Change "gboolean connected" to "CamelServiceConnectionStatus status",

	* camel-service.c: Change "gboolean connected" to
	"CamelServiceConnectionStatus status", which can be disconnected,
	connecting, connected, or disconnecting.
	(camel_service_init, camel_service_finalize): create/destroy the
	connect_op_lock. Refer to service->status rather than
	service->connected.
	(camel_service_connect): When connecting, note the current
	operation (and create a new one if there's none registered) and
	mark the connection "connecting" until we succeed or fail.
	(camel_service_disconnect): Likewise in reverse.
	(camel_service_cancel_connect): New function to cancel a
	connection attempt.
	(cancel_connect): Default implementation: Call
	camel_operation_cancel on the connect_op.

	* camel-disco-store.c (disco_connect): Only call
	CamelRemoteStore's connect func if we're online.
	(disco_cancel_connect): Fall back to offline if a connection gets
	cancelled.
	(disco_get_folder_info): Kludge: call connect explicitly before
	deciding whether to do the online or offline version, so if the
	connect fails, we fall back correctly.

	* camel-session.c (camel_session_get_service_connected):
	s/svc->connected/svc->status/

	* camel-remote-store.c (camel_remote_store_finalise):
	Change service->connected check to service->status check.
	(remote_connect): Don't set service->connected here:
	camel_service_connect() itself does that.

	* camel-operation.c (camel_operation_registered): Deal with the
	possibility that there's no registered op.

svn path=/trunk/; revision=13191

8 files changed, 160 insertions, 29 deletions

diff --git a/camel/ChangeLog b/camel/ChangeLog
index b4c552572b..3c0abde3f2 100644
--- a/camel/ChangeLog
+++ b/camel/ChangeLog
@@ -1,3 +1,39 @@
+2001-09-27  Dan Winship  <danw@ximian.com>
+
+	* camel-service.c: Change "gboolean connected" to
+	"CamelServiceConnectionStatus status", which can be disconnected,
+	connecting, connected, or disconnecting.
+	(camel_service_init, camel_service_finalize): create/destroy the
+	connect_op_lock. Refer to service->status rather than
+	service->connected.
+	(camel_service_connect): When connecting, note the current
+	operation (and create a new one if there's none registered) and
+	mark the connection "connecting" until we succeed or fail.
+	(camel_service_disconnect): Likewise in reverse.
+	(camel_service_cancel_connect): New function to cancel a
+	connection attempt.
+	(cancel_connect): Default implementation: Call
+	camel_operation_cancel on the connect_op.
+
+	* camel-disco-store.c (disco_connect): Only call
+	CamelRemoteStore's connect func if we're online.
+	(disco_cancel_connect): Fall back to offline if a connection gets
+	cancelled.
+	(disco_get_folder_info): Kludge: call connect explicitly before
+	deciding whether to do the online or offline version, so if the
+	connect fails, we fall back correctly.
+
+	* camel-session.c (camel_session_get_service_connected):
+	s/svc->connected/svc->status/
+
+	* camel-remote-store.c (camel_remote_store_finalise):
+	Change service->connected check to service->status check.
+	(remote_connect): Don't set service->connected here:
+	camel_service_connect() itself does that.
+
+	* camel-operation.c (camel_operation_registered): Deal with the
+	possibility that there's no registered op.
+
 2001-09-26    <NotZed@Ximian.com>
 
 	* camel-filter-driver.c (camel_filter_driver_filter_message): If
diff --git a/camel/camel-disco-store.c b/camel/camel-disco-store.c
index 0cc5f4feea..145636f58d 100644
--- a/camel/camel-disco-store.c
+++ b/camel/camel-disco-store.c
@@ -39,6 +39,7 @@ static void disco_construct (CamelService *service, CamelSession *session,
 			     CamelProvider *provider, CamelURL *url,
 			     CamelException *ex);
 static gboolean disco_connect (CamelService *service, CamelException *ex);
+static void disco_cancel_connect (CamelService *service);
 static gboolean disco_disconnect (CamelService *service, gboolean clean, CamelException *ex);
 static CamelFolder *disco_get_folder (CamelStore *store, const char *name,
 				      guint32 flags, CamelException *ex);
@@ -68,6 +69,7 @@ camel_disco_store_class_init (CamelDiscoStoreClass *camel_disco_store_class)
 	camel_service_class->construct = disco_construct;
 	camel_service_class->connect = disco_connect;
 	camel_service_class->disconnect = disco_disconnect;
+	camel_service_class->cancel_connect = disco_cancel_connect;
 
 	camel_store_class->get_folder = disco_get_folder;
 	camel_store_class->get_folder_info = disco_get_folder_info;
@@ -111,11 +113,19 @@ static gboolean
 disco_connect (CamelService *service, CamelException *ex)
 {
 	CamelDiscoStore *store = CAMEL_DISCO_STORE (service);
+	CamelDiscoStoreStatus status;
+
+	status = camel_disco_store_status (store);
+	if (status != CAMEL_DISCO_STORE_OFFLINE) {
+		if (!CAMEL_SERVICE_CLASS (remote_store_class)->connect (service, ex)) {
+			status = camel_disco_store_status (store);
+			if (status != CAMEL_DISCO_STORE_OFFLINE)
+				return FALSE;
+			camel_exception_clear (ex);
+		}
+	}
 
