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// Copyright 2015 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 COMPONENTS_TRACING_CHILD_MEMORY_DUMP_MANAGER_DELEGATE_IMPL_H_
#define COMPONENTS_TRACING_CHILD_MEMORY_DUMP_MANAGER_DELEGATE_IMPL_H_
#include "base/trace_event/memory_dump_manager.h"
#include "base/memory/ref_counted.h"
#include "base/memory/singleton.h"
namespace base {
class SingleThreadTaskRunner;
} // namespace base
namespace tracing {
class ChildTraceMessageFilter;
// This class is a simple proxy class between the MemoryDumpManager and the
// ChildTraceMessageFilter. It's only purpose is to adapt the lifetime of
// CTMF to the demands of MDM, which expects the delegate to be thread-safe
// and long lived. CTMF, instead, can be torn down during browser shutdown.
// This class is registered as MDM delegate in child processes and handles
// gracefully (and thread-safely) failures in the case of a lack of the CTMF.
class ChildMemoryDumpManagerDelegateImpl
: public base::trace_event::MemoryDumpManagerDelegate {
public:
static ChildMemoryDumpManagerDelegateImpl* GetInstance();
// base::trace_event::MemoryDumpManagerDelegate implementation.
void RequestGlobalMemoryDump(
const base::trace_event::MemoryDumpRequestArgs& args,
const base::trace_event::MemoryDumpCallback& callback) override;
bool IsCoordinatorProcess() const override;
uint64 GetTracingProcessId() const override;
void SetChildTraceMessageFilter(ChildTraceMessageFilter* ctmf);
// Pass kInvalidTracingProcessId to invalidate the id.
void set_tracing_process_id(uint64 id) {
DCHECK_IMPLIES(
tracing_process_id_ !=
base::trace_event::MemoryDumpManager::kInvalidTracingProcessId,
id == base::trace_event::MemoryDumpManager::kInvalidTracingProcessId ||
id == tracing_process_id_);
tracing_process_id_ = id;
}
protected:
// Make CreateProcessDump() visible to ChildTraceMessageFilter.
friend class ChildTraceMessageFilter;
private:
friend struct DefaultSingletonTraits<ChildMemoryDumpManagerDelegateImpl>;
ChildMemoryDumpManagerDelegateImpl();
~ChildMemoryDumpManagerDelegateImpl() override;
ChildTraceMessageFilter* ctmf_; // Not owned.
// The SingleThreadTaskRunner where the |ctmf_| lives.
// It is NULL iff |cmtf_| is NULL.
scoped_refptr<base::SingleThreadTaskRunner> ctmf_task_runner_;
// The unique id of the child process, created for tracing and is expected to
// be valid only when tracing is enabled.
uint64 tracing_process_id_;
DISALLOW_COPY_AND_ASSIGN(ChildMemoryDumpManagerDelegateImpl);
};
} // namespace tracing
#endif // COMPONENTS_TRACING_CHILD_MEMORY_DUMP_MANAGER_DELEGATE_IMPL_H_
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