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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef PerformanceMetricsCollector_h
#define PerformanceMetricsCollector_h
#include "nsIObserver.h"
#include "nsITimer.h"
#include "nsID.h"
#include "nsTHashMap.h"
#include "mozilla/dom/ChromeUtilsBinding.h" // defines PerformanceInfoDictionary
#include "mozilla/dom/DOMTypes.h" // defines PerformanceInfo
#include "mozilla/PerformanceTypes.h"
namespace mozilla {
namespace dom {
class Promise;
}
class PerformanceMetricsCollector;
class AggregatedResults;
class IPCTimeout final : public nsITimerCallback, public nsINamed {
public:
NS_DECL_NSITIMERCALLBACK
NS_DECL_NSINAMED
NS_DECL_ISUPPORTS
static IPCTimeout* CreateInstance(AggregatedResults* aResults);
void Cancel();
private:
IPCTimeout(AggregatedResults* aResults, uint32_t aDelay);
~IPCTimeout();
nsCOMPtr<nsITimer> mTimer;
AggregatedResults* mResults;
};
// AggregatedResults receives PerformanceInfo results that are collected
// asynchronously via IPDL from all content processes.
// They are converted into an array of
// PerformanceInfoDictionary dictionaries (webidl)
//
// Once every process have sent back its results, AggregatedResults will
// resolve the MozPromise returned by GetPromise()
// with all the collected data.
//
// See ChromeUtils::RequestPerformanceMetrics.
class AggregatedResults final {
public:
AggregatedResults(nsID aUUID, PerformanceMetricsCollector* aCollector);
~AggregatedResults() = default;
void AppendResult(const nsTArray<dom::PerformanceInfo>& aMetrics);
void SetNumResultsRequired(uint32_t aNumResultsRequired);
void Abort(nsresult aReason);
void ResolveNow();
RefPtr<RequestMetricsPromise> GetPromise();
private:
RefPtr<IPCTimeout> mIPCTimeout;
MozPromiseHolder<RequestMetricsPromise> mHolder;
uint32_t mPendingResults;
FallibleTArray<dom::PerformanceInfoDictionary> mData;
// AggregatedResults keeps a reference on the collector
// so it gets destructed when all pending AggregatedResults
// are themselves destructed when removed from
// PerformanceMetricsCollector::mAggregatedResults.
//
// This lifecycle ensures that everything is released once
// all pending results are sent.
RefPtr<PerformanceMetricsCollector> mCollector;
nsID mUUID;
};
//
// PerformanceMetricsCollector is instanciated as a singleton, and creates
// one AggregatedResults instance everytime metrics are requested.
//
// Each AggregatedResults has a unique identifier (UUID) that is used
// to send metrics requests via IPDL. When metrics are back in an
// asynchronous fashion, the UUID is used to append the data to the
// right AggregatedResults instance and eventually let it resolve the
// linked promise.
//
class PerformanceMetricsCollector final {
public:
NS_INLINE_DECL_REFCOUNTING(PerformanceMetricsCollector)
static RefPtr<RequestMetricsPromise> RequestMetrics();
static nsresult DataReceived(const nsID& aUUID,
const nsTArray<dom::PerformanceInfo>& aMetrics);
void ForgetAggregatedResults(const nsID& aUUID);
private:
~PerformanceMetricsCollector();
RefPtr<RequestMetricsPromise> RequestMetricsInternal();
nsresult DataReceivedInternal(const nsID& aUUID,
const nsTArray<dom::PerformanceInfo>& aMetrics);
nsTHashMap<nsID, UniquePtr<AggregatedResults>> mAggregatedResults;
};
} // namespace mozilla
#endif // PerformanceMetricsCollector_h
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