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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef COMPONENTS_POLICY_CORE_COMMON_POLICY_SERVICE_IMPL_H_
      6 #define COMPONENTS_POLICY_CORE_COMMON_POLICY_SERVICE_IMPL_H_
      7 
      8 #include <map>
      9 #include <set>
     10 #include <string>
     11 #include <vector>
     12 
     13 #include "base/basictypes.h"
     14 #include "base/callback.h"
     15 #include "base/memory/weak_ptr.h"
     16 #include "base/observer_list.h"
     17 #include "components/policy/core/common/configuration_policy_provider.h"
     18 #include "components/policy/core/common/policy_bundle.h"
     19 #include "components/policy/core/common/policy_service.h"
     20 #include "components/policy/policy_export.h"
     21 
     22 namespace policy {
     23 
     24 class PolicyMap;
     25 
     26 class POLICY_EXPORT PolicyServiceImpl
     27     : public PolicyService,
     28       public ConfigurationPolicyProvider::Observer {
     29  public:
     30   typedef std::vector<ConfigurationPolicyProvider*> Providers;
     31 
     32   // The PolicyServiceImpl will merge policies from |providers|. |providers|
     33   // must be sorted in decreasing order of priority; the first provider will
     34   // have the highest priority. The PolicyServiceImpl does not take ownership of
     35   // the providers, and they must outlive the PolicyServiceImpl.
     36   explicit PolicyServiceImpl(const Providers& providers);
     37 
     38   virtual ~PolicyServiceImpl();
     39 
     40   // PolicyService overrides:
     41   virtual void AddObserver(PolicyDomain domain,
     42                            PolicyService::Observer* observer) OVERRIDE;
     43   virtual void RemoveObserver(PolicyDomain domain,
     44                               PolicyService::Observer* observer) OVERRIDE;
     45   virtual const PolicyMap& GetPolicies(
     46       const PolicyNamespace& ns) const OVERRIDE;
     47   virtual bool IsInitializationComplete(PolicyDomain domain) const OVERRIDE;
     48   virtual void RefreshPolicies(const base::Closure& callback) OVERRIDE;
     49 
     50  private:
     51   typedef ObserverList<PolicyService::Observer, true> Observers;
     52   typedef std::map<PolicyDomain, Observers*> ObserverMap;
     53 
     54   // ConfigurationPolicyProvider::Observer overrides:
     55   virtual void OnUpdatePolicy(ConfigurationPolicyProvider* provider) OVERRIDE;
     56 
     57   // Posts a task to notify observers of |ns| that its policies have changed,
     58   // passing along the |previous| and the |current| policies.
     59   void NotifyNamespaceUpdated(const PolicyNamespace& ns,
     60                               const PolicyMap& previous,
     61                               const PolicyMap& current);
     62 
     63   // Combines the policies from all the providers, and notifies the observers
     64   // of namespaces whose policies have been modified.
     65   void MergeAndTriggerUpdates();
     66 
     67   // Checks if all providers are initialized, and notifies the observers
     68   // if the service just became initialized.
     69   void CheckInitializationComplete();
     70 
     71   // Invokes all the refresh callbacks if there are no more refreshes pending.
     72   void CheckRefreshComplete();
     73 
     74   // The providers passed in the constructor, in order of decreasing priority.
     75   Providers providers_;
     76 
     77   // Maps each policy namespace to its current policies.
     78   PolicyBundle policy_bundle_;
     79 
     80   // Maps each policy domain to its observer list.
     81   ObserverMap observers_;
     82 
     83   // True if all the providers are initialized for the indexed policy domain.
     84   bool initialization_complete_[POLICY_DOMAIN_SIZE];
     85 
     86   // Set of providers that have a pending update that was triggered by a
     87   // call to RefreshPolicies().
     88   std::set<ConfigurationPolicyProvider*> refresh_pending_;
     89 
     90   // List of callbacks to invoke once all providers refresh after a
     91   // RefreshPolicies() call.
     92   std::vector<base::Closure> refresh_callbacks_;
     93 
     94   // Used to create tasks to delay new policy updates while we may be already
     95   // processing previous policy updates.
     96   base::WeakPtrFactory<PolicyServiceImpl> update_task_ptr_factory_;
     97 
     98   DISALLOW_COPY_AND_ASSIGN(PolicyServiceImpl);
     99 };
    100 
    101 }  // namespace policy
    102 
    103 #endif  // COMPONENTS_POLICY_CORE_COMMON_POLICY_SERVICE_IMPL_H_
    104