public static void premain(String agentArgs, Instrumentation inst) {
String[] args = agentArgs.split(" ");
if (System.getProperty("java.version").contains("1.8"))
throw new UnsupportedOperationException(
"Java 8: https://github.com/fommil/lions-share/issues/7");
String filename = args[0];
File outFile = new File(filename);
if (outFile.delete()) out.println("[AGENT] Deleted an existing " + outFile.getAbsolutePath());
final Long period = Long.parseLong(args[1]);
checkArgument(period > 0, "period must be greater than zero seconds");
out.println("[AGENT] Writing allocation data to " + outFile.getAbsolutePath());
out.println("[AGENT] Taking snapshots every " + period + " seconds");
Map<String, Long> rates = Maps.newHashMap();
if (args.length > 2)
for (String arg : args[2].split(",")) {
String[] parts = arg.split(":");
Long sampleRate = Long.parseLong(parts[1]);
checkArgument(
!parts[0].contains(" "), parts[0] + " is not a valid type (spaces not allowed)");
checkArgument(
!parts[0].contains("."), parts[0] + " is not a valid type (replace dots with slashes)");
out.println("[AGENT] " + parts[0] + " will be sampled every " + sampleRate + " bytes");
rates.put(parts[0], sampleRate);
}
AllocationInstrumenter.premain(agentArgs, inst);
final AllocationSampler sampler = new AllocationSampler(rates, rates.keySet());
AllocationRecorder.addSampler(sampler);
final AllocationPrinter printer = new AllocationPrinter(sampler, outFile);
// HACK futile attempt to clear out stats about JVM internals...
executor.schedule(
new Runnable() {
@Override
public void run() {
sampler.clear();
executor.scheduleWithFixedDelay(printer, period, period, SECONDS);
}
},
period,
SECONDS);
Runtime.getRuntime()
.addShutdownHook(
new Thread() {
@Override
public void run() {
// tries to get logs on shutdown
printer.run();
}
});
}
protected AllocationWorker() {
AllocationRecorder.addSampler(
new Sampler() {
@Override
public void sampleAllocation(int arrayCount, String desc, Object newObj, long size) {
if (recordAllocations) {
allocationCount++;
allocationSize += size;
}
}
});
}
public static void main(String[] args) throws Exception {
AllocationRecorder.addSampler(
new Sampler() {
public void sampleAllocation(int count, String desc, Object newObj, long size) {
System.out.println(
"I just allocated the object "
+ newObj
+ " of type "
+ desc
+ " whose size is "
+ size);
if (count != -1) {
System.out.println("It's an array of size " + count);
}
}
});
new String("foo");
}
