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/*
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* Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.jfr.internal;
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import jdk.jfr.internal.SecuritySupport.SafePath;
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import jdk.internal.misc.Unsafe;
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/**
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* Options that control Flight Recorder.
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*
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* Can be set using JFR.configure
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*
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*/
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public final class Options {
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private final static JVM jvm = JVM.getJVM();
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private final static long WAIT_INTERVAL = 1000; // ms;
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private final static long MIN_MAX_CHUNKSIZE = 1024 * 1024;
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private static final long DEFAULT_GLOBAL_BUFFER_COUNT = 20;
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private static final long DEFAULT_GLOBAL_BUFFER_SIZE = 524288;
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private static final long DEFAULT_MEMORY_SIZE = DEFAULT_GLOBAL_BUFFER_COUNT * DEFAULT_GLOBAL_BUFFER_SIZE;
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private static long DEFAULT_THREAD_BUFFER_SIZE;
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private static final int DEFAULT_STACK_DEPTH = 64;
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private static final boolean DEFAULT_SAMPLE_THREADS = true;
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private static final long DEFAULT_MAX_CHUNK_SIZE = 12 * 1024 * 1024;
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private static final SafePath DEFAULT_DUMP_PATH = SecuritySupport.USER_HOME;
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private static long memorySize;
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private static long globalBufferSize;
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private static long globalBufferCount;
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private static long threadBufferSize;
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private static int stackDepth;
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private static boolean sampleThreads;
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private static long maxChunkSize;
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private static SafePath dumpPath;
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static {
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final long pageSize = Unsafe.getUnsafe().pageSize();
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DEFAULT_THREAD_BUFFER_SIZE = pageSize > 8 * 1024 ? pageSize : 8 * 1024;
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reset();
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}
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public static synchronized void setMaxChunkSize(long max) {
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if (max < MIN_MAX_CHUNKSIZE) {
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throw new IllegalArgumentException("Max chunk size must be at least " + MIN_MAX_CHUNKSIZE);
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}
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jvm.setFileNotification(max);
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maxChunkSize = max;
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}
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public static synchronized long getMaxChunkSize() {
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return maxChunkSize;
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}
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public static synchronized void setMemorySize(long memSize) {
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jvm.setMemorySize(memSize);
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memorySize = memSize;
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}
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public static synchronized long getMemorySize() {
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return memorySize;
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}
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public static synchronized void setThreadBufferSize(long threadBufSize) {
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jvm.setThreadBufferSize(threadBufSize);
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threadBufferSize = threadBufSize;
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}
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public static synchronized long getThreadBufferSize() {
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return threadBufferSize;
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}
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public static synchronized long getGlobalBufferSize() {
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return globalBufferSize;
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}
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public static synchronized void setGlobalBufferCount(long globalBufCount) {
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jvm.setGlobalBufferCount(globalBufCount);
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globalBufferCount = globalBufCount;
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}
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public static synchronized long getGlobalBufferCount() {
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return globalBufferCount;
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}
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public static synchronized void setGlobalBufferSize(long globalBufsize) {
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jvm.setGlobalBufferSize(globalBufsize);
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globalBufferSize = globalBufsize;
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}
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public static synchronized void setDumpPath(SafePath path) {
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dumpPath = path;
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}
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public static synchronized SafePath getDumpPath() {
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return dumpPath;
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}
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public static synchronized void setStackDepth(Integer stackTraceDepth) {
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jvm.setStackDepth(stackTraceDepth);
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stackDepth = stackTraceDepth;
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}
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public static synchronized int getStackDepth() {
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return stackDepth;
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}
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public static synchronized void setSampleThreads(Boolean sample) {
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jvm.setSampleThreads(sample);
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sampleThreads = sample;
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}
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public static synchronized boolean getSampleThreads() {
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return sampleThreads;
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}
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private static synchronized void reset() {
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setMaxChunkSize(DEFAULT_MAX_CHUNK_SIZE);
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setMemorySize(DEFAULT_MEMORY_SIZE);
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setGlobalBufferSize(DEFAULT_GLOBAL_BUFFER_SIZE);
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setGlobalBufferCount(DEFAULT_GLOBAL_BUFFER_COUNT);
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setDumpPath(DEFAULT_DUMP_PATH);
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setSampleThreads(DEFAULT_SAMPLE_THREADS);
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setStackDepth(DEFAULT_STACK_DEPTH);
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setThreadBufferSize(DEFAULT_THREAD_BUFFER_SIZE);
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}
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static synchronized long getWaitInterval() {
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return WAIT_INTERVAL;
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}
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static void ensureInitialized() {
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// trigger clinit which will setup JVM defaults.
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}
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}
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