Merge pull request #1593 from murgatroid99/objective_c_channel_cache

Added channel caching by the user-provided 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..36f4c0aa5e 100644
--- a/src/objective-c/GRPCClient/private/GRPCChannel.m
+++ b/src/objective-c/GRPCClient/private/GRPCChannel.m
@@ -41,8 +41,18 @@
 @implementation GRPCChannel
 
 + (instancetype)channelToHost:(NSString *)host {
-  // TODO(jcanizales): Reuse channels.
-  return [[self alloc] initWithHost:host];
+  // TODO(mlumish): Investigate whether a cache with strong links is a good idea
+  static NSMutableDictionary *channelCache;
+  static dispatch_once_t cacheInitialization;
+  dispatch_once(&cacheInitialization, ^{
+    channelCache = [NSMutableDictionary dictionary];
+  });
+  GRPCChannel *channel = channelCache[host];
+  if (!channel) {
+    channel = [[self alloc] initWithHost:host];
+    channelCache[host] = channel;
+  }
+  return channel;
 }
 
 - (instancetype)init {