/*
* 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.profiler;
import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.Instrumentation;
import java.lang.instrument.UnmodifiableClassException;
import com.navercorp.pinpoint.bootstrap.instrument.RequestHandle;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.navercorp.pinpoint.bootstrap.instrument.DynamicTransformRequestListener;
import com.navercorp.pinpoint.bootstrap.instrument.DynamicTransformTrigger;
import com.navercorp.pinpoint.common.util.Asserts;
/**
* @author emeroad
*/
public class DynamicTransformService implements DynamicTransformTrigger {
private final Logger logger = LoggerFactory.getLogger(this.getClass());
private final Instrumentation instrumentation;
private DynamicTransformRequestListener dynamicTransformRequestListener;
public DynamicTransformService(Instrumentation instrumentation, DynamicTransformRequestListener listener) {
Asserts.notNull(instrumentation, "instrumentation");
Asserts.notNull(listener, "listener");
this.instrumentation = instrumentation;
this.dynamicTransformRequestListener = listener;
}
@Override
public void retransform(Class<?> target, ClassFileTransformer transformer) {
if (this.logger.isDebugEnabled()) {
logger.debug("retransform request class:{}", target.getName());
}
assertClass(target);
final RequestHandle requestHandle = this.dynamicTransformRequestListener.onRetransformRequest(target, transformer);
boolean success = false;
try {
triggerRetransform(target);
success = true;
} finally {
if (!success) {
requestHandle.cancel();
}
}
}
@Override
public void addClassFileTransformer(ClassLoader classLoader, String targetClassName, ClassFileTransformer transformer) {
if (this.logger.isDebugEnabled()) {
logger.debug("Add dynamic transform. classLoader={}, class={}", classLoader, targetClassName);
}
this.dynamicTransformRequestListener.onTransformRequest(classLoader, targetClassName, transformer);
}
private void assertClass(Class<?> target) {
if (!instrumentation.isModifiableClass(target)) {
throw new ProfilerException("Target class " + target + " is not modifiable");
}
}
private void triggerRetransform(Class<?> target) {
try {
instrumentation.retransformClasses(target);
} catch (UnmodifiableClassException e) {
throw new ProfilerException(e);
}
}
public void setTransformRequestEventListener(DynamicTransformRequestListener retransformEventListener) {
if (retransformEventListener == null) {
throw new NullPointerException("dynamicTransformRequestListener must not be null");
}
this.dynamicTransformRequestListener = retransformEventListener;
}
}