From 04d428656ecd18b7c9d52eea3af57ba750ffd04b Mon Sep 17 00:00:00 2001
From: Sundar Sridharan <sundar.sridharan@gmail.com>
Date: Mon, 20 Feb 2017 14:44:35 -0800
Subject: [PATCH 1/2] Add Snapshot interface methods for moss child collections
 feature

---
 index/store/moss/lower.go | 28 ++++++++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/index/store/moss/lower.go b/index/store/moss/lower.go
index 6f1b1dcf..ed742026 100644
--- a/index/store/moss/lower.go
+++ b/index/store/moss/lower.go
@@ -105,8 +105,9 @@ type llSnapshot struct {
 	llStore  *llStore // Holds 1 refs on the llStore.
 	kvReader store.KVReader
 
-	m    sync.Mutex // Protects fields that follow.
-	refs int
+	m              sync.Mutex // Protects fields that follow.
+	refs           int
+	childSnapshots map[string]*llSnapshot
 }
 
 // llIterator represents a lower-level iterator, wrapping a bleve
@@ -316,6 +317,29 @@ func (llss *llSnapshot) decRef() {
 	llss.m.Unlock()
 }
 
+// ChildCollectionNames returns an array of child collection name strings.
+func (llss *llSnapshot) ChildCollectionNames() ([]string, error) {
+	var childCollections = make([]string, len(llss.childSnapshots))
+	idx := 0
+	for name, _ := range llss.childSnapshots {
+		childCollections[idx] = name
+		idx++
+	}
+	return childCollections, nil
+}
+
+// ChildCollectionSnapshot returns a Snapshot on a given child
+// collection by its name.
+func (llss *llSnapshot) ChildCollectionSnapshot(childCollectionName string) (
+	moss.Snapshot, error) {
+	childSnapshot, exists := llss.childSnapshots[childCollectionName]
+	if !exists {
+		return nil, nil
+	}
+	childSnapshot.addRef()
+	return childSnapshot, nil
+}
+
 func (llss *llSnapshot) Close() error {
 	llss.decRef()
 

From 74c7de0dcf01df1367d926d22fcef51f3333f3e5 Mon Sep 17 00:00:00 2001
From: Sundar Sridharan <sundar.sridharan@gmail.com>
Date: Tue, 21 Feb 2017 15:54:04 -0800
Subject: [PATCH 2/2] re-order childSnapshot declaration

---
 index/store/moss/lower.go | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/index/store/moss/lower.go b/index/store/moss/lower.go
index ed742026..2aff2aea 100644
--- a/index/store/moss/lower.go
+++ b/index/store/moss/lower.go
@@ -102,12 +102,12 @@ type llStore struct {
 // llSnapshot represents a lower-level snapshot, wrapping a bleve
 // store.KVReader, and implements the moss.Snapshot interface.
 type llSnapshot struct {
-	llStore  *llStore // Holds 1 refs on the llStore.
-	kvReader store.KVReader
-
-	m              sync.Mutex // Protects fields that follow.
-	refs           int
+	llStore        *llStore // Holds 1 refs on the llStore.
+	kvReader       store.KVReader
 	childSnapshots map[string]*llSnapshot
+
+	m    sync.Mutex // Protects fields that follow.
+	refs int
 }
 
 // llIterator represents a lower-level iterator, wrapping a bleve