commit c458deea83b4356f07194691e301037d8e831d46
author Matt Spinler <spinler@us.ibm.com> Mon Feb 19 13:09:10 2018 -0600
committer Matt Spinler <spinler@us.ibm.com> Fri Feb 23 13:51:02 2018 -0600
tree a01904097309523a576612c33cdc2c3a17a69095
parent 8bbf9d2cc5a502fa0df0e70bd4232208a1ab6c01

Add oneshot support to count conditions

When a count condition is a oneshot, it will only
trigger the callback the first time the condition
is true.  The condition needs to evaluate to false
at least once to rearm the callback.

A use case for this would be when a group of properties
is being watched for a subset of them hit a certain value.
Even though every properties changed signal for every property
in the group would check the condition, only the first time
the condition is true would the callback be issued.

This behavior is specified with a 'oneshot: true' entry in
the YAML.  If not present, it defaults to false which is
the original behavior.

Tested: Verify this does indeed do what is advertised by
        modifying condition rules to consistently pass
        and checking behavior.

Change-Id: Ie185621e86c605234bf329a5f38317267dbb6fb6
Signed-off-by: Matt Spinler <spinler@us.ibm.com>

src/example/example.yaml

diff --git a/src/example/example.yaml b/src/example/example.yaml
index 226f491..bfb1c62 100644
--- a/src/example/example.yaml
+++ b/src/example/example.yaml
@@ -181,7 +181,12 @@
 
     For example, a callback that requires at least three temperature sensors
     in the group to be higher than 115 degrees might use a count condition
-    with an op of >, a count op of >=, a bound of 115, and a countbound of 3.'
+    with an op of >, a count op of >=, a bound of 115, and a countbound of 3.
+
+    The optional oneshot parameter defaults to false.  If it is specified and
+    set to true, then the callback will only be called once for as long as the
+    condition is repeatedly passing.  The condition needs to fail at least
+    once to rearm the callback.'
 
   class: condition
   condition: count
@@ -192,6 +197,7 @@
   countbound: 3
   op: '>='
   bound: 115
+  oneshot: true
 
 - name: example deferred condition
   description: >

src/example/test.yaml

diff --git a/src/example/test.yaml b/src/example/test.yaml
index fb37efe..6632891 100644
--- a/src/example/test.yaml
+++ b/src/example/test.yaml
@@ -317,6 +317,7 @@
   countbound: 3
   op: '<'
   bound: 115
+  oneshot: true
 
 - name: test count lte
   class: condition
@@ -329,6 +330,7 @@
   countbound: 3
   op: '<='
   bound: 115
+  oneshot: false
 
 - name: test count gt
   class: condition