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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.
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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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*/
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#ifndef SHARE_VM_JFR_RECORDER_STRINGPOOL_JFRSTRINGPOOL_HPP
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#define SHARE_VM_JFR_RECORDER_STRINGPOOL_JFRSTRINGPOOL_HPP
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#include "jni.h"
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#include "jfr/recorder/storage/jfrMemorySpace.hpp"
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#include "jfr/recorder/storage/jfrMemorySpaceRetrieval.hpp"
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#include "jfr/recorder/stringpool/jfrStringPoolBuffer.hpp"
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class JfrChunkWriter;
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class JfrStringPool;
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class Mutex;
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typedef JfrMemorySpace<JfrStringPoolBuffer, JfrMspaceSequentialRetrieval, JfrStringPool> JfrStringPoolMspace;
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//
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// Although called JfrStringPool, a more succinct description would be
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// "backing storage for the string pool located in Java"
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//
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// There are no lookups in native, only the encoding of string constants to the stream.
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//
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class JfrStringPool : public JfrCHeapObj {
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public:
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static bool add(bool epoch, jlong id, jstring string, JavaThread* jt);
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size_t write();
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size_t write_at_safepoint();
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size_t clear();
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typedef JfrStringPoolMspace::Type Buffer;
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private:
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JfrStringPoolMspace* _free_list_mspace;
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Mutex* _lock;
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JfrChunkWriter& _chunkwriter;
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// mspace callback
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void register_full(Buffer* t, Thread* thread);
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void lock();
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void unlock();
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DEBUG_ONLY(bool is_locked() const;)
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static Buffer* lease_buffer(Thread* thread, size_t size = 0);
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static Buffer* flush(Buffer* old, size_t used, size_t requested, Thread* t);
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JfrStringPool(JfrChunkWriter& cw);
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~JfrStringPool();
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static JfrStringPool& instance();
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static JfrStringPool* create(JfrChunkWriter& cw);
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bool initialize();
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static void destroy();
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friend class JfrRecorder;
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friend class JfrRecorderService;
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friend class JfrStringPoolFlush;
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friend class JfrStringPoolWriter;
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template <typename, template <typename> class, typename>
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friend class JfrMemorySpace;
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};
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#endif // SHARE_VM_JFR_RECORDER_STRINGPOOL_JFRSTRINGPOOL_HPP
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