.

go/zodb/connection.go

@@ -118,7 +118,7 @@ type LiveCache struct {
 	objtab map[Oid]*weak.Ref // oid -> weak.Ref(IPersistent)
 
 	// hooks for application to influence live caching decisions.
-	cacheControl LiveCacheControl
+	control LiveCacheControl
 }
 
 // LiveCacheControl is the interface that allows applications to influence
@@ -182,6 +182,16 @@ func (cache *LiveCache) Get(oid Oid) IPersistent {
 	return obj
 }
 
+// SetControl installs c to handle cache decisions.
+//
+// Any previously installed cache control is uninstalled.
+// Passing nil sets the cache to have no control installed at all.
+//
+// It is not safe to call SetControl simultaneously to other cache operations.
+func (cache *LiveCache) SetControl(c LiveCacheControl) {
+	cache.control = c
+}
+
 // get is like Get, but used when we already know object class.
 //
 // Use-case: in ZODB references are (pyclass, oid), so new ghost is created

go/zodb/persistent.go

@@ -224,7 +224,7 @@ func (obj *Persistent) PDeactivate() {
 	// no constant load/unload on object access. XXX  -> MRU cache?
 	// NOTE wcfs manages its objects explicitly and does not need this.
 
-	if cc := obj.jar.cache.cacheControl; cc != nil {
+	if cc := obj.jar.cache.control; cc != nil {
 		if !cc.WantEvict(obj.instance) {
 			return
 		}

go/zodb/persistent_test.go

@@ -137,4 +137,5 @@ func TestPersistent(t *testing.T) {
 	// TODO activate again	- refcnt++
 	// TODO deactivate	- refcnt--
 	// TODO deactivate	- state dropped
+	// TODO invalidate	- must be on txn boundary; state dropped
 }