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// 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 CHROME_BROWSER_EXTENSIONS_EXTENSION_ACTIVITY_LOG_H_
#define CHROME_BROWSER_EXTENSIONS_EXTENSION_ACTIVITY_LOG_H_
#include <map>
#include <string>
#include "base/memory/singleton.h"
#include "base/observer_list_threadsafe.h"
#include "base/synchronization/lock.h"
namespace extensions {
class Extension;
}
// A utility for tracing interesting activity for each extension.
class ExtensionActivityLog {
public:
enum Activity {
ACTIVITY_EXTENSION_API_CALL, // Extension API invocation is called.
ACTIVITY_EXTENSION_API_BLOCK // Extension API invocation is blocked.
};
// Observers can listen for activity events.
class Observer {
public:
virtual void OnExtensionActivity(const extensions::Extension* extension,
Activity activity,
const std::string& msg) = 0;
};
~ExtensionActivityLog();
static ExtensionActivityLog* GetInstance();
// Add/remove observer.
void AddObserver(const extensions::Extension* extension, Observer* observer);
void RemoveObserver(const extensions::Extension* extension,
Observer* observer);
// Check for the existence observer list by extension_id.
bool HasObservers(const extensions::Extension* extension) const;
// Log |activity| for |extension|.
void Log(const extensions::Extension* extension,
Activity activity,
const std::string& msg) const;
private:
ExtensionActivityLog();
friend struct DefaultSingletonTraits<ExtensionActivityLog>;
static const char* ActivityToString(Activity activity);
// A lock used to synchronize access to member variables.
mutable base::Lock lock_;
// Whether to log activity to stdout. This is set by checking the
// enable-extension-activity-logging switch.
bool log_activity_to_stdout_;
typedef ObserverListThreadSafe<Observer> ObserverList;
typedef std::map<const extensions::Extension*, scoped_refptr<ObserverList> >
ObserverMap;
// A map of extensions to activity observers for that extension.
ObserverMap observers_;
DISALLOW_COPY_AND_ASSIGN(ExtensionActivityLog);
};
#endif // CHROME_BROWSER_EXTENSIONS_EXTENSION_ACTIVITY_LOG_H_
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