s = remotingParser.getServiceDesc(bean, beanName);
if (s != null) {
ret.add(s);
}
}
if (ret.size() == 1) {
return ret.get(0);
} else if (ret.size() > 1) {
throw new FrameworkException(String.format("More than one RemotingParser for bean: %s", beanName));
} else {
return null;
}
}
/**
* parse the remoting bean info
*
* @param bean the bean
* @param beanName the bean name
* @param remotingParser the remoting parser
* @return remoting desc
*/
public RemotingDesc parserRemotingServiceInfo(Object bean, String beanName, RemotingParser remotingParser) {
RemotingDesc remotingBeanDesc = remotingParser.getServiceDesc(bean, beanName);
if (remotingBeanDesc == null) {
return null;
}
remotingServiceMap.put(beanName, remotingBeanDesc);
Class<?> serviceClass = remotingBeanDesc.getServiceClass();
Method[] methods = serviceClass.getMethods();
if (remotingParser.isService(bean, beanName)) {
try {
//service bean, registry resource
Object targetBean = remotingBeanDesc.getTargetBean();
for (Method m : methods) {
TwoPhaseBusinessAction twoPhaseBusinessAction = m.getAnnotation(TwoPhaseBusinessAction.class);
if (twoPhaseBusinessAction != null) {
TCCResource tccResource = new TCCResource();
tccResource.setActionName(twoPhaseBusinessAction.name());
tccResource.setTargetBean(targetBean);
tccResource.setPrepareMethod(m);
tccResource.setCommitMethodName(twoPhaseBusinessAction.commitMethod());
tccResource.setCommitMethod(serviceClass.getMethod(twoPhaseBusinessAction.commitMethod(),
twoPhaseBusinessAction.commitArgsClasses()));
tccResource.setRollbackMethodName(twoPhaseBusinessAction.rollbackMethod());
tccResource.setRollbackMethod(serviceClass.getMethod(twoPhaseBusinessAction.rollbackMethod(),
twoPhaseBusinessAction.rollbackArgsClasses()));
// set argsClasses
tccResource.setCommitArgsClasses(twoPhaseBusinessAction.commitArgsClasses());
tccResource.setRollbackArgsClasses(twoPhaseBusinessAction.rollbackArgsClasses());
// set phase two method's keys
tccResource.setPhaseTwoCommitKeys(this.getTwoPhaseArgs(tccResource.getCommitMethod(),
twoPhaseBusinessAction.commitArgsClasses()));
tccResource.setPhaseTwoRollbackKeys(this.getTwoPhaseArgs(tccResource.getRollbackMethod(),
twoPhaseBusinessAction.rollbackArgsClasses()));
//registry tcc resource
DefaultResourceManager.get().registerResource(tccResource);
}
}
} catch (Throwable t) {
throw new FrameworkException(t, "parser remoting service error");
}
}
if (remotingParser.isReference(bean, beanName)) {
//reference bean, TCC proxy
remotingBeanDesc.setReference(true);
}
return remotingBeanDesc;
}
protected String[] getTwoPhaseArgs(Method method, Class<?>[] argsClasses) {
Annotation[][] parameterAnnotations = method.getParameterAnnotations();
String[] keys = new String[parameterAnnotations.length];
/*
* get parameter's key
* if method's parameter list is like
* (BusinessActionContext, @BusinessActionContextParameter("a") A a, @BusinessActionContextParameter("b") B b)
* the keys will be [null, a, b]
*/
for (int i = 0; i < parameterAnnotations.length; i++) {
for (int j = 0; j < parameterAnnotations[i].length; j++) {
if (parameterAnnotations[i][j] instanceof BusinessActionContextParameter) {
BusinessActionContextParameter param = (BusinessActionContextParameter)parameterAnnotations[i][j];
String key = ActionContextUtil.getParamNameFromAnnotation(param);
keys[i] = key;
break;
}
}
if (keys[i] == null && !(argsClasses[i].equals(BusinessActionContext.class))) {
throw new IllegalArgumentException("non-BusinessActionContext parameter should use annotation " +
"BusinessActionContextParameter");
}
}
return keys;
}
/**
* Get remoting bean desc remoting desc.
*
* @param beanName the bean name
* @return the remoting desc
*/
public RemotingDesc getRemotingBeanDesc(String beanName) {
return remotingServiceMap.get(beanName);
}
}