dubbo ClassLoaderCallbackFilter 源码
dubbo ClassLoaderCallbackFilter 代码
文件路径：/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/filter/ClassLoaderCallbackFilter.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.apache.dubbo.rpc.filter;
import org.apache.dubbo.common.constants.CommonConstants;
import org.apache.dubbo.common.extension.Activate;
import org.apache.dubbo.rpc.BaseFilter;
import org.apache.dubbo.rpc.Filter;
import org.apache.dubbo.rpc.Invocation;
import org.apache.dubbo.rpc.Invoker;
import org.apache.dubbo.rpc.Result;
import org.apache.dubbo.rpc.RpcException;
import static org.apache.dubbo.common.constants.CommonConstants.WORKING_CLASSLOADER_KEY;
/**
* Switch thread context class loader on filter callback.
*/
@Activate(group = CommonConstants.PROVIDER, order = Integer.MAX_VALUE)
public class ClassLoaderCallbackFilter implements Filter, BaseFilter.Listener {
@Override
public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {
return invoker.invoke(invocation);
}
@Override
public void onResponse(Result appResponse, Invoker<?> invoker, Invocation invocation) {
setClassLoader(invoker, invocation);
}
@Override
public void onError(Throwable t, Invoker<?> invoker, Invocation invocation) {
setClassLoader(invoker, invocation);
}
private void setClassLoader(Invoker<?> invoker, Invocation invocation) {
ClassLoader workingClassLoader = (ClassLoader) invocation.get(WORKING_CLASSLOADER_KEY);
if (workingClassLoader != null) {
Thread.currentThread().setContextClassLoader(workingClassLoader);
}
}
}
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