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/*
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* Copyright (c) 2014, 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_LEAKPROFILER_SAMPLING_OBJECTSAMPLE_HPP
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#define SHARE_VM_JFR_LEAKPROFILER_SAMPLING_OBJECTSAMPLE_HPP
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#include "jfr/recorder/checkpoint/jfrCheckpointBlob.hpp"
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#include "jfr/utilities/jfrAllocation.hpp"
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#include "jfr/utilities/jfrTime.hpp"
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#include "jfr/utilities/jfrTypes.hpp"
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#include "memory/allocation.hpp"
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#include "oops/oop.hpp"
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#include "utilities/ticks.hpp"
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/*
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* Handle for diagnosing Java memory leaks.
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*
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* The class tracks the time the object was
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* allocated, the thread and the stack trace.
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*/
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class ObjectSample : public JfrCHeapObj {
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friend class ObjectSampler;
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friend class SampleList;
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private:
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ObjectSample* _next;
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ObjectSample* _previous;
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JfrCheckpointBlobHandle _thread_cp;
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JfrCheckpointBlobHandle _klass_cp;
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oop _object;
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Ticks _allocation_time;
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traceid _stack_trace_id;
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traceid _thread_id;
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int _index;
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size_t _span;
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size_t _allocated;
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unsigned int _stack_trace_hash;
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bool _dead;
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void set_dead() {
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_dead = true;
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}
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void release_references() {
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if (_thread_cp.valid()) {
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_thread_cp.~JfrCheckpointBlobHandle();
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}
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if (_klass_cp.valid()) {
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_klass_cp.~JfrCheckpointBlobHandle();
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}
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}
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void reset() {
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set_stack_trace_id(0);
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set_stack_trace_hash(0),
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release_references();
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_dead = false;
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}
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public:
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ObjectSample() : _next(NULL),
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_previous(NULL),
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_thread_cp(),
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_klass_cp(),
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_object(NULL),
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_allocation_time(),
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_stack_trace_id(0),
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_thread_id(0),
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_index(0),
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_span(0),
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_allocated(0),
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_stack_trace_hash(0),
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_dead(false) {}
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ObjectSample* next() const {
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return _next;
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}
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void set_next(ObjectSample* next) {
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_next = next;
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}
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ObjectSample* prev() const {
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return _previous;
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}
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void set_prev(ObjectSample* prev) {
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_previous = prev;
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}
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bool is_dead() const {
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return _dead;
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}
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const oop object() const {
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return _object;
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}
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const oop* object_addr() const {
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return &_object;
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}
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void set_object(oop object) {
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_object = object;
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}
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const Klass* klass() const {
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assert(_object != NULL, "invariant");
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return _object->klass();
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}
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int index() const {
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return _index;
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}
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void set_index(int index) {
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_index = index;
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}
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size_t span() const {
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return _span;
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}
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void set_span(size_t span) {
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_span = span;
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}
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void add_span(size_t span) {
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_span += span;
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}
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size_t allocated() const {
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return _allocated;
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}
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void set_allocated(size_t size) {
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_allocated = size;
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}
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const Ticks& allocation_time() const {
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return _allocation_time;
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}
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const void set_allocation_time(const JfrTicks& time) {
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_allocation_time = Ticks(time.value());
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}
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bool has_stack_trace() const {
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return stack_trace_id() != 0;
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}
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traceid stack_trace_id() const {
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return _stack_trace_id;
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}
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void set_stack_trace_id(traceid id) {
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_stack_trace_id = id;
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}
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unsigned int stack_trace_hash() const {
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return _stack_trace_hash;
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}
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void set_stack_trace_hash(unsigned int hash) {
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_stack_trace_hash = hash;
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}
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bool has_thread() const {
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return _thread_id != 0;
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}
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traceid thread_id() const {
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return _thread_id;
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}
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void set_thread_id(traceid id) {
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_thread_id = id;
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}
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bool is_alive_and_older_than(jlong time_stamp) const {
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return !is_dead() && (JfrTime::is_ft_enabled() ?
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_allocation_time.ft_value() : _allocation_time.value()) < time_stamp;
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}
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const JfrCheckpointBlobHandle& thread_checkpoint() const {
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return _thread_cp;
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}
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bool has_thread_checkpoint() const {
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return _thread_cp.valid();
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}
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// JfrCheckpointBlobHandle assignment operator
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// maintains proper reference counting
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void set_thread_checkpoint(const JfrCheckpointBlobHandle& ref) {
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if (_thread_cp != ref) {
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_thread_cp = ref;
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}
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}
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const JfrCheckpointBlobHandle& klass_checkpoint() const {
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return _klass_cp;
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}
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bool has_klass_checkpoint() const {
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return _klass_cp.valid();
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}
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void set_klass_checkpoint(const JfrCheckpointBlobHandle& ref) {
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if (_klass_cp != ref) {
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if (_klass_cp.valid()) {
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_klass_cp->set_next(ref);
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return;
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}
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_klass_cp = ref;
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}
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}
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};
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#endif // SHARE_VM_JFR_LEAKPROFILER_SAMPLING_OBJECTSAMPLE_HPP
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