components/policy/core/common/policy_service_impl.h

   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 "base/threading/thread_checker.h"
  18 #include "components/policy/core/common/configuration_policy_provider.h"
  19 #include "components/policy/core/common/policy_bundle.h"
  20 #include "components/policy/core/common/policy_service.h"
  21 #include "components/policy/policy_export.h"
  22
  23 namespace policy {
  24
  25 class PolicyMap;
  26
  27 class POLICY_EXPORT PolicyServiceImpl
  28     : public PolicyService,
  29       public ConfigurationPolicyProvider::Observer {
  30  public:
  31   typedef std::vector<ConfigurationPolicyProvider*> Providers;
  32
  33   // The PolicyServiceImpl will merge policies from |providers|. |providers|
  34   // must be sorted in decreasing order of priority; the first provider will
  35   // have the highest priority. The PolicyServiceImpl does not take ownership of
  36   // the providers, and they must outlive the PolicyServiceImpl.
  37   explicit PolicyServiceImpl(const Providers& providers);
  38
  39   ~PolicyServiceImpl() override;
  40
  41   // PolicyService overrides:
  42   void AddObserver(PolicyDomain domain,
  43                    PolicyService::Observer* observer) override;
  44   void RemoveObserver(PolicyDomain domain,
  45                       PolicyService::Observer* observer) override;
  46   const PolicyMap& GetPolicies(const PolicyNamespace& ns) const override;
  47   bool IsInitializationComplete(PolicyDomain domain) const override;
  48   void RefreshPolicies(const base::Closure& callback) override;
  49
  50  private:
  51   typedef base::ObserverList<PolicyService::Observer, true> Observers;
  52   typedef std::map<PolicyDomain, Observers*> ObserverMap;
  53
  54   // ConfigurationPolicyProvider::Observer overrides:
  55   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 verify thread-safe usage.
  95   base::ThreadChecker thread_checker_;
  96
  97   // Used to create tasks to delay new policy updates while we may be already
  98   // processing previous policy updates.
  99   base::WeakPtrFactory<PolicyServiceImpl> update_task_ptr_factory_;
 100
 101   DISALLOW_COPY_AND_ASSIGN(PolicyServiceImpl);
 102 };
 103
 104 }  // namespace policy
 105
 106 #endif  // COMPONENTS_POLICY_CORE_COMMON_POLICY_SERVICE_IMPL_H_