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28 #ifndef TALK_BASE_DBUS_H_
29 #define TALK_BASE_DBUS_H_
33 #include <dbus/dbus.h>
38 #include "talk/base/libdbusglibsymboltable.h"
39 #include "talk/base/messagehandler.h"
40 #include "talk/base/thread.h"
44 #define DBUS_TYPE "type"
45 #define DBUS_SIGNAL "signal"
46 #define DBUS_PATH "path"
47 #define DBUS_INTERFACE "interface"
48 #define DBUS_MEMBER "member"
51 #define CROS_PM_PATH "/"
52 #define CROS_PM_INTERFACE "org.chromium.PowerManager"
53 #define CROS_SIG_POWERCHANGED "PowerStateChanged"
54 #define CROS_VALUE_SLEEP "mem"
55 #define CROS_VALUE_RESUME "on"
57 #define UP_PATH "/org/freedesktop/UPower"
58 #define UP_INTERFACE "org.freedesktop.UPower"
59 #define UP_SIG_SLEEPING "Sleeping"
60 #define UP_SIG_RESUMING "Resuming"
63 // Wraps a DBus messages.
64 class DBusSigMessageData : public TypedMessageData<DBusMessage *> {
66 explicit DBusSigMessageData(DBusMessage *message);
67 ~DBusSigMessageData();
70 // DBusSigFilter is an abstract class that defines the interface of DBus
72 // The subclasses implement ProcessSignal() for various purposes.
73 // When a DBus signal comes, a DSM_SIGNAL message is posted to the caller thread
74 // which will then invokes ProcessSignal().
75 class DBusSigFilter : protected MessageHandler {
77 enum DBusSigMessage { DSM_SIGNAL };
79 // This filter string should ususally come from BuildFilterString()
80 explicit DBusSigFilter(const std::string &filter)
81 : caller_thread_(Thread::Current()), filter_(filter) {
84 // Builds a DBus monitor filter string from given DBus path, interface, and
86 // See http://dbus.freedesktop.org/doc/api/html/group__DBusConnection.html
87 static std::string BuildFilterString(const std::string &path,
88 const std::string &interface,
89 const std::string &member);
91 // Handles callback on DBus messages by DBus system.
92 static DBusHandlerResult DBusCallback(DBusConnection *dbus_conn,
96 // Handles callback on DBus messages to each DBusSigFilter instance.
97 DBusHandlerResult Callback(DBusMessage *message);
99 // From MessageHandler.
100 virtual void OnMessage(Message *message);
102 // Returns the DBus monitor filter string.
103 const std::string &filter() const { return filter_; }
107 virtual void ProcessSignal(DBusMessage *message) = 0;
109 Thread *caller_thread_;
110 const std::string filter_;
113 // DBusMonitor is a class for DBus signal monitoring.
115 // The caller-thread calls AddFilter() first to add the signals that it wants to
116 // monitor and then calls StartMonitoring() to start the monitoring.
117 // This will create a worker-thread which listens on DBus connection and sends
118 // DBus signals back through the callback.
119 // The worker-thread will be running forever until either StopMonitoring() is
120 // called from the caller-thread or the worker-thread hit some error.
122 // Programming model:
123 // 1. Caller-thread: Creates an object of DBusMonitor.
124 // 2. Caller-thread: Calls DBusMonitor::AddFilter() one or several times.
125 // 3. Caller-thread: StartMonitoring().
127 // 4. Worker-thread: DBus signal recieved. Post a message to caller-thread.
128 // 5. Caller-thread: DBusFilterBase::ProcessSignal() is invoked.
130 // 6. Caller-thread: StopMonitoring().
133 // AddFilter(), StartMonitoring(), and StopMonitoring() methods are called by
134 // a single thread. Hence, there is no need to make them thread safe.
137 // Status of DBus monitoring.
138 enum DBusMonitorStatus {
139 DMS_NOT_INITIALIZED, // Not initialized.
140 DMS_INITIALIZING, // Initializing the monitoring thread.
141 DMS_RUNNING, // Monitoring.
142 DMS_STOPPED, // Not monitoring. Stopped normally.
143 DMS_FAILED, // Not monitoring. Failed.
146 // Returns the DBus-Glib symbol table.
147 // We should only use this function to access DBus-Glib symbols.
148 static LibDBusGlibSymbolTable *GetDBusGlibSymbolTable();
150 // Creates an instance of DBusMonitor.
151 static DBusMonitor *Create(DBusBusType type);
154 // Adds a filter to DBusMonitor.
155 bool AddFilter(DBusSigFilter *filter);
157 // Starts DBus message monitoring.
158 bool StartMonitoring();
160 // Stops DBus message monitoring.
161 bool StopMonitoring();
163 // Gets the status of DBus monitoring.
164 DBusMonitorStatus GetStatus();
167 // Forward declaration. Defined in the .cc file.
168 class DBusMonitoringThread;
170 explicit DBusMonitor(DBusBusType type);
172 // Updates status_ when monitoring status has changed.
173 void OnMonitoringStatusChanged(DBusMonitorStatus status);
176 DBusMonitorStatus status_;
177 DBusMonitoringThread *monitoring_thread_;
178 std::vector<DBusSigFilter *> filter_list_;
181 } // namespace talk_base
183 #endif // HAVE_DBUS_GLIB
185 #endif // TALK_BASE_DBUS_H_