-	if (!CAMEL_SERVICE_CLASS (remote_store_class)->connect (service, ex))
-		return FALSE;
-
-	switch (camel_disco_store_status (store)) {
+	switch (status) {
 	case CAMEL_DISCO_STORE_ONLINE:
 	case CAMEL_DISCO_STORE_RESYNCING:
 		if (!CDS_CLASS (service)->connect_online (service, ex))
@@ -142,6 +152,17 @@ disco_connect (CamelService *service, CamelException *ex)
 	return FALSE;
 }
 
+static void
+disco_cancel_connect (CamelService *service)
+{
+	CamelDiscoStore *store = CAMEL_DISCO_STORE (service);
+
+	/* Fall back */
+	store->status = CAMEL_DISCO_STORE_OFFLINE;
+
+	CAMEL_SERVICE_CLASS (remote_store_class)->cancel_connect (service);
+}
+
 static gboolean
 disco_disconnect (CamelService *service, gboolean clean, CamelException *ex)
 {
@@ -190,7 +211,17 @@ disco_get_folder_info (CamelStore *store, const char *top,
 		       guint32 flags, CamelException *ex)
 {
 	CamelDiscoStore *disco_store = CAMEL_DISCO_STORE (store);
-	
+
+	/* Do this first so if we get forced offline, we'll switch to
+	 * the correct branch below. (FIXME: This only works because
+	 * we know that get_folder_info is the first call that the
+	 * mailer makes on a store.)
+	 */
+	if (CAMEL_SERVICE (store)->status == CAMEL_SERVICE_DISCONNECTED) {
+		if (!camel_service_connect (CAMEL_SERVICE (store), ex))
+			return NULL;
+	}
+
 	switch (camel_disco_store_status (disco_store)) {
 	case CAMEL_DISCO_STORE_ONLINE:
 		return CDS_CLASS (store)->get_folder_info_online (store, top, flags, ex);
diff --git a/camel/camel-operation.c b/camel/camel-operation.c
index 42aa448820..95d8fa0f91 100644
--- a/camel/camel-operation.c
+++ b/camel/camel-operation.c
@@ -105,10 +105,13 @@ CamelOperation *camel_operation_registered(void)
 	CamelOperation *cc = NULL;
 
 	CAMEL_ACTIVE_LOCK();
-	if (operation_active != NULL)
+	if (operation_active != NULL) {
 		cc = g_hash_table_lookup(operation_active, (void *)pthread_self());
-	g_assert(cc->refcount > 0);
-	cc->refcount++;
+		if (cc) {
+			g_assert(cc->refcount > 0);
+			cc->refcount++;
+		}
+	}
 	CAMEL_ACTIVE_UNLOCK();
 
 	return cc;
diff --git a/camel/camel-private.h b/camel/camel-private.h
index 32cde53068..73a1b7bfc3 100644
--- a/camel/camel-private.h
+++ b/camel/camel-private.h
@@ -90,6 +90,7 @@ struct _CamelTransportPrivate {
 struct _CamelServicePrivate {
 #ifdef ENABLE_THREADS
 	EMutex *connect_lock;	/* for locking connection operations */
+	EMutex *connect_op_lock;/* for locking the connection_op */
 #endif
 };
 
diff --git a/camel/camel-remote-store.c b/camel/camel-remote-store.c
index 00f8dce4f4..e1818e47c0 100644
--- a/camel/camel-remote-store.c
+++ b/camel/camel-remote-store.c
@@ -129,7 +129,7 @@ camel_remote_store_finalise (CamelObject *object)
 	CamelRemoteStore *remote_store = CAMEL_REMOTE_STORE (object);
 	CamelService *service = CAMEL_SERVICE (object);
 	
-	if (service->connected) {
+	if (service->status == CAMEL_SERVICE_CONNECTED) {
 		CamelException ex;
 		
 		camel_exception_init (&ex);
@@ -277,9 +277,6 @@ remote_connect (CamelService *service, CamelException *ex)
 	store->ostream = tcp_stream;
 	store->istream = camel_stream_buffer_new (tcp_stream, CAMEL_STREAM_BUFFER_READ);
 	
