| /* |
| * Copyright 2013 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: anupama@google.com (Anupama Dutta) |
| |
| #ifndef NET_INSTAWEB_REWRITER_PUBLIC_DOWNSTREAM_CACHE_PURGER_H_ |
| #define NET_INSTAWEB_REWRITER_PUBLIC_DOWNSTREAM_CACHE_PURGER_H_ |
| |
| #include "pagespeed/kernel/base/basictypes.h" |
| #include "pagespeed/kernel/base/string.h" |
| |
| namespace net_instaweb { |
| class GoogleUrl; |
| class RewriteDriver; |
| |
| // This class acts as a wrapper class for issuing purge requests to downstream |
| // caches. |
| class DownstreamCachePurger { |
| public: |
| explicit DownstreamCachePurger(RewriteDriver* driver); |
| ~DownstreamCachePurger(); |
| |
| // Issues the purge request if the request headers, the purge-related options |
| // and the amount of rewriting completed satisfy certain conditions. |
| // Returns true if purge request was issued and false otherwise. |
| bool MaybeIssuePurge(const GoogleUrl& google_url); |
| |
| void Clear(); |
| |
| private: |
| // Check rewrite options specified for downstream caching behavior and |
| // amount of rewriting initiated and completed to decide whether the |
| // fully rewritten response is significantly better than the stored |
| // version and whether the currently stored version ought to be purged. |
| bool ShouldPurgeRewrittenResponse(const GoogleUrl& google_url); |
| |
| // Construct the purge URL and decide on the purge HTTP method (GET, PURGE |
| // etc.) based on the rewrite options. |
| bool GeneratePurgeRequestParameters(const GoogleUrl& page_url); |
| |
| // Initiates a purge request fetch. |
| void PurgeDownstreamCache(); |
| |
| RewriteDriver* driver_; |
| GoogleString purge_url_; |
| GoogleString purge_method_; |
| |
| // Set to true if we already made a purge request to the downstream cache, |
| // so we don't keep trying to do it. Note that there is never more than one |
| // DownstreamCachePurger object per RewriteDriver. |
| bool made_downstream_purge_attempt_; |
| |
| DISALLOW_COPY_AND_ASSIGN(DownstreamCachePurger); |
| }; |
| |
| } // namespace net_instaweb |
| |
| #endif // NET_INSTAWEB_REWRITER_PUBLIC_DOWNSTREAM_CACHE_PURGER_H_ |