| /* |
| * Copyright (c) 2012, 2019, 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. |
| * |
| * 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. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "jfr/jni/jfrJavaSupport.hpp" |
| #include "jfr/recorder/repository/jfrChunkRotation.hpp" |
| #include "jfr/recorder/repository/jfrChunkWriter.hpp" |
| #include "runtime/handles.inline.hpp" |
| |
| static jobject chunk_monitor = NULL; |
| static int64_t threshold = 0; |
| static bool rotate = false; |
| |
| static jobject install_chunk_monitor(Thread* thread) { |
| assert(chunk_monitor == NULL, "invariant"); |
| // read static field |
| HandleMark hm(thread); |
| static const char klass[] = "jdk/jfr/internal/JVM"; |
| static const char field[] = "FILE_DELTA_CHANGE"; |
| static const char signature[] = "Ljava/lang/Object;"; |
| JavaValue result(T_OBJECT); |
| JfrJavaArguments field_args(&result, klass, field, signature, thread); |
| JfrJavaSupport::get_field_global_ref(&field_args, thread); |
| chunk_monitor = result.get_jobject(); |
| return chunk_monitor; |
| } |
| |
| // lazy install |
| static jobject get_chunk_monitor(Thread* thread) { |
| return chunk_monitor != NULL ? chunk_monitor : install_chunk_monitor(thread); |
| } |
| |
| static void notify() { |
| Thread* const thread = Thread::current(); |
| JfrJavaSupport::notify_all(get_chunk_monitor(thread), thread); |
| } |
| |
| void JfrChunkRotation::evaluate(const JfrChunkWriter& writer) { |
| assert(threshold > 0, "invariant"); |
| if (rotate) { |
| // already in progress |
| return; |
| } |
| if (writer.size_written() > threshold) { |
| rotate = true; |
| notify(); |
| } |
| } |
| |
| bool JfrChunkRotation::should_rotate() { |
| return rotate; |
| } |
| |
| void JfrChunkRotation::on_rotation() { |
| rotate = false; |
| } |
| |
| void JfrChunkRotation::set_threshold(int64_t bytes) { |
| threshold = bytes; |
| } |