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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_PARKABLE_STRING_MANAGER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_PARKABLE_STRING_MANAGER_H_
#include "base/feature_list.h"
#include "base/macros.h"
#include "base/memory/scoped_refptr.h"
#include "base/time/time.h"
#include "base/trace_event/memory_dump_provider.h"
#include "third_party/blink/renderer/platform/bindings/parkable_string.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/hash_functions.h"
#include "third_party/blink/renderer/platform/wtf/hash_map.h"
#include "third_party/blink/renderer/platform/wtf/hash_set.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
namespace blink {
class ParkableString;
PLATFORM_EXPORT extern const base::Feature kCompressParkableStrings;
class PLATFORM_EXPORT ParkableStringManagerDumpProvider
: public base::trace_event::MemoryDumpProvider {
USING_FAST_MALLOC(ParkableStringManagerDumpProvider);
public:
static ParkableStringManagerDumpProvider* Instance();
~ParkableStringManagerDumpProvider() override;
bool OnMemoryDump(const base::trace_event::MemoryDumpArgs&,
base::trace_event::ProcessMemoryDump*) override;
private:
ParkableStringManagerDumpProvider();
DISALLOW_COPY_AND_ASSIGN(ParkableStringManagerDumpProvider);
};
// Manages all the ParkableStrings, and parks eligible strings after the
// renderer has been backgrounded.
// Main Thread only.
class PLATFORM_EXPORT ParkableStringManager {
USING_FAST_MALLOC(ParkableStringManager);
public:
struct Statistics;
static ParkableStringManager& Instance();
~ParkableStringManager();
void SetRendererBackgrounded(bool backgrounded);
bool IsRendererBackgrounded() const;
void PurgeMemory();
// Number of parked and unparked strings. Public for testing.
size_t Size() const;
bool OnMemoryDump(base::trace_event::ProcessMemoryDump* pmd);
// Whether a string is parkable or not. Can be called from any thread.
static bool ShouldPark(const StringImpl& string);
// Public for testing.
constexpr static int kAgingIntervalInSeconds = 2;
static const char* kAllocatorDumpName;
private:
friend class ParkableString;
friend class ParkableStringImpl;
struct SecureDigestHash;
scoped_refptr<ParkableStringImpl> Add(scoped_refptr<StringImpl>&&);
void Remove(ParkableStringImpl*);
void OnParked(ParkableStringImpl*);
void OnUnparked(ParkableStringImpl*);
void ParkAll(ParkableStringImpl::ParkingMode mode);
void RecordStatisticsAfter5Minutes() const;
void AgeStringsAndPark();
void ScheduleAgingTaskIfNeeded();
void RecordUnparkingTime(base::TimeDelta);
void RecordParkingThreadTime(base::TimeDelta parking_thread_time) {
total_parking_thread_time_ += parking_thread_time;
}
Vector<ParkableStringImpl*> GetUnparkedStrings() const;
Statistics ComputeStatistics() const;
void ResetForTesting();
ParkableStringManager();
bool backgrounded_;
bool has_pending_aging_task_;
bool has_posted_unparking_time_accounting_task_;
bool did_register_memory_pressure_listener_;
base::TimeDelta total_unparking_time_;
base::TimeDelta total_parking_thread_time_;
// Relies on secure hash equality for deduplication. If one day SHA256 becomes
// insecure, then this would need to be updated to a more robust hash.
WTF::HashMap<const ParkableStringImpl::SecureDigest*,
ParkableStringImpl*,
SecureDigestHash>
unparked_strings_;
WTF::HashMap<const ParkableStringImpl::SecureDigest*,
ParkableStringImpl*,
SecureDigestHash>
parked_strings_;
friend class ParkableStringTest;
FRIEND_TEST_ALL_PREFIXES(ParkableStringTest, SynchronousCompression);
DISALLOW_COPY_AND_ASSIGN(ParkableStringManager);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_PARKABLE_STRING_MANAGER_H_
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