org.glowroot.agent.live.HeapHistogramTool Maven / Gradle / Ivy
/*
* Copyright 2017-2018 the original author or authors.
*
* 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 org.glowroot.agent.live;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Iterator;
import java.util.Map;
import org.glowroot.agent.shaded.com.google.common.base.Splitter;
import org.glowroot.agent.shaded.com.google.common.collect.Maps;
import org.glowroot.agent.shaded.com.google.common.collect.Ordering;
import org.glowroot.agent.shaded.com.google.common.primitives.Longs;
import org.glowroot.agent.shaded.org.checkerframework.checker.nullness.qual.Nullable;
import org.glowroot.agent.shaded.org.objectweb.asm.Type;
import org.glowroot.agent.live.JvmTool.InputStreamProcessor;
import org.glowroot.agent.util.JavaVersion;
import org.glowroot.agent.shaded.org.glowroot.wire.api.model.DownstreamServiceOuterClass.HeapHistogram;
class HeapHistogramTool {
private HeapHistogramTool() {}
static HeapHistogram run(long pid, boolean allowAttachSelf, @Nullable File glowrootJarFile)
throws Exception {
return JvmTool.run(pid, "heapHisto", new HeapHistogramProcessor(), allowAttachSelf,
glowrootJarFile);
}
private static class HeapHistogramProcessor implements InputStreamProcessor {
@Override
public HeapHistogram process(InputStream in) throws IOException {
boolean jrockit = JavaVersion.isJRockitJvm();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
// skip over header lines
String line = reader.readLine();
while (line != null && !line.contains("--------")) {
line = reader.readLine();
}
if (line == null) {
throw new IOException("Unexpected heapHisto output");
}
Map classInfos = Maps.newHashMap();
Splitter splitter = Splitter.on(' ').omitEmptyStrings();
while ((line = reader.readLine()) != null) {
if (line.startsWith("Total ") || line.endsWith(" total ---")) {
break;
}
Iterator parts = splitter.split(line).iterator();
parts.next();
long count;
long bytes;
if (jrockit) {
String bytesStr = parts.next();
bytes = 1024 * Long.parseLong(bytesStr.substring(0, bytesStr.length() - 1));
count = Long.parseLong(parts.next());
parts.next();
} else {
count = Long.parseLong(parts.next());
bytes = Long.parseLong(parts.next());
}
String className = parts.next();
// skipping PermGen objects
if (className.charAt(0) != '<') {
if (className.charAt(0) == '[') {
className = Type.getType(className).getClassName();
}
ClassInfo classInfo = classInfos.get(className);
if (classInfo == null) {
classInfo = new ClassInfo(className);
classInfos.put(className, classInfo);
}
classInfo.bytes += bytes;
classInfo.count += count;
}
}
HeapHistogram.Builder builder = HeapHistogram.newBuilder();
for (ClassInfo classInfo : ClassInfo.orderingByBytes.sortedCopy(classInfos.values())) {
builder.addClassInfo(HeapHistogram.ClassInfo.newBuilder()
.setClassName(classInfo.className)
.setBytes(classInfo.bytes)
.setCount(classInfo.count));
}
return builder.build();
}
}
private static class ClassInfo {
private static final Ordering orderingByBytes = new Ordering() {
@Override
public int compare(ClassInfo left, ClassInfo right) {
return Longs.compare(right.bytes, left.bytes);
}
};
private final String className;
private long bytes;
private long count;
private ClassInfo(String className) {
this.className = className;
}
}
}