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      1 // Copyright (c) 2011 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 CHROME_BROWSER_POLICY_ASYNCHRONOUS_POLICY_PROVIDER_H_
      6 #define CHROME_BROWSER_POLICY_ASYNCHRONOUS_POLICY_PROVIDER_H_
      7 #pragma once
      8 
      9 #include "base/memory/ref_counted.h"
     10 #include "base/memory/weak_ptr.h"
     11 #include "base/threading/non_thread_safe.h"
     12 #include "chrome/browser/policy/configuration_policy_provider.h"
     13 
     14 namespace policy {
     15 
     16 class AsynchronousPolicyLoader;
     17 
     18 // Policy provider that loads policy asynchronously. Providers should subclass
     19 // from this class if loading the policy requires disk access or must for some
     20 // other reason be performed on the file thread. The actual logic for loading
     21 // policy is handled by a delegate passed at construction time.
     22 class AsynchronousPolicyProvider
     23     : public ConfigurationPolicyProvider,
     24       public base::NonThreadSafe {
     25  public:
     26   // Must be implemented by subclasses of the asynchronous policy provider to
     27   // provide the implementation details of how policy is loaded.
     28   class Delegate {
     29    public:
     30     virtual ~Delegate() {}
     31 
     32     virtual DictionaryValue* Load() = 0;
     33   };
     34 
     35   // Assumes ownership of |loader|.
     36   AsynchronousPolicyProvider(
     37       const PolicyDefinitionList* policy_list,
     38       scoped_refptr<AsynchronousPolicyLoader> loader);
     39   virtual ~AsynchronousPolicyProvider();
     40 
     41   // ConfigurationPolicyProvider implementation.
     42   virtual bool Provide(ConfigurationPolicyStoreInterface* store);
     43 
     44   // For tests to trigger reloads.
     45   scoped_refptr<AsynchronousPolicyLoader> loader();
     46 
     47  protected:
     48   // The loader object used internally.
     49   scoped_refptr<AsynchronousPolicyLoader> loader_;
     50 
     51  private:
     52   // ConfigurationPolicyProvider overrides:
     53   virtual void AddObserver(ConfigurationPolicyProvider::Observer* observer);
     54   virtual void RemoveObserver(ConfigurationPolicyProvider::Observer* observer);
     55 
     56   DISALLOW_COPY_AND_ASSIGN(AsynchronousPolicyProvider);
     57 };
     58 
     59 }  // namespace policy
     60 
     61 #endif  // CHROME_BROWSER_POLICY_ASYNCHRONOUS_POLICY_PROVIDER_H_
     62