| /* |
| * Copyright 2012 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| // Author: morlovichz@google.com (Maksim Orlovich) |
| // Wrapper around a UrlAsyncFetcher that adds statistics and histograms. |
| |
| #ifndef NET_INSTAWEB_HTTP_PUBLIC_URL_ASYNC_FETCHER_STATS_H_ |
| #define NET_INSTAWEB_HTTP_PUBLIC_URL_ASYNC_FETCHER_STATS_H_ |
| |
| #include "net/instaweb/http/public/url_async_fetcher.h" |
| #include "pagespeed/kernel/base/basictypes.h" |
| #include "pagespeed/kernel/base/string.h" |
| #include "pagespeed/kernel/base/string_util.h" |
| |
| namespace net_instaweb { |
| |
| class AsyncFetch; |
| class Histogram; |
| class MessageHandler; |
| class Statistics; |
| class Timer; |
| class Variable; |
| |
| class UrlAsyncFetcherStats : public UrlAsyncFetcher { |
| public: |
| // Creates a fetcher that delegates to base_fetcher, while collecting |
| // statistics. The variables will be prefixed with 'prefix'; which must |
| // have been passed to ::InitStats during statistics initialization process. |
| // |
| // Note that base_fetcher should not have fetch_with_gzip() as it would break |
| // usage metering; if you want that functionality you should turn it off on |
| // base_fetcher and turn it on UrlAsyncFetcherStats. |
| // |
| // Does not own base_fetcher (so you can have multiple UrlAsyncFetcherStats |
| // objects around a single UrlAsyncFetcher object). |
| UrlAsyncFetcherStats(StringPiece prefix, |
| UrlAsyncFetcher* base_fetcher, |
| Timer* timer, |
| Statistics* statistics); |
| virtual ~UrlAsyncFetcherStats(); |
| |
| // This must be called once for every unique prefix used with |
| // UrlAsyncFetcherStats. |
| static void InitStats(StringPiece prefix, Statistics* statistics); |
| |
| // Reimplementation of UrlAsyncFetcher methods. See base class |
| // for API specifications. |
| virtual bool SupportsHttps() const; |
| virtual void Fetch(const GoogleString& url, |
| MessageHandler* message_handler, |
| AsyncFetch* fetch); |
| virtual int64 timeout_ms(); |
| virtual void ShutDown(); |
| |
| private: |
| class StatsAsyncFetch; |
| |
| UrlAsyncFetcher* base_fetcher_; |
| Timer* timer_; |
| |
| Histogram* fetch_latency_us_histogram_; |
| Variable* fetches_; |
| Variable* bytes_fetched_; |
| Variable* approx_header_bytes_fetched_; |
| |
| DISALLOW_COPY_AND_ASSIGN(UrlAsyncFetcherStats); |
| }; |
| |
| } // namespace net_instaweb |
| |
| #endif // NET_INSTAWEB_HTTP_PUBLIC_URL_ASYNC_FETCHER_STATS_H_ |