/*
 * 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.skywalking.apm.plugin.pulsar.common;

import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.ClassEnhancePluginDefine;
import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.EnhancedInstance;
import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstanceConstructorInterceptor;

/**
 * Interceptor of pulsar topic message constructor.
 * <p>
 * The interceptor create {@link MessageEnhanceRequiredInfo} which is required by passing message span across
 * threads. Another purpose of this interceptor is to make {@link ClassEnhancePluginDefine} enable enhanced class
 * to implement {@link EnhancedInstance} interface. Because if {@link ClassEnhancePluginDefine} class will not create
 * SkyWalkingDynamicField without any constructor or method interceptor.
 */
public class TopicMessageConstructorInterceptor implements InstanceConstructorInterceptor {

    @Override
    public void onConstruct(EnhancedInstance objInst, Object[] allArguments) {
        final Object msgArgument = allArguments[2];
        if (msgArgument instanceof EnhancedInstance) {
            objInst.setSkyWalkingDynamicField(((EnhancedInstance) msgArgument).getSkyWalkingDynamicField());
        } else {
            objInst.setSkyWalkingDynamicField(new MessageEnhanceRequiredInfo());
        }

    }
}
