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Cattle framework cloud discovery common component pom

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/*
 * Copyright (C) 2018 the original author or authors.
 *
 * 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 org.cattleframework.cloud.discovery.reflect;

import java.lang.reflect.Method;
import java.util.List;

import org.apache.commons.collections4.CollectionUtils;
import org.cattleframework.cloud.discovery.event.DiscoveryClientEvent;
import org.cattleframework.utils.reflect.ReflectUtils;
import org.checkerframework.checker.nullness.qual.Nullable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;

import com.google.common.reflect.AbstractInvocationHandler;

/**
 * 服务发现客户端调用处理类
 * 
 * @author orange
 *
 */
public class DiscoveryClientInvocationHandler extends AbstractInvocationHandler {

    private static final Logger logger = LoggerFactory.getLogger(DiscoveryClientInvocationHandler.class);

    private static final String METHOD_NAME_GET_INSTANCES = "getInstances";

    private final DiscoveryClient target;

    private final List discoveryClientEvents;

    public DiscoveryClientInvocationHandler(DiscoveryClient target, List discoveryClientEvents) {
	this.target = target;
	this.discoveryClientEvents = discoveryClientEvents;
    }

    @SuppressWarnings("unchecked")
    @Override
    protected Object handleInvocation(Object proxy, Method method, @Nullable Object[] args) throws Throwable {
	Object result = ReflectUtils.invokeObjectMethod(method, target, args);
	String methodName = method.getName();
	if (METHOD_NAME_GET_INSTANCES.equals(methodName) && CollectionUtils.isNotEmpty(discoveryClientEvents)) {
	    String serviceId = (String) args[0];
	    List serviceInstances = (List) result;
	    discoveryClientEvents.forEach(discoveryClientEvent -> {
		logger.debug("执行服务发现客户端事件类:{}", discoveryClientEvent.getClass().getName());
		discoveryClientEvent.onGetInstances(serviceId, serviceInstances);
	    });
	    return serviceInstances;
	}
	return result;
    }
}