1 files changed, 46 insertions, 0 deletions
diff --git a/lib/rubygems/source_info_cache_entry.rb b/lib/rubygems/source_info_cache_entry.rb
new file mode 100644
index 0000000000..02e03ca9db
--- /dev/null
+++ b/lib/rubygems/source_info_cache_entry.rb
@@ -0,0 +1,46 @@
+require 'rubygems'
+require 'rubygems/source_index'
+require 'rubygems/remote_fetcher'