## TpSimpleObserver

TpSimpleObserver — a subclass of TpBaseClient implementing a simple Observer

## Synopsis

    #include <telepathy-glib/simple-observer.h>

                        TpSimpleObserver;
    void                (*TpSimpleObserverObserveChannelsImpl)
                                                            (TpSimpleObserver *self,
                                                             TpAccount *account,
                                                             TpConnection *connection,
                                                             GList *channels,
                                                             TpChannelDispatchOperation *dispatch_operation,
                                                             GList *requests,
                                                             TpObserveChannelsContext *context,
                                                             gpointer user_data);
    TpBaseClient *      tp_simple_observer_new              (TpDBusDaemon *dbus,
                                                             gboolean recover,
                                                             const gchar *name,
                                                             gboolean unique,
                                                             TpSimpleObserverObserveChannelsImpl callback,
                                                             gpointer user_data,
                                                             GDestroyNotify destroy);
    TpBaseClient *      tp_simple_observer_new_with_am      (TpAccountManager *account_manager,
                                                             gboolean recover,
                                                             const gchar *name,
                                                             gboolean unique,
                                                             TpSimpleObserverObserveChannelsImpl callback,
                                                             gpointer user_data,
                                                             GDestroyNotify destroy);

## Object Hierarchy

      GObject
       +----TpBaseClient
             +----TpSimpleObserver

## Implemented Interfaces

TpSimpleObserver implements TpSvcDBusProperties, TpSvcClient, TpSvcClientObserver, TpSvcClientApprover, TpSvcClientHandler and TpSvcClientInterfaceRequests.

## Properties

      "callback"                 gpointer              : Write / Construct Only
      "destroy"                  gpointer              : Write / Construct Only
      "recover"                  gboolean              : Write / Construct Only
      "user-data"                gpointer              : Write / Construct Only

## Description

This class makes it easier to write TpSvcClient implementing the TpSvcClientObserver interface.

A typical simple observer would look liks this:

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    static void
    my_observe_channels (TpSimpleObserver *self,
       TpAccount *account,
       TpConnection *connection,
       GList *channels,
       TpChannelDispatchOperation *dispatch_operation,
       GList *requests,
       TpObserveChannelsContext *context,
       gpointer user_data)
    {
     /* do something useful with the channels here */

     tp_observe_channels_context_accept (context);
    }

    client = tp_simple_observer_new (dbus, TRUE, "MyObserver", FALSE,
       my_observe_channels, user_data);

    tp_base_client_take_observer_filter (client, tp_asv_new (
         TP_PROP_CHANNEL_CHANNEL_TYPE, G_TYPE_STRING, TP_IFACE_CHANNEL_TYPE_TEXT,
         TP_PROP_CHANNEL_TARGET_HANDLE_TYPE, G_TYPE_UINT, TP_HANDLE_TYPE_CONTACT,
         NULL));

    tp_base_client_register (client, NULL);

See examples/client/media-observer.c for a complete example.

## Details

### TpSimpleObserver

    typedef struct _TpSimpleObserver TpSimpleObserver;

Data structure representing a simple Observer implementation.

Since 0.11.5

### TpSimpleObserverObserveChannelsImpl ()

    void                (*TpSimpleObserverObserveChannelsImpl)
                                                            (TpSimpleObserver *self,
                                                             TpAccount *account,
                                                             TpConnection *connection,
                                                             GList *channels,
                                                             TpChannelDispatchOperation *dispatch_operation,
                                                             GList *requests,
                                                             TpObserveChannelsContext *context,
                                                             gpointer user_data);

Signature of the implementation of the ObserveChannels method.

This function must call either `tp_observe_channels_context_accept()`, `tp_observe_channels_context_delay()` or `tp_observe_channels_context_fail()` on `context` before it returns.

