Mercurial > hg > openjdk > jdk8u > jdk
view src/share/classes/jdk/jfr/internal/Logger.java @ 14458:cb560b38d15a
8266723: JFR periodic events are causing extra allocations
Reviewed-by: adinn
author | jbachorik |
---|---|
date | Fri, 07 May 2021 17:23:30 +0200 |
parents | e5ca85be5681 |
children |
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/* * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package jdk.jfr.internal; import java.util.function.Supplier; /** * JFR logger * */ public final class Logger { private final static int MAX_SIZE = 10000; static { // This will try to initialize the JVM logging system JVMSupport.tryToInitializeJVM(); } public static void log(LogTag logTag, LogLevel logLevel, String message) { if (shouldLog(logTag, logLevel)) { logInternal(logTag, logLevel, message); } } public static void log(LogTag logTag, LogLevel logLevel, Supplier<String> messageSupplier) { if (shouldLog(logTag, logLevel)) { logInternal(logTag, logLevel, messageSupplier.get()); } } private static void logInternal(LogTag logTag, LogLevel logLevel, String message) { if (message == null || message.length() < MAX_SIZE) { JVM.log(logTag.id, logLevel.level, message); } else { JVM.log(logTag.id, logLevel.level, message.substring(0, MAX_SIZE)); } } public static boolean shouldLog(LogTag tag, LogLevel level) { return JVM.shouldLog(level.level); } }