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JDK 11 jdk.jfr.jmod - JFR Module
JDK 11 jdk.jfr.jmod is the JMOD file for JDK 11 JFR module.
JDK 11 JFR module compiled class files are stored in \fyicenter\jdk-11.0.1\jmods\jdk.jfr.jmod.
JDK 11 JFR module compiled class files are also linked and stored in the \fyicenter\jdk-11.0.1\lib\modules JImage file.
JDK 11 JFR module source code files are stored in \fyicenter\jdk-11.0.1\lib\src.zip\jdk.jfr.
You can click and view the content of each source code file in the list below.
✍: FYIcenter
⏎ jdk/jfr/internal/StringPool.java
/* * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved. * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. * * * * * * * * * * * * * * * * * * * * */ package jdk.jfr.internal; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.atomic.AtomicLong; import jdk.internal.misc.Unsafe; public final class StringPool { private static final Unsafe unsafe = Unsafe.getUnsafe(); static final int MIN_LIMIT = 16; static final int MAX_LIMIT = 128; /* 0 MAX means disabled */ private static final long epochAddress; private static final SimpleStringIdPool sp = new SimpleStringIdPool(); static { epochAddress = JVM.getJVM().getEpochAddress(); sp.reset(); } public static long addString(String s) { return sp.addString(s); } private static boolean getCurrentEpoch() { return unsafe.getByte(epochAddress) == 1; } private static class SimpleStringIdPool { /* string id index */ private final AtomicLong sidIdx = new AtomicLong(); /* epoch of cached strings */ private boolean poolEpoch; /* the cache */ private final ConcurrentHashMap<String, Long> cache; /* max size */ private final int MAX_SIZE = 32*1024; /* max size bytes*/ private final long MAX_SIZE_UTF16 = 16*1024*1024; /* max size bytes*/ private long currentSizeUTF16; /* looking at a biased data set 4 is a good value */ private final String[] preCache = new String[]{"", "" , "" ,""}; /* index of oldest */ private int preCacheOld = 0; /* loop mask */ private static final int preCacheMask = 0x03; SimpleStringIdPool() { cache = new ConcurrentHashMap<>(MAX_SIZE, 0.75f); } void reset() { reset(getCurrentEpoch()); } private void reset(boolean epoch) { this.cache.clear(); this.poolEpoch = epoch; this.currentSizeUTF16 = 0; } private long addString(String s) { boolean currentEpoch = getCurrentEpoch(); if (poolEpoch == currentEpoch) { /* pool is for current chunk */ Long lsid = this.cache.get(s); if (lsid != null) { return lsid.longValue(); } } else { /* pool is for an old chunk */ reset(currentEpoch); } if (!preCache(s)) { /* we should not pool this string */ return -1; } if (cache.size() > MAX_SIZE || currentSizeUTF16 > MAX_SIZE_UTF16) { /* pool was full */ reset(currentEpoch); } return storeString(s); } private long storeString(String s) { long sid = this.sidIdx.getAndIncrement(); /* we can race but it is ok */ this.cache.put(s, sid); boolean currentEpoch; synchronized(SimpleStringIdPool.class) { currentEpoch = JVM.addStringConstant(poolEpoch, sid, s); currentSizeUTF16 += s.length(); } /* did we write in chunk that this pool represent */ return currentEpoch == poolEpoch ? sid : -1; } private boolean preCache(String s) { if (preCache[0].equals(s)) { return true; } if (preCache[1].equals(s)) { return true; } if (preCache[2].equals(s)) { return true; } if (preCache[3].equals(s)) { return true; } preCacheOld = (preCacheOld - 1) & preCacheMask; preCache[preCacheOld] = s; return false; } } }
⏎ jdk/jfr/internal/StringPool.java
Or download all of them as a single archive file:
File name: jdk.jfr-11.0.1-src.zip File size: 237632 bytes Release date: 2018-11-04 Download
⇒ JDK 11 jdk.jlink.jmod - JLink Tool
2020-06-30, 43670👍, 0💬
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