1 files changed, 23 insertions, 1 deletions
diff --git a/shard/lib/manager.ex b/shard/lib/manager.ex
index 57f2371..617378c 100644
--- a/shard/lib/manager.ex
+++ b/shard/lib/manager.ex
@@ -1,5 +1,17 @@
 defprotocol Shard.Manifest do
-  @doc "Start the corresponding Shard process"
+  @moduledoc"""
+  A shard manifest is a data structure that uniquely defines the identity of the shard.
+
+  The hash of the manifest is the unique identifier of that shard on the network.
+  
+  The Manifest protocol is a protocol implemented by the manifest structs for the
+  different shard types. It contains an operation start() that is able to launch the
+  correct process for this shard and connect to other peers that use it.
+  """
+
+  @doc"""
+  Start the corresponding Shard process
+  """
   def start(manifest)
 end
 
@@ -261,6 +273,16 @@ defmodule Shard.Manager do
   end
 
   @doc"""
+  Returns the pid for a shard if it exists
+  """
+  def find_proc(shard_id) do
+    case :dets.lookup(@shard_db, shard_id) do
+      [{^shard_id, _, pid}] -> pid
+      _ -> nil
+    end
+  end
+
+  @doc"""
   Register a process as the handler for shard packets for a given path.
   """
   def dispatch_to(shard_id, path, pid) do