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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 mozilla_glean_GleanStringList_h
#define mozilla_glean_GleanStringList_h
#include "mozilla/Maybe.h"
#include "nsIGleanMetrics.h"
#include "nsString.h"
#include "nsTArray.h"
namespace mozilla::glean {
namespace impl {
class StringListMetric {
public:
constexpr explicit StringListMetric(uint32_t aId) : mId(aId) {}
/*
* Adds a new string to the list.
*
* Truncates the value if it is longer than 50 bytes and logs an error.
*
* @param aValue The string to add.
*/
void Add(const nsACString& aValue) const;
/*
* Set to a specific list of strings.
*
* Truncates any values longer than 50 bytes and logs an error.
* Truncates the list if it is over 20 items long.
* See
* https://mozilla.github.io/glean/book/user/metrics/string_list.html#limits.
*
* @param aValue The list of strings to set the metric to.
*/
void Set(const nsTArray<nsCString>& aValue) const;
/**
* **Test-only API**
*
* Gets the currently stored value.
*
* This function will attempt to await the last parent-process task (if any)
* writing to the the metric's storage engine before returning a value.
* This function will not wait for data from child processes.
*
* This doesn't clear the stored value.
* Parent process only. Panics in child processes.
*
* @param aPingName The (optional) name of the ping to retrieve the metric
* for. Defaults to the first value in `send_in_pings`.
*
* @return value of the stored metric, or Nothing() if there is no value.
*/
Result<Maybe<nsTArray<nsCString>>, nsCString> TestGetValue(
const nsACString& aPingName = nsCString()) const;
private:
const uint32_t mId;
};
} // namespace impl
class GleanStringList final : public nsIGleanStringList {
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIGLEANSTRINGLIST
explicit GleanStringList(uint32_t aId) : mStringList(aId){};
private:
virtual ~GleanStringList() = default;
const impl::StringListMetric mStringList;
};
} // namespace mozilla::glean
#endif /* mozilla_glean_GleanStringList_h */
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