From a1a3bd430bb03776ab5e422efa2b89f96b07380f Mon Sep 17 00:00:00 2001
From: Archivist <qnekomata@gmail.com>
Date: Sun, 12 Aug 2018 13:31:12 +0200
Subject: [PATCH] Added an history feature

---
 README.md                       |  4 ++--
 shard.yml                       |  2 +-
 src/crystal-scatter/metaring.cr | 25 +++++++++++++++++++++++++
 src/crystal-scatter/version.cr  |  2 +-
 4 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index a65e178..1b42596 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # crystal-scatter
 
-
+Release candidate for v0.1 "John Scott"
 
 ## Installation
 
@@ -10,7 +10,7 @@ Add this to your application's `shard.yml`:
 dependencies:
   crystal-scatter:
     git: https://git.nekoit.xyz/Archivist/crystal-scatter
-    version: ~> 0.1.0-rc1
+    version: ~> 0.1.0-rc2
 ```
 
 ## Usage
diff --git a/shard.yml b/shard.yml
index afa8c91..aab8963 100644
--- a/shard.yml
+++ b/shard.yml
@@ -1,5 +1,5 @@
 name: crystal-scatter
-version: 0.1.0-rc1
+version: 0.1.0-rc2
 
 authors:
   - Ludovic 'Archivist' Lagouardette <lagouardette.ludovic@gmail.com>
diff --git a/src/crystal-scatter/metaring.cr b/src/crystal-scatter/metaring.cr
index 18898ae..196f542 100644
--- a/src/crystal-scatter/metaring.cr
+++ b/src/crystal-scatter/metaring.cr
@@ -91,6 +91,31 @@ module Crystal::Scatter
             end
             return slices
         end
+
+        def get_slices_for(data : String, n_last = 1 : Int32)
+            n_rings = Array(Ring).new
+            @lock.synchronize do
+                t = @rings.size-n_last
+                n_rings = @rings.skip( t > 0 ? t : 1 ) 
+            end
+            h = hash_impl data
+            space=UInt64::MAX/@shards
+            targets = Array(UInt64).new
+            (1..@shards).each do
+                targets << h
+                h+=space
+            end
+
+            ret = Array(Array(Slice)).new
+            n_rings.each do |ring|
+                slices = Array(Slice).new
+                targets.each do |h|
+                    slices << get_slice_from_hash(ring, h)
+                end
+                ret << slices
+            end
+            return ret
+        end
     end
 
 end
\ No newline at end of file
diff --git a/src/crystal-scatter/version.cr b/src/crystal-scatter/version.cr
index ff11827..34bceb9 100644
--- a/src/crystal-scatter/version.cr
+++ b/src/crystal-scatter/version.cr
@@ -1,3 +1,3 @@
 module Crystal::Scatter
-  VERSION = "0.1.0-rc1"
+  VERSION = "0.1.0-rc2"
 end