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diff --git a/chromium/components/policy/core/common/cloud/external_policy_data_updater.h b/chromium/components/policy/core/common/cloud/external_policy_data_updater.h
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-// Copyright (c) 2013 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_POLICY_CORE_COMMON_CLOUD_EXTERNAL_POLICY_DATA_UPDATER_H_
-#define COMPONENTS_POLICY_CORE_COMMON_CLOUD_EXTERNAL_POLICY_DATA_UPDATER_H_
-
-#include <map>
-#include <queue>
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/callback_forward.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/weak_ptr.h"
-#include "components/policy/policy_export.h"
-
-namespace base {
-class SequencedTaskRunner;
-}
-
-namespace policy {
-
-class ExternalPolicyDataFetcher;
-
-// This class downloads external policy data. Given a |Request|, data is fetched
-// from the |url|, verified to not exceed |max_size| and to match the expected
-// |hash| and then handed to a callback that can do further verification before
-// finally deciding whether the fetched data is valid.
-// If a fetch is not successful or retrieves invalid data, retries are scheduled
-// with exponential backoff.
-// The actual fetching is handled by an ExternalPolicyDataFetcher, allowing this
-// class to run on a background thread where network I/O is not possible.
-class POLICY_EXPORT ExternalPolicyDataUpdater {
- public:
- struct POLICY_EXPORT Request {
- public:
- Request();
- Request(const std::string& url, const std::string& hash, int64 max_size);
-
- bool operator==(const Request& other) const;
-
- std::string url;
- std::string hash;
- int64 max_size;
- };
-
- // This callback is invoked when a fetch has successfully retrieved |data|
- // that does not exceed |max_size| and matches the expected |hash|. The
- // callback can do further verification to decide whether the fetched data is
- // valid.
- // If the callback returns |true|, the data is accepted and the |Request| is
- // finished. If the callback returns |false|, the data is rejected and the
- // fetch is retried after a long backoff. Note that in this case, the callback
- // may be invoked multiple times as the fetch is repeated. Make sure to not
- // bind base::Passed() scoped_ptrs to the callback in such cases as these
- // become invalid after a callback has been run once. base::Owned() can be
- // used in all cases.
- typedef base::Callback<bool(const std::string&)> FetchSuccessCallback;
-
- // This class runs on the background thread represented by |task_runner|,
- // which must support file I/O. All network I/O is forwarded to a different
- // thread by the |external_policy_data_fetcher|.
- ExternalPolicyDataUpdater(
- scoped_refptr<base::SequencedTaskRunner> task_runner,
- scoped_ptr<ExternalPolicyDataFetcher> external_policy_data_fetcher,
- size_t max_parallel_fetches);
- ~ExternalPolicyDataUpdater();
-
- // Fetches the external data specified in the |request|. The |key| is an
- // opaque identifier. If another request for the same |key| is still pending,
- // it will be canceled and replaced with the new |request|. The callback will
- // be invoked after a successful fetch. See the documentation of
- // |FetchSuccessCallback| for more details.
- void FetchExternalData(const std::string key,
- const Request& request,
- const FetchSuccessCallback& callback);
-
- // Cancels the pending request identified by |key|. If no such request is
- // pending, does nothing.
- void CancelExternalDataFetch(const std::string& key);
-
- private:
- class FetchJob;
-
- // Starts jobs from the |job_queue_| until |max_parallel_jobs_| are running or
- // the queue is depleted.
- void StartNextJobs();
-
- // Appends |job| to the |job_queue_| and starts it immediately if less than
- // |max_parallel_jobs_| are running.
- void ScheduleJob(FetchJob* job);
-
- // Callback for jobs that succeeded.
- void OnJobSucceeded(FetchJob* job);
-
- // Callback for jobs that failed.
- void OnJobFailed(FetchJob* job);
-
- scoped_refptr<base::SequencedTaskRunner> task_runner_;
- scoped_ptr<ExternalPolicyDataFetcher> external_policy_data_fetcher_;
-
- // The maximum number of jobs to run in parallel.
- size_t max_parallel_jobs_;
-
- // The number of jobs currently running.
- size_t running_jobs_;
-
- // Queue of jobs waiting to be run. Jobs are taken off the queue and started
- // by StartNextJobs().
- std::queue<base::WeakPtr<FetchJob> > job_queue_;
-
- // Map that owns all existing jobs, regardless of whether they are currently
- // queued, running or waiting for a retry.
- std::map<std::string, FetchJob*> job_map_;
-
- // |True| once the destructor starts. Prevents jobs from being started during
- // shutdown.
- bool shutting_down_;
-
- DISALLOW_COPY_AND_ASSIGN(ExternalPolicyDataUpdater);
-};
-
-} // namespace policy
-
-#endif // COMPONENTS_POLICY_CORE_COMMON_CLOUD_EXTERNAL_POLICY_DATA_UPDATER_H_