-	/* Okay, good enough for us */
-	CAMEL_SERVICE (store)->connected = TRUE;
-	
 	/* Add a timeout so that we can hopefully prevent getting disconnected */
 	/* (Only if the implementation supports it) */
 	if (CRSC (store)->keepalive) {
diff --git a/camel/camel-service.c b/camel/camel-service.c
index 27d6a5bbee..cc254e1f2d 100644
--- a/camel/camel-service.c
+++ b/camel/camel-service.c
@@ -59,7 +59,7 @@ static void construct (CamelService *service, CamelSession *session,
 static gboolean service_connect(CamelService *service, CamelException *ex);
 static gboolean service_disconnect(CamelService *service, gboolean clean,
 				   CamelException *ex);
-/*static gboolean is_connected (CamelService *service);*/
+static void cancel_connect (CamelService *service);
 static GList *  query_auth_types (CamelService *service, CamelException *ex);
 static char *   get_name (CamelService *service, gboolean brief);
 static char *   get_path (CamelService *service);
@@ -74,6 +74,7 @@ camel_service_class_init (CamelServiceClass *camel_service_class)
 	camel_service_class->construct = construct;
 	camel_service_class->connect = service_connect;
 	camel_service_class->disconnect = service_disconnect;
+	camel_service_class->cancel_connect = cancel_connect;
 	camel_service_class->query_auth_types = query_auth_types;
 	camel_service_class->get_name = get_name;
 	camel_service_class->get_path = get_path;
@@ -87,6 +88,7 @@ camel_service_init (void *o, void *k)
 	service->priv = g_malloc0(sizeof(*service->priv));
 #ifdef ENABLE_THREADS
 	service->priv->connect_lock = e_mutex_new(E_MUTEX_REC);
+	service->priv->connect_op_lock = e_mutex_new(E_MUTEX_SIMPLE);
 #endif
 }
 
@@ -95,7 +97,7 @@ camel_service_finalize (CamelObject *object)
 {
 	CamelService *service = CAMEL_SERVICE (object);
 	
-	if (service->connected) {
+	if (service->status == CAMEL_SERVICE_CONNECTED) {
 		CamelException ex;
 		
 		camel_exception_init (&ex);
@@ -114,6 +116,7 @@ camel_service_finalize (CamelObject *object)
 	
 #ifdef ENABLE_THREADS
 	e_mutex_destroy (service->priv->connect_lock);
+	e_mutex_destroy (service->priv->connect_op_lock);
 #endif
 	g_free (service->priv);
 }
@@ -178,7 +181,7 @@ construct (CamelService *service, CamelSession *session,
 	service->session = session;
 	camel_object_ref (CAMEL_OBJECT (session));
 	
-	service->connected = FALSE;
+	service->status = CAMEL_SERVICE_DISCONNECTED;
 }
 
 /**
@@ -234,17 +237,30 @@ camel_service_connect (CamelService *service, CamelException *ex)
 	
 	CAMEL_SERVICE_LOCK (service, connect_lock);
 	
-	if (service->connected) {
-		/* But we're still connected, so no exception
-		 * and return true.
-		 */
-		g_warning ("camel_service_connect: trying to connect to an already connected service");
-		ret = TRUE;
-	} else if (CSERV_CLASS (service)->connect (service, ex)) {
-		service->connected = TRUE;
-		ret = TRUE;
+	if (service->status == CAMEL_SERVICE_CONNECTED) {
+		CAMEL_SERVICE_UNLOCK (service, connect_lock);
+		return TRUE;
 	}
-	
+
+	/* Register a separate operation for connecting, so that
+	 * the offline code can cancel it.
+	 */
+	CAMEL_SERVICE_LOCK (service, connect_op_lock);
+	service->connect_op = camel_operation_registered ();
+	if (!service->connect_op)
+		service->connect_op = camel_operation_new (NULL, NULL);
+	camel_operation_register (service->connect_op);
+	CAMEL_SERVICE_UNLOCK (service, connect_op_lock);
+
+	service->status = CAMEL_SERVICE_CONNECTING;
+	ret = CSERV_CLASS (service)->connect (service, ex);
+	service->status = ret ? CAMEL_SERVICE_CONNECTED : CAMEL_SERVICE_DISCONNECTED;
+
+	CAMEL_SERVICE_LOCK (service, connect_op_lock);
+	camel_operation_unref (service->connect_op);
+	service->connect_op = NULL;
+	CAMEL_SERVICE_UNLOCK (service, connect_op_lock);
+
 	CAMEL_SERVICE_UNLOCK (service, connect_lock);
 	
 	return ret;
@@ -282,9 +298,22 @@ camel_service_disconnect (CamelService *service, gboolean clean,
 	
 	CAMEL_SERVICE_LOCK (service, connect_lock);
 	
