Brains: tasty but not needed right now, maybe useful to somebody else

[svn42.git] / go / brain / brain.go

diff --git a/go/brain/brain.go b/go/brain/brain.go
new file mode 100644 (file)
index 0000000..3bd8ce4
--- /dev/null
+++ b/go/brain/brain.go
@@ -0,0 +1,118 @@
+// (c) Bernhard Tittelbach, 2013
+
+package brain
+
+import "errors"
+
+type informationtuple struct {
+    name string
+    value interface{}
+}
+
+type informationretrievalpath struct {
+    name string
+    returnpath chan interface{}
+}
+
+type hippocampus map[string]interface{}
+
+type Brain struct {
+    storeTuple chan informationtuple
+    retrieveValue chan informationretrievalpath
+    shutdown chan bool
+}
+
+func New() *Brain {
+    b := new(Brain)
+    b.storeTuple = make(chan informationtuple)
+    b.retrieveValue = make(chan informationretrievalpath)
+    go b.runBrain()
+    return b
+}
+
+func (b *Brain) runBrain() {
+    var h hippocampus = make(hippocampus)
+    for {
+        select {
+            case newtuple := <- b.storeTuple:
+                h[newtuple.name] = newtuple.value
+
+            case retrievvalue := <- b.retrieveValue:
+                v, e := h[retrievvalue.name]
+                if e {
+                    retrievvalue.returnpath <- v
+                } else {
+                    retrievvalue.returnpath <- nil
+                }
+
+            case <- b.shutdown:
+                break
+        }
+    }
+}
+
+func (b *Brain) Shutdown() {
+    b.shutdown <- true
+}
+
+func (b *Brain) Oboite(name string, value interface{}) {
+    b.storeTuple <- informationtuple{name, value}
+}
+
+func (b *Brain) OmoiDashite(name string) (interface{}, error) {
+    rc := make(chan interface{})
+    b.retrieveValue <- informationretrievalpath{name, rc}
+    v := <- rc
+    if v == nil {
+        return v, errors.New("name not in brain")
+    }
+    return v, nil
+}
+
+func (b *Brain) OmoiDashiteBool(name string) (bool, error) {
+    v, e := b.OmoiDashite(name)
+    if e != nil {
+        return false, e
+    }
+    vc, ok := v.(bool)
+    if !ok {
+        return false, errors.New(name + " does not have type bool")
+    }
+    return vc, nil
+}
+
+func (b *Brain) OmoiDashiteInt(name string) (int, error) {
+    v, e := b.OmoiDashite(name)
+    if e != nil {
+        return 0, e
+    }
+    vc, ok := v.(int)
+    if !ok {
+        return 0, errors.New(name + " does not have type int")
+    }
+    return vc, nil
+}
+
+func (b *Brain) OmoiDashiteFloat(name string) (float64, error) {
+    v, e := b.OmoiDashite(name)
+    if e != nil {
+        return 0, e
+    }
+    vc, ok := v.(float64)
+    if !ok {
+        return 0, errors.New(name + " does not have type float64")
+    }
+    return vc, nil
+}
+
+func (b *Brain) OmoiDashiteString(name string) (string, error) {
+    v, e := b.OmoiDashite(name)
+    if e != nil {
+        return "", e
+    }
+    vc, ok := v.(string)
+    if !ok {
+        return "", errors.New(name + " does not have type string")
+    }
+    return vc, nil
+}
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