nserver: protocol.h: Update sssample.

* nserver/src/protocol.c (sssample):  Return mean on success.
* nserver/src/protocol.h (sssample): Change return data type to
double.
* nserver/tests/protocol_tests.c (test_sssample): Update test.

3 files changed, 21 insertions, 18 deletions

diff --git a/nserver/src/protocol.c b/nserver/src/protocol.c
index aee10c6..1a388c3 100644
--- a/nserver/src/protocol.c
+++ b/nserver/src/protocol.c
@@ -64,7 +64,7 @@ int ssdelete(char *key)
     return -1;
 }
 
-int sssample(char *key, double s)
+double sssample(char *key, double s)
 {
     check(hash != NULL, "hash not initialized");
 
@@ -79,7 +79,10 @@ int sssample(char *key, double s)
     // 3. sample!
     Stats_sample(st, s);
 
-    return 0;
+    // 4. get mean.
+    double m = Stats_mean(st);
+
+    return m;
  error:
     return -1;
 }
diff --git a/nserver/src/protocol.h b/nserver/src/protocol.h
index 921640c..20fb24a 100644
--- a/nserver/src/protocol.h
+++ b/nserver/src/protocol.h
@@ -10,7 +10,7 @@
 
 int sscreate(char *key);
 int ssdelete(char *key);
-int sssample(char *key, double s);
+double sssample(char *key, double s);
 double ssmean(char *key);
 char *ssdump(char *key);
 char *sslist();
diff --git a/nserver/tests/protocol_tests.c b/nserver/tests/protocol_tests.c
index 8309686..146fc08 100644
--- a/nserver/tests/protocol_tests.c
+++ b/nserver/tests/protocol_tests.c
@@ -16,28 +16,28 @@ char *test_sscreate()
 
 char *test_sssample()
 {
-    int rc = 0;
+    double mean = 0;
 
-    rc = sssample("crimson", 3);
-    mu_assert(rc == 0, "sssample failed 0");
+    mean = sssample("crimson", 3);
+    mu_assert(mean == 3.0, "sssample failed 0");
 
-    rc = sssample("crimson", 9);
-    mu_assert(rc == 0, "sssample failed 1");
+    mean = sssample("crimson", 9);
+    mu_assert(mean == 6.0, "sssample failed 1");
 
-    rc = sssample("crimson", 12);
-    mu_assert(rc == 0, "sssample failed 2");
+    mean = sssample("crimson", 12);
+    mu_assert(mean == 8.0, "sssample failed 2");
 
-    rc = sssample("/vermilion", 20);
-    mu_assert(rc == 0, "sssample failed 3");
+    mean = sssample("/vermilion", 20);
+    mu_assert(mean == 20.0, "sssample failed 3");
 
-    rc = sssample("/vermilion", 27);
-    mu_assert(rc == 0, "sssample failed 4");
+    mean = sssample("/vermilion", 27);
+    mu_assert(mean == 23.5, "sssample failed 4");
 
-    rc = sssample("/vermilion", 4);
-    mu_assert(rc == 0, "sssample failed 5");
+    mean = sssample("/vermilion", 4);
+    mu_assert(mean == 17.0, "sssample failed 5");
 
-    rc = sssample("/ruby", 48);
-    mu_assert(rc == -1, "sssample failed 6");
+    mean = sssample("/ruby", 48);
+    mu_assert(mean == -1, "sssample failed 6");
 
     return NULL;
 }