-	if (service->connected) {
+	if (service->status == CAMEL_SERVICE_CONNECTED) {
+		CAMEL_SERVICE_LOCK (service, connect_op_lock);
+		service->connect_op = camel_operation_registered ();
+		if (!service->connect_op)
+			service->connect_op = camel_operation_new (NULL, NULL);
+		camel_operation_register (service->connect_op);
+		CAMEL_SERVICE_UNLOCK (service, connect_op_lock);
+
+		service->status = CAMEL_SERVICE_DISCONNECTING;
 		res = CSERV_CLASS (service)->disconnect (service, clean, ex);
-		service->connected = FALSE;
+		service->status = CAMEL_SERVICE_DISCONNECTED;
+
+		CAMEL_SERVICE_LOCK (service, connect_op_lock);
+		camel_operation_unref (service->connect_op);
+		service->connect_op = NULL;
+		CAMEL_SERVICE_UNLOCK (service, connect_op_lock);
 	}
 	
 	CAMEL_SERVICE_UNLOCK (service, connect_lock);
@@ -292,6 +321,29 @@ camel_service_disconnect (CamelService *service, gboolean clean,
 	return res;
 }
 
+static void
+cancel_connect (CamelService *service)
+{
+	camel_operation_cancel (service->connect_op);
+}
+
+/**
+ * camel_service_cancel_connect:
+ * @service: a service
+ *
+ * If @service is currently attempting to connect to or disconnect
+ * from a server, this causes it to stop and fail. Otherwise it is a
+ * no-op.
+ **/
+void
+camel_service_cancel_connect (CamelService *service)
+{
+	CAMEL_SERVICE_LOCK (service, connect_op_lock);
+	if (service->connect_op)
+		CSERV_CLASS (service)->cancel_connect (service);
+	CAMEL_SERVICE_UNLOCK (service, connect_op_lock);
+}
+
 /**
  * camel_service_get_url:
  * @service: a service
diff --git a/camel/camel-service.h b/camel/camel-service.h
index 41ac53c4c7..a4399811cf 100644
--- a/camel/camel-service.h
+++ b/camel/camel-service.h
@@ -38,6 +38,7 @@ extern "C" {
 #include <camel/camel-object.h>
 #include <camel/camel-url.h>
 #include <camel/camel-provider.h>
+#include <camel/camel-operation.h>
 
 #define CAMEL_SERVICE_TYPE     (camel_service_get_type ())
 #define CAMEL_SERVICE(obj)     (CAMEL_CHECK_CAST((obj), CAMEL_SERVICE_TYPE, CamelService))
@@ -45,13 +46,21 @@ extern "C" {
 #define CAMEL_IS_SERVICE(o)    (CAMEL_CHECK_TYPE((o), CAMEL_SERVICE_TYPE))
 
 
+typedef enum {
+	CAMEL_SERVICE_DISCONNECTED,
+	CAMEL_SERVICE_CONNECTING,
+	CAMEL_SERVICE_CONNECTED,
+	CAMEL_SERVICE_DISCONNECTING
+} CamelServiceConnectionStatus;
+
 struct _CamelService {
 	CamelObject parent_object;
 	struct _CamelServicePrivate *priv;
 
 	CamelSession *session;
 	CamelProvider *provider;
-	gboolean connected;
+	CamelServiceConnectionStatus status;
+	CamelOperation *connect_op;
 	CamelURL *url;
 };
 
@@ -70,6 +79,7 @@ typedef struct {
 	gboolean  (*disconnect)        (CamelService *service,
 					gboolean clean,
 					CamelException *ex);
+	void      (*cancel_connect)    (CamelService *service);
 
 	GList *   (*query_auth_types)  (CamelService *service,
 					CamelException *ex);
@@ -102,6 +112,7 @@ gboolean            camel_service_connect            (CamelService *service,
 gboolean            camel_service_disconnect         (CamelService *service,
 						      gboolean clean,
 						      CamelException *ex);
+void                camel_service_cancel_connect     (CamelService *service);
 char *              camel_service_get_url            (CamelService *service);
 char *              camel_service_get_name           (CamelService *service,
 						      gboolean brief);
diff --git a/camel/camel-session.c b/camel/camel-session.c
index 7f7fbe7a59..facedb9400 100644
--- a/camel/camel-session.c
+++ b/camel/camel-session.c
@@ -480,7 +480,7 @@ camel_session_get_service_connected (CamelSession *session,
 	if (svc == NULL)
 		return NULL;
 
-	if (svc->connected == FALSE) {
+	if (svc->status != CAMEL_SERVICE_CONNECTED) {
 		if (camel_service_connect (svc, ex) == FALSE) {
 			camel_object_unref (CAMEL_OBJECT (svc));
 			return NULL;