third_party/blink/renderer/modules/webdatabase/quota_tracker.cc

/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
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 *     * Redistributions in binary form must reproduce the above
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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#include "third_party/blink/renderer/modules/webdatabase/quota_tracker.h"

#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/public/platform/web_security_origin.h"
#include "third_party/blink/renderer/platform/weborigin/security_origin.h"
#include "third_party/blink/renderer/platform/wtf/std_lib_extras.h"
#include "third_party/blink/renderer/platform/wtf/threading.h"

namespace blink {

QuotaTracker& QuotaTracker::Instance() {
  DEFINE_THREAD_SAFE_STATIC_LOCAL(QuotaTracker, tracker, ());
  return tracker;
}

void QuotaTracker::GetDatabaseSizeAndSpaceAvailableToOrigin(
    const SecurityOrigin* origin,
    const String& database_name,
    uint64_t* database_size,
    uint64_t* space_available) {
  // Extra scope to unlock prior to potentially calling Platform.
  {
    MutexLocker lock_data(data_guard_);
    DCHECK(database_sizes_.Contains(origin->ToRawString()));
    HashMap<String, SizeMap>::const_iterator it =
        database_sizes_.find(origin->ToRawString());
    DCHECK(it->value.Contains(database_name));
    *database_size = it->value.at(database_name);
  }

  // The embedder hasn't pushed this value to us, so we pull it as needed.
  *space_available = Platform::Current()->DatabaseGetSpaceAvailableForOrigin(
      WebSecurityOrigin(origin));
}

void QuotaTracker::UpdateDatabaseSize(const SecurityOrigin* origin,
                                      const String& database_name,
                                      uint64_t database_size) {
  MutexLocker lock_data(data_guard_);
  HashMap<String, SizeMap>::ValueType* it =
      database_sizes_.insert(origin->ToRawString(), SizeMap()).stored_value;
  it->value.Set(database_name, database_size);
}

}  // namespace blink