`self` : | a TpSimpleObserver instance
`account` : | a TpAccount having `TP_ACCOUNT_FEATURE_CORE` prepared if possible
`connection` : | a TpConnection having `TP_CONNECTION_FEATURE_CORE` prepared if possible
`channels` : | a GList of TpChannel, all having `TP_CHANNEL_FEATURE_CORE` prepared if possible. [element-type TelepathyGLib.Channel]
`dispatch_operation` : | a TpChannelDispatchOperation or `NULL`; the dispatch_operation is not guaranteed to be prepared. [allow-none]
`requests` : | a GList of TpChannelRequest, all having their object-path defined but are not guaranteed to be prepared. [element-type TelepathyGLib.ChannelRequest]
`context` : | a TpObserveChannelsContext representing the context of this D-Bus call
`user_data` : | arbitrary user-supplied data passed to `tp_simple_observer_new()`

Since 0.11.5

### tp_simple_observer_new ()

    TpBaseClient *      tp_simple_observer_new              (TpDBusDaemon *dbus,
                                                             gboolean recover,
                                                             const gchar *name,
                                                             gboolean unique,
                                                             TpSimpleObserverObserveChannelsImpl callback,
                                                             gpointer user_data,
                                                             GDestroyNotify destroy);

Convenient function to create a new TpSimpleObserver instance.

If `dbus` is not the result of `tp_dbus_daemon_dup()`, you should call `tp_simple_observer_new_with_am()` instead, so that TpAccount, TpConnection and TpContact instances can be shared between modules.

`dbus` : | a TpDBusDaemon object, may not be `NULL`
`recover` : | the value of the Observer.Recover D-Bus property
`name` : | the name of the Observer (see "name": for details)
`unique` : | the value of the TpBaseClient:uniquify-name: property
`callback` : | the function called when ObserverChannels is called
`user_data` : | arbitrary user-supplied data passed to `callback`
`destroy` : | called with the user_data as argument, when the TpSimpleObserver is destroyed
Returns : | a new TpSimpleObserver. [type TelepathyGLib.SimpleObserver]

Since 0.11.5

### tp_simple_observer_new_with_am ()

    TpBaseClient *      tp_simple_observer_new_with_am      (TpAccountManager *account_manager,
                                                             gboolean recover,
                                                             const gchar *name,
                                                             gboolean unique,
                                                             TpSimpleObserverObserveChannelsImpl callback,
                                                             gpointer user_data,
                                                             GDestroyNotify destroy);

Convenient function to create a new TpSimpleObserver instance with a specified TpAccountManager.

It is not necessary to prepare any features on `account_manager` before calling this function.

`account_manager` : | an account manager, which may not be `NULL`
`recover` : | the value of the Observer.Recover D-Bus property
`name` : | the name of the Observer (see "name": for details)
`unique` : | the value of the TpBaseClient:uniquify-name: property
`callback` : | the function called when ObserverChannels is called
`user_data` : | arbitrary user-supplied data passed to `callback`
`destroy` : | called with the user_data as argument, when the TpSimpleObserver is destroyed
Returns : | a new TpSimpleObserver. [type TelepathyGLib.SimpleObserver]

Since 0.11.14

## Property Details

### The `"callback"` property

      "callback"                 gpointer              : Write / Construct Only

The TpSimpleObserverObserveChannelsImpl callback implementing the ObserverChannels D-Bus method.

This property can't be `NULL`.

Since 0.11.5

### The `"destroy"` property

      "destroy"                  gpointer              : Write / Construct Only

The GDestroyNotify function called to free the user-data pointer when the TpSimpleObserver is destroyed.

Since 0.11.5

### The `"recover"` property

      "recover"                  gboolean              : Write / Construct Only

The value of the Observer.Recover D-Bus property.

Default value: FALSE

Since 0.11.5

### The `"user-data"` property

      "user-data"                gpointer              : Write / Construct Only

The user-data pointer passed to the callback implementing the ObserverChannels D-Bus method.

Since 0.11.5