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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package jdk.jfr.internal;

import jdk.jfr.internal.SecuritySupport.SafePath;
import jdk.internal.misc.Unsafe;

Options that control Flight Recorder. Can be set using JFR.configure
/** * Options that control Flight Recorder. * * Can be set using JFR.configure * */
public final class Options { private final static JVM jvm = JVM.getJVM(); private final static long WAIT_INTERVAL = 1000; // ms; private final static long MIN_MAX_CHUNKSIZE = 1024 * 1024; private static final long DEFAULT_GLOBAL_BUFFER_COUNT = 20; private static final long DEFAULT_GLOBAL_BUFFER_SIZE = 524288; private static final long DEFAULT_MEMORY_SIZE = DEFAULT_GLOBAL_BUFFER_COUNT * DEFAULT_GLOBAL_BUFFER_SIZE; private static long DEFAULT_THREAD_BUFFER_SIZE; private static final int DEFAULT_STACK_DEPTH = 64; private static final boolean DEFAULT_SAMPLE_THREADS = true; private static final long DEFAULT_MAX_CHUNK_SIZE = 12 * 1024 * 1024; private static final SafePath DEFAULT_DUMP_PATH = SecuritySupport.USER_HOME; private static long memorySize; private static long globalBufferSize; private static long globalBufferCount; private static long threadBufferSize; private static int stackDepth; private static boolean sampleThreads; private static long maxChunkSize; private static SafePath dumpPath; static { final long pageSize = Unsafe.getUnsafe().pageSize(); DEFAULT_THREAD_BUFFER_SIZE = pageSize > 8 * 1024 ? pageSize : 8 * 1024; reset(); } public static synchronized void setMaxChunkSize(long max) { if (max < MIN_MAX_CHUNKSIZE) { throw new IllegalArgumentException("Max chunk size must be at least " + MIN_MAX_CHUNKSIZE); } jvm.setFileNotification(max); maxChunkSize = max; } public static synchronized long getMaxChunkSize() { return maxChunkSize; } public static synchronized void setMemorySize(long memSize) { jvm.setMemorySize(memSize); memorySize = memSize; } public static synchronized long getMemorySize() { return memorySize; } public static synchronized void setThreadBufferSize(long threadBufSize) { jvm.setThreadBufferSize(threadBufSize); threadBufferSize = threadBufSize; } public static synchronized long getThreadBufferSize() { return threadBufferSize; } public static synchronized long getGlobalBufferSize() { return globalBufferSize; } public static synchronized void setGlobalBufferCount(long globalBufCount) { jvm.setGlobalBufferCount(globalBufCount); globalBufferCount = globalBufCount; } public static synchronized long getGlobalBufferCount() { return globalBufferCount; } public static synchronized void setGlobalBufferSize(long globalBufsize) { jvm.setGlobalBufferSize(globalBufsize); globalBufferSize = globalBufsize; } public static synchronized void setDumpPath(SafePath path) { dumpPath = path; } public static synchronized SafePath getDumpPath() { return dumpPath; } public static synchronized void setStackDepth(Integer stackTraceDepth) { jvm.setStackDepth(stackTraceDepth); stackDepth = stackTraceDepth; } public static synchronized int getStackDepth() { return stackDepth; } public static synchronized void setSampleThreads(Boolean sample) { jvm.setSampleThreads(sample); sampleThreads = sample; } public static synchronized boolean getSampleThreads() { return sampleThreads; } private static synchronized void reset() { setMaxChunkSize(DEFAULT_MAX_CHUNK_SIZE); setMemorySize(DEFAULT_MEMORY_SIZE); setGlobalBufferSize(DEFAULT_GLOBAL_BUFFER_SIZE); setGlobalBufferCount(DEFAULT_GLOBAL_BUFFER_COUNT); setDumpPath(DEFAULT_DUMP_PATH); setSampleThreads(DEFAULT_SAMPLE_THREADS); setStackDepth(DEFAULT_STACK_DEPTH); setThreadBufferSize(DEFAULT_THREAD_BUFFER_SIZE); } static synchronized long getWaitInterval() { return WAIT_INTERVAL; } static void ensureInitialized() { // trigger clinit which will setup JVM defaults. } }