| // Copyright (c) 2012 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. |
| |
| #ifndef SYNC_ENGINE_SYNC_SESSION_JOB_H_ |
| #define SYNC_ENGINE_SYNC_SESSION_JOB_H_ |
| |
| #include "base/memory/scoped_ptr.h" |
| #include "base/time.h" |
| #include "base/tracked_objects.h" |
| #include "sync/engine/sync_scheduler.h" |
| #include "sync/engine/syncer.h" |
| #include "sync/sessions/sync_session.h" |
| |
| namespace syncer { |
| |
| class SyncSessionJob { |
| public: |
| enum Purpose { |
| // Uninitialized state, should never be hit in practice. |
| UNKNOWN = -1, |
| // Our poll timer schedules POLL jobs periodically based on a server |
| // assigned poll interval. |
| POLL, |
| // A nudge task can come from a variety of components needing to force |
| // a sync. The source is inferable from |session.source()|. |
| NUDGE, |
| // Typically used for fetching updates for a subset of the enabled types |
| // during initial sync or reconfiguration. |
| CONFIGURATION, |
| }; |
| |
| SyncSessionJob(Purpose purpose, |
| base::TimeTicks start, |
| scoped_ptr<sessions::SyncSession> session, |
| const ConfigurationParams& config_params, |
| const tracked_objects::Location& nudge_location); |
| ~SyncSessionJob(); |
| |
| // Returns a new clone of the job, with a cloned SyncSession ready to be |
| // retried / rescheduled. The returned job will *never* be a canary, |
| // regardless of |this|. A job can only be cloned once it has finished, |
| // to prevent bugs where multiple jobs are scheduled with the same session. |
| // Use CloneAndAbandon if you want to clone before finishing. |
| scoped_ptr<SyncSessionJob> Clone() const; |
| scoped_ptr<SyncSessionJob> CloneFromLocation( |
| const tracked_objects::Location& from_here) const; |
| |
| // Same as Clone() above, but also ejects the SyncSession from this job, |
| // preventing it from ever being used for a sync cycle. |
| scoped_ptr<SyncSessionJob> CloneAndAbandon(); |
| |
| // Record that the scheduler has deemed the job as finished and give it a |
| // chance to perform any remaining cleanup and/or notification completion |
| // callback invocations. |
| // |early_exit| specifies whether the job 1) cycled through all the |
| // SyncerSteps it needed, or 2) was pre-empted by the scheduler. |
| // Returns true if we completely ran the session without errors. |
| // There are many errors that could prevent a sync cycle from succeeding, |
| // such as invalid local state, inability to contact the server, inability |
| // to authenticate with the server, and server errors. What they have in |
| // common is that the we either need to take some action and then retry the |
| // sync cycle or, in the case of transient errors, retry after some backoff |
| // timer has expired. Most importantly, the SyncScheduler should not assume |
| // that the original action that triggered the sync cycle (ie. a nudge or a |
| // notification) has been properly serviced. |
| bool Finish(bool early_exit); |
| |
| // Causes is_canary() to return true. Use with caution. |
| void GrantCanaryPrivilege(); |
| |
| static const char* GetPurposeString(Purpose purpose); |
| static void GetSyncerStepsForPurpose(Purpose purpose, |
| SyncerStep* start, |
| SyncerStep* end); |
| |
| bool is_canary() const; |
| Purpose purpose() const; |
| base::TimeTicks scheduled_start() const; |
| void set_scheduled_start(base::TimeTicks start); |
| const sessions::SyncSession* session() const; |
| sessions::SyncSession* mutable_session(); |
| const tracked_objects::Location& from_location() const; |
| SyncerStep start_step() const; |
| SyncerStep end_step() const; |
| ConfigurationParams config_params() const; |
| |
| private: |
| // A SyncSessionJob can be in one of these three states, controlled by the |
| // Finish() function, see method comments. |
| enum FinishedState { |
| NOT_FINISHED, // Finish has not been called. |
| EARLY_EXIT, // Finish was called but the job was "preempted", |
| FINISHED // Indicates a "clean" finish operation. |
| }; |
| |
| scoped_ptr<sessions::SyncSession> CloneSession() const; |
| |
| const Purpose purpose_; |
| |
| base::TimeTicks scheduled_start_; |
| scoped_ptr<sessions::SyncSession> session_; |
| bool is_canary_; |
| |
| // Only used for purpose_ == CONFIGURATION. This, and different Finish() and |
| // Succeeded() behavior may be arguments to subclass in the future. |
| const ConfigurationParams config_params_; |
| |
| // Set to true if Finish() was called, false otherwise. True implies that |
| // a SyncShare operation took place with |session_| and it cycled through |
| // all requisite steps given |purpose_| without being preempted. |
| FinishedState finished_; |
| |
| // This is the location the job came from. Used for debugging. |
| // In case of multiple nudges getting coalesced this stores the |
| // first location that came in. |
| tracked_objects::Location from_location_; |
| |
| DISALLOW_COPY_AND_ASSIGN(SyncSessionJob); |
| }; |
| |
| } // namespace syncer |
| |
| #endif // SYNC_ENGINE_SYNC_SESSION_JOB_H_ |