/*
 * 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.tomcat78x;

import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import org.apache.skywalking.apm.agent.core.context.ContextManager;
import org.apache.skywalking.apm.agent.core.context.trace.AbstractSpan;
import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.EnhancedInstance;
import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstanceConstructorInterceptor;
import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstanceMethodsAroundInterceptor;
import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.MethodInterceptResult;

public class ForwardInterceptor implements InstanceMethodsAroundInterceptor, InstanceConstructorInterceptor {

    @Override
    public void beforeMethod(EnhancedInstance objInst, Method method, Object[] allArguments, Class<?>[] argumentsTypes,
        MethodInterceptResult result) throws Throwable {
        if (ContextManager.isActive()) {
            AbstractSpan abstractTracingSpan = ContextManager.activeSpan();
            Map<String, String> eventMap = new HashMap<String, String>();
            eventMap.put("forward-url", (String)objInst.getSkyWalkingDynamicField());
            abstractTracingSpan.log(System.currentTimeMillis(), eventMap);
            ContextManager.getRuntimeContext().put(Constants.FORWARD_REQUEST_FLAG, true);
        }
    }

    @Override
    public Object afterMethod(EnhancedInstance objInst, Method method, Object[] allArguments, Class<?>[] argumentsTypes,
        Object ret) throws Throwable {

        return ret;
    }

    @Override public void handleMethodException(EnhancedInstance objInst, Method method, Object[] allArguments,
        Class<?>[] argumentsTypes, Throwable t) {

    }

    @Override
    public void onConstruct(EnhancedInstance objInst, Object[] allArguments) {
        objInst.setSkyWalkingDynamicField(allArguments[1]);
    }
}

@@ -2004,16 +2004,74 @@
 l%22, 
-(String)
+objInst.getSkyWalkingDynamicField() == null ? %22%22 : String.valueOf(
 objI
@@ -2102,16 +2102,17 @@
 Field())
+)
 ;%0A      

FIX NPE in tomcat plugin ForwardInterceptor (#1562)