GsonPlugin.java example

Explorer
pinpoint-master
/*
 * Copyright 2014 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.gson;

import com.navercorp.pinpoint.bootstrap.instrument.InstrumentClass;
import com.navercorp.pinpoint.bootstrap.instrument.InstrumentException;
import com.navercorp.pinpoint.bootstrap.instrument.InstrumentMethod;
import com.navercorp.pinpoint.bootstrap.instrument.Instrumentor;
import com.navercorp.pinpoint.bootstrap.instrument.MethodFilters;
import com.navercorp.pinpoint.bootstrap.instrument.transformer.TransformCallback;
import com.navercorp.pinpoint.bootstrap.instrument.transformer.TransformTemplate;
import com.navercorp.pinpoint.bootstrap.instrument.transformer.TransformTemplateAware;
import com.navercorp.pinpoint.bootstrap.logging.PLogger;
import com.navercorp.pinpoint.bootstrap.logging.PLoggerFactory;
import com.navercorp.pinpoint.bootstrap.plugin.ProfilerPlugin;
import com.navercorp.pinpoint.bootstrap.plugin.ProfilerPluginSetupContext;
import com.navercorp.pinpoint.common.trace.AnnotationKey;
import com.navercorp.pinpoint.common.trace.AnnotationKeyFactory;
import com.navercorp.pinpoint.common.trace.ServiceType;
import com.navercorp.pinpoint.common.trace.ServiceTypeFactory;

import java.security.ProtectionDomain;

/**
 * @author ChaYoung You
 */
public class GsonPlugin implements ProfilerPlugin, TransformTemplateAware {
    public static final ServiceType GSON_SERVICE_TYPE = ServiceTypeFactory.of(5010, "GSON");
    public static final AnnotationKey GSON_ANNOTATION_KEY_JSON_LENGTH = AnnotationKeyFactory.of(9000, "gson.json.length");

    private static final String GSON_SCOPE = "GSON_SCOPE";

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

    private TransformTemplate transformTemplate;

    @Override
    public void setup(ProfilerPluginSetupContext context) {
        GsonConfig config = new GsonConfig(context.getConfig());
        logger.debug("[Gson] Initialized config={}", config);

        if (config.isProfile()) {
            transformTemplate.transform("com.google.gson.Gson", new TransformCallback() {

                @Override
                public byte[] doInTransform(Instrumentor instrumentor, ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) throws InstrumentException {
                    InstrumentClass target = instrumentor.getInstrumentClass(loader, className, classfileBuffer);

                    for (InstrumentMethod m : target.getDeclaredMethods(MethodFilters.name("fromJson"))) {
                        m.addScopedInterceptor("com.navercorp.pinpoint.plugin.gson.interceptor.FromJsonInterceptor", GSON_SCOPE);
                    }

                    for (InstrumentMethod m : target.getDeclaredMethods(MethodFilters.name("toJson"))) {
                        m.addScopedInterceptor("com.navercorp.pinpoint.plugin.gson.interceptor.ToJsonInterceptor", GSON_SCOPE);
                    }

                    return target.toBytecode();
                }
            });
        }
    }


    @Override
    public void setTransformTemplate(TransformTemplate transformTemplate) {
        this.transformTemplate = transformTemplate;
    }
}