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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.
#include "chrome/browser/net/sdch_dictionary_fetcher.h"
#include "base/compiler_specific.h"
#include "chrome/browser/profile.h"
#include "net/url_request/url_request_status.h"
SdchDictionaryFetcher::SdchDictionaryFetcher()
: ALLOW_THIS_IN_INITIALIZER_LIST(method_factory_(this)),
task_is_pending_(false) {
}
SdchDictionaryFetcher::~SdchDictionaryFetcher() {
}
void SdchDictionaryFetcher::Schedule(const GURL& dictionary_url) {
// Avoid pushing duplicate copy onto queue. We may fetch this url again later
// and get a different dictionary, but there is no reason to have it in the
// queue twice at one time.
if (!fetch_queue_.empty() && fetch_queue_.back() == dictionary_url) {
SdchManager::SdchErrorRecovery(
SdchManager::DICTIONARY_ALREADY_SCHEDULED_TO_DOWNLOAD);
return;
}
if (attempted_load_.find(dictionary_url) != attempted_load_.end()) {
SdchManager::SdchErrorRecovery(
SdchManager::DICTIONARY_ALREADY_TRIED_TO_DOWNLOAD);
return;
}
attempted_load_.insert(dictionary_url);
fetch_queue_.push(dictionary_url);
ScheduleDelayedRun();
}
void SdchDictionaryFetcher::ScheduleDelayedRun() {
if (fetch_queue_.empty() || current_fetch_.get() || task_is_pending_)
return;
MessageLoop::current()->PostDelayedTask(FROM_HERE,
method_factory_.NewRunnableMethod(&SdchDictionaryFetcher::StartFetching),
kMsDelayFromRequestTillDownload);
task_is_pending_ = true;
}
void SdchDictionaryFetcher::StartFetching() {
DCHECK(task_is_pending_);
task_is_pending_ = false;
URLRequestContextGetter* context = Profile::GetDefaultRequestContext();
if (!context) {
// Shutdown in progress.
// Simulate handling of all dictionary requests by clearing queue.
while (!fetch_queue_.empty())
fetch_queue_.pop();
return;
}
current_fetch_.reset(new URLFetcher(fetch_queue_.front(), URLFetcher::GET,
this));
fetch_queue_.pop();
current_fetch_->set_request_context(context);
current_fetch_->Start();
}
void SdchDictionaryFetcher::OnURLFetchComplete(const URLFetcher* source,
const GURL& url,
const URLRequestStatus& status,
int response_code,
const ResponseCookies& cookies,
const std::string& data) {
if ((200 == response_code) && (status.status() == URLRequestStatus::SUCCESS))
SdchManager::Global()->AddSdchDictionary(data, url);
current_fetch_.reset(NULL);
ScheduleDelayedRun();
}
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