1 files changed, 66 insertions, 0 deletions
diff --git a/chrome/browser/net/sdch_dictionary_fetcher.h b/chrome/browser/net/sdch_dictionary_fetcher.h
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+++ b/chrome/browser/net/sdch_dictionary_fetcher.h
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+// Copyright (c) 2006-2008 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.
+
+// Support modularity by calling to load a new SDCH filter dictionary.
+// Note that this sort of calling can't be done in the /net directory, as it has
+// no concept of the HTTP cache (which is only visible at the browser level).
+
+#ifndef CHROME_BROWSER_NET_SDCH_DICTIONARY_FETCHER_H_
+#define CHROME_BROWSER_NET_SDCH_DICTIONARY_FETCHER_H_
+
+#include <queue>
+#include <string>
+
+#include "base/task.h"
+#include "chrome/browser/url_fetcher.h"
+#include "net/base/sdch_manager.h"
+
+class SdchDictionaryFetcher : public URLFetcher::Delegate,
+                              public SdchFetcher {
+ public:
+  #pragma warning(suppress: 4355)  // OK to pass "this" here.
+  SdchDictionaryFetcher() : method_factory_(this), task_is_pending_(false) {}
+  virtual ~SdchDictionaryFetcher() {}
+
+  // Implementation of SdchFetcher class.
+  // This method gets the requested dictionary, and then calls back into the
+  // SdchManager class with the dictionary's text.
+  virtual void Schedule(const GURL& dictionary_url);
+
+ private:
+  // Delay between Schedule and actual download.
+  static const int kMsDelayFromRequestTillDownload = 15000;
+
+  // Ensure the download after the above delay.
+  void ScheduleDelayedRun();
+
+  // Make sure we're processing (or waiting for) the the arrival of the next URL
+  // in the  |fetch_queue_|.
+  void StartFetching();
+
+  // Implementation of URLFetcher::Delegate. Called after transmission
+  // completes (either successfully or with failure).
+  virtual void OnURLFetchComplete(const URLFetcher* source,
+                                  const GURL& url,
+                                  const URLRequestStatus& status,
+                                  int response_code,
+                                  const ResponseCookies& cookies,
+                                  const std::string& data);
+
+  // A queue of URLs that are being used to download dictionaries.
+  std::queue<GURL> fetch_queue_;
+  // The currently outstanding URL fetch of a dicitonary.
+  // If this is null, then there is no outstanding request.
+  scoped_ptr<URLFetcher> current_fetch_;
+
+  // Always spread out the dictionary fetches, so that they don't steal
+  // bandwidth from the actual page load.  Create delayed tasks to spread out
+  // the download.
+  ScopedRunnableMethodFactory<SdchDictionaryFetcher> method_factory_;
+  bool task_is_pending_;
+
+  DISALLOW_COPY_AND_ASSIGN(SdchDictionaryFetcher);
+};
+
+#endif  // CHROME_BROWSER_NET_SDCH_DICTIONARY_FETCHER_H_