Added channel caching by host string

1 files changed, 12 insertions, 2 deletions

diff --git a/src/objective-c/GRPCClient/private/GRPCChannel.m b/src/objective-c/GRPCClient/private/GRPCChannel.m
index 8b7055815d..e1aebdfe57 100644
--- a/src/objective-c/GRPCClient/private/GRPCChannel.m
+++ b/src/objective-c/GRPCClient/private/GRPCChannel.m
@@ -40,9 +40,19 @@
 
 @implementation GRPCChannel
 
+// TODO(mlumish): Investigate whether a cache with strong links is a good idea
+static NSMutableDictionary *channelCache;
+
 + (instancetype)channelToHost:(NSString *)host {
-  // TODO(jcanizales): Reuse channels.
-  return [[self alloc] initWithHost:host];
+  if (channelCache == nil) {
+    channelCache = [NSMutableDictionary dictionary];
+  }
+  GRPCChannel *channel = channelCache[host];
+  if (channel == nil) {
+    channel = [[self alloc] initWithHost:host];
+    channelCache[host] = channel;
+  }
+  return channel;
 }
 
 - (instancetype)init {