Attachment 36465 Details for Bug 28743 – First version of a provider selection algorith.

First version of a provider selection algorith.

0001-Implementing-a-provider-selection-algorithm.patch (text/plain), 3.47 KB, created by Javier Fernández on 2010-06-24 10:08:51 UTC

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Creator: Javier Fernández

Created: 2010-06-24 10:08:51 UTC

Size: 3.47 KB

patch

obsolete

>From 69fe4a2fae4c59574c02987862ccc652a97f7fbe Mon Sep 17 00:00:00 2001
>From: Javier Fernandez <jfernandez@igalia.com>
>Date: Thu, 24 Jun 2010 17:06:06 +0000
>Subject: [PATCH] Implementing a provider selection algorithm.
>
>---
> src/client.c          |   55 ++++++++++++++++++++++++++++++++++++++----------
> src/master-provider.c |    6 ++--
> 2 files changed, 46 insertions(+), 15 deletions(-)
>
>diff --git a/src/client.c b/src/client.c
>index d4650e8..d820e28 100644
>--- a/src/client.c
>+++ b/src/client.c
>@@ -327,11 +327,18 @@ gc_master_client_get_best_provider (GcMasterClient    *client,
>                                     GList            **provider_list,
>                                     GcInterfaceFlags   iface)
> {
>+	GcMasterClientPrivate *priv = GET_PRIVATE (client);
>+	GcMasterProvider *best_provider = NULL;
>+	GcInterfaceAccuracy *min_accuracy = NULL;
> 	GList *l = *provider_list;
> 	/* TODO: should maybe choose a acquiring provider if better ones are are not available */
> 	
> 	g_debug ("client: choosing best provider");
> 	
>+	min_accuracy = g_new0(GcInterfaceAccuracy, 1);
>+	min_accuracy->interface = iface;
>+	min_accuracy->accuracy_level = priv->min_accuracy;
>+
> 	while (l) {
> 		GcMasterProvider *provider = l->data;
> 		
>@@ -348,20 +355,44 @@ gc_master_client_get_best_provider (GcMasterClient    *client,
> 			continue;
> 		}
> 		/* provider did not need to be started */
>-		
>-		/* TODO: currently returning even providers that are worse than priv->min_accuracy,
>-		 * if nothing else is available */
>-		if (gc_master_provider_get_status (provider) == GEOCLUE_STATUS_AVAILABLE) {
>-			/* unsubscribe from all providers worse than this */
>-			gc_master_client_unsubscribe_providers (client, l->next, iface);
>-			return provider;
>+
>+		/* Avoid evaluating twice the same provider. */
>+		if (best_provider == provider) {
>+			l = l->next;
>+			continue;
> 		}
>-		l = l->next;
>+
>+		/* Check if provider is available. */
>+		if (!gc_master_provider_get_status (provider) == GEOCLUE_STATUS_AVAILABLE) {
>+                        goto continue_searching;
>+		}
>+
>+		/* First provider evaluated, so its the best. */
>+		if (best_provider == NULL) {
>+			best_provider = provider;
>+			l = l->next;
>+			continue;
>+		}
>+
>+		/* Check if its the best provider. */
>+		if (0 < gc_master_provider_compare (provider, best_provider, min_accuracy)) {
>+			gc_master_provider_unsubscribe (best_provider, client, iface);
>+			best_provider = provider;
>+			l = l->next;
>+			continue;
>+		} else {
>+			goto continue_searching;
>+		}
>+
>+        continue_searching:
>+                gc_master_provider_unsubscribe (provider, client, iface);
>+                l = l->next;
> 	}
>-	
>-	/* no provider found */
>-	gc_master_client_unsubscribe_providers (client, *provider_list, iface);
>-	return NULL;
>+
>+	/* Free */
>+	g_free (min_accuracy);
>+
>+	return best_provider;
> }
> 
> static void
>diff --git a/src/master-provider.c b/src/master-provider.c
>index 790c043..6a70bf4 100644
>--- a/src/master-provider.c
>+++ b/src/master-provider.c
>@@ -1301,13 +1301,13 @@ gc_master_provider_compare (GcMasterProvider *a,
> 	 * providers meet the minimum accuracy requirement  */
> 	if ((level_b >= min_level) &&
> 	    (level_a >= min_level)) {
>-		diff = priv_a->required_resources - priv_b->required_resources;
>+		diff = priv_b->required_resources - priv_b->required_resources;
> 		if (diff != 0 ) {
> 			return diff;
> 		}
>-		return level_b - level_a;
>+		return level_a - level_b;
> 	}
> 	
> 	/* one or both do not meet req's, sort by accuracy */
>-	return level_b - level_a;
>+	return level_a - level_b;
> }
>-- 
>1.7.0.4
>

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Attachments on bug 28743: 36465 | 37799 | 38093

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