| // Copyright 2015 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: cheesy@google.com (Steve Hill) |
| |
| #ifndef PAGESPEED_CONTROLLER_NAMED_LOCK_SCHEDULE_REWRITE_CONTROLLER_H_ |
| #define PAGESPEED_CONTROLLER_NAMED_LOCK_SCHEDULE_REWRITE_CONTROLLER_H_ |
| |
| #include <unordered_set> |
| |
| #include "pagespeed/kernel/base/abstract_mutex.h" |
| #include "pagespeed/controller/schedule_rewrite_controller.h" |
| #include "pagespeed/kernel/base/basictypes.h" |
| #include "pagespeed/kernel/base/function.h" |
| #include "pagespeed/kernel/base/rde_hash_map.h" |
| #include "pagespeed/kernel/base/statistics.h" |
| #include "pagespeed/kernel/base/string.h" |
| #include "pagespeed/kernel/base/string_hash.h" |
| #include "pagespeed/kernel/base/scoped_ptr.h" |
| #include "pagespeed/kernel/base/named_lock_manager.h" |
| #include "pagespeed/kernel/base/thread_annotations.h" |
| #include "pagespeed/kernel/base/thread_system.h" |
| |
| namespace net_instaweb { |
| |
| // Implements ScheduleRewriteController by wrapping NamedLockManager. |
| // This is a backwards compatible implementation, for use in CentralController. |
| class NamedLockScheduleRewriteController : public ScheduleRewriteController { |
| public: |
| static const char kLocksGranted[]; |
| static const char kLocksDenied[]; |
| static const char kLocksStolen[]; |
| static const char kLocksReleasedWhenNotHeld[]; |
| static const char kLocksCurrentlyHeld[]; |
| |
| static const int kStealMs; |
| |
| NamedLockScheduleRewriteController(NamedLockManager* lock_manager, |
| ThreadSystem* thread_system, |
| Statistics* statistics); |
| virtual ~NamedLockScheduleRewriteController(); |
| |
| // ScheduleRewriteController interface. |
| virtual void ScheduleRewrite(const GoogleString& key, Function* callback); |
| virtual void NotifyRewriteComplete(const GoogleString& key); |
| virtual void NotifyRewriteFailed(const GoogleString& key); |
| |
| void ShutDown() override; |
| |
| static void InitStats(Statistics* stats); |
| |
| private: |
| struct LockInfo { |
| LockInfo() : pin_count(0) { } |
| // lock is only non-NULL when we have successfully obtained it. |
| scoped_ptr<NamedLock> lock; |
| |
| std::unordered_set<Function*> pending_callbacks; |
| |
| // "Extra" refcount on top of lock and pending_callbacks we need |
| // occassionally to protect this data against a temporary lock |
| // relinquishment. |
| int pin_count; |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(LockInfo); |
| }; |
| |
| typedef rde::hash_map<GoogleString, LockInfo*, CasePreserveStringHash> |
| LockMap; |
| |
| void LockObtained(Function* callback, const GoogleString key, NamedLock* lock) |
| LOCKS_EXCLUDED(mutex_); |
| void LockFailed(Function* callback, const GoogleString key, NamedLock* lock) |
| LOCKS_EXCLUDED(mutex_); |
| |
| LockInfo* GetLockInfo(const GoogleString& key) |
| EXCLUSIVE_LOCKS_REQUIRED(mutex_); |
| void DeleteInfoIfUnused(LockInfo* info, const GoogleString& key) |
| EXCLUSIVE_LOCKS_REQUIRED(mutex_); |
| |
| scoped_ptr<AbstractMutex> mutex_; |
| NamedLockManager* lock_manager_; |
| LockMap locks_ GUARDED_BY(mutex_); |
| bool shut_down_ GUARDED_BY(mutex_); |
| |
| TimedVariable* locks_granted_; |
| TimedVariable* locks_denied_; |
| TimedVariable* locks_stolen_; |
| TimedVariable* locks_released_when_not_held_; |
| UpDownCounter* locks_currently_held_; |
| |
| DISALLOW_COPY_AND_ASSIGN(NamedLockScheduleRewriteController); |
| }; |
| |
| } // namespace net_instaweb |
| |
| #endif // PAGESPEED_CONTROLLER_NAMED_LOCK_SCHEDULE_REWRITE_CONTROLLER_H_ |