/*
 * 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.cluster.filter.support;

import org.apache.dubbo.common.extension.Activate;
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 org.apache.dubbo.rpc.cluster.filter.ClusterFilter;
import org.apache.dubbo.rpc.model.ServiceModel;

import java.util.Optional;

import static org.apache.dubbo.common.constants.CommonConstants.CONSUMER;

@Activate(group = CONSUMER, order = Integer.MIN_VALUE + 100)
public class ConsumerClassLoaderFilter implements ClusterFilter {
    @Override
    public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {
        ClassLoader originClassLoader = Thread.currentThread().getContextClassLoader();
        try {
            Optional.ofNullable(invocation.getServiceModel())
                    .map(ServiceModel::getClassLoader)
                    .ifPresent(Thread.currentThread()::setContextClassLoader);
            return invoker.invoke(invocation);
        } finally {
            Thread.currentThread().setContextClassLoader(originClassLoader);
        }
    }
}
