/*
 * Copyright 2015 NAVER Corp.
 *
 * 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 com.navercorp.pinpoint.plugin.thrift.interceptor.server.nonblocking;

import org.apache.thrift.transport.TTransport;

import com.navercorp.pinpoint.bootstrap.logging.PLogger;
import com.navercorp.pinpoint.bootstrap.logging.PLoggerFactory;
import com.navercorp.pinpoint.plugin.thrift.field.accessor.SocketFieldAccessor;

/**
 * This interceptor retrieves the socket information from the TTransport field, and attaches it into the frame wrapping the TTransport.
 * <p>
 * Similar to {@link com.navercorp.pinpoint.plugin.thrift.interceptor.server.nonblocking.FrameBufferConstructInterceptor FrameBufferConstructInterceptor}, but
 * hooks onto the <tt>getInputTransport()</tt> method for injection.
 * <p>
 * Based on Thrift 0.8.0, 0.9.0
 * 
 * @author HyunGil Jeong
 * 
 * @see com.navercorp.pinpoint.plugin.thrift.interceptor.server.nonblocking.FrameBufferConstructInterceptor FrameBufferConstructInterceptor
 */
public class FrameBufferGetInputTransportInterceptor extends FrameBufferTransportInjectInterceptor {

    private final PLogger logger = PLoggerFactory.getLogger(this.getClass());
    private final boolean isDebug = logger.isDebugEnabled();

    @Override
    protected final boolean validate(Object target, Object[] args, Object result) {
        if (!(result instanceof TTransport)) {
            return false;
        }
        if (!(result instanceof SocketFieldAccessor)) {
            if (!isDebug) {
                logger.debug("Invalid target object. Need field accessor({}).", SocketFieldAccessor.class.getName());
            }
            return false;
        }
        return true;
    }

    @Override
    protected final TTransport getInjectionTarget(Object target, Object[] args, Object result) {
        return (TTransport)result;
    }

}