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MetricEnhancer.java
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package act.metric;
/*-
* #%L
* ACT Framework
* %%
* Copyright (C) 2014 - 2018 ActFramework
* %%
* 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.
* #L%
*/
import act.app.App;
import act.asm.*;
import act.asm.commons.AdviceAdapter;
import act.util.AppByteCodeEnhancer;
import org.osgl.$;
import org.osgl.util.S;
public class MetricEnhancer extends AppByteCodeEnhancer<MetricEnhancer> {
private static final String DESC_MEASURE_TIME = Type.getType(MeasureTime.class).getDescriptor();
private static final String DESC_MEASURE_COUNT = Type.getType(MeasureCount.class).getDescriptor();
private static final Type TYPE_METRIC = Type.getType(Metric.class);
private static final Type TYPE_TIMER = Type.getType(Timer.class);
private String className;
private MetricMetaInfoRepo repo;
public MetricEnhancer() {
}
// for unit testing
MetricEnhancer(MetricMetaInfoRepo repo, ClassVisitor cv) {
super(S.F.startsWith("act.").negate(), cv);
this.repo = $.requireNotNull(repo);
}
public MetricEnhancer(ClassVisitor cv) {
super(S.F.startsWith("act.").negate(), cv);
}
@Override
public AppByteCodeEnhancer app(App app) {
repo = app.metricMetaInfoRepo();
return super.app(app);
}
@Override
protected Class<MetricEnhancer> subClass() {
return MetricEnhancer.class;
}
@Override
public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
className = Type.getObjectType(name).getClassName();
super.visit(version, access, name, signature, superName, interfaces);
}
@Override
public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
MethodVisitor mv = super.visitMethod(access, name, desc, signature, exceptions);
final String methodName = name;
return new AdviceAdapter(ASM5, mv, access, name, desc) {
private String timeLabel;
private String countLabel;
private int posMetric;
private int posTimer;
private Label startFinally = new Label();
@Override
public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
AnnotationVisitor av = super.visitAnnotation(desc, visible);
if (DESC_MEASURE_TIME.equals(desc)) {
timeLabel = methodName;
return new AnnotationVisitor(ASM5, av) {
@Override
public void visit(String name, Object value) {
super.visit(name, value);
if ("value".equals(name)) {
timeLabel = S.string(value);
}
}
};
} else if (DESC_MEASURE_COUNT.equals(desc)) {
countLabel = methodName;
return new AnnotationVisitor(ASM5, av) {
@Override
public void visit(String name, Object value) {
super.visit(name, value);
if ("value".equals(name)) {
countLabel = S.string(value);
}
}
};
}
return av;
}
@Override
public void visitCode() {
super.visitCode();
if (null != timeLabel) {
mv.visitLabel(startFinally);
}
}
@Override
public void visitMaxs(int maxStack, int maxLocals) {
if (null != timeLabel) {
Label endFinally = new Label();
mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
mv.visitLabel(endFinally);
onFinally(ATHROW);
mv.visitInsn(ATHROW);
mv.visitMaxs(maxStack, maxLocals);
} else {
super.visitMaxs(maxStack, maxLocals);
}
}
@Override
protected void onMethodEnter() {
if (null == timeLabel && null == countLabel) {
return;
}
posMetric = newLocal(TYPE_METRIC);
mv.visitMethodInsn(INVOKESTATIC, "act/Act", "metricPlugin", "()Lact/metric/MetricPlugin;", false);
String context = repo.contextOfClass(className);
mv.visitLdcInsn("app");
mv.visitMethodInsn(INVOKEINTERFACE, "act/metric/MetricPlugin", "metric", "(Ljava/lang/String;)Lact/metric/Metric;", true);
mv.visitVarInsn(ASTORE, posMetric);
if (null != countLabel && !countLabel.equalsIgnoreCase(timeLabel)) {
mv.visitVarInsn(ALOAD, posMetric);
mv.visitLdcInsn(MetricMetaInfoRepo.concat(context, countLabel));
mv.visitMethodInsn(INVOKEINTERFACE, "act/metric/Metric", "countOnce", "(Ljava/lang/String;)V", true);
}
if (null != timeLabel) {
posTimer = newLocal(TYPE_TIMER);
mv.visitVarInsn(ALOAD, posMetric);
mv.visitLdcInsn(MetricMetaInfoRepo.concat(context, timeLabel));
mv.visitMethodInsn(INVOKEINTERFACE, "act/metric/Metric", "startTimer", "(Ljava/lang/String;)Lact/metric/Timer;", true);
mv.visitVarInsn(ASTORE, posTimer);
}
}
protected final void onMethodExit(int opcode) {
if (null == timeLabel) {
return;
}
if (opcode != ATHROW) {
onFinally(opcode);
}
}
private void onFinally(int opcode) {
mv.visitVarInsn(ALOAD, posTimer);
mv.visitMethodInsn(INVOKEINTERFACE, "act/metric/Timer", "close", "()V", true);
}
};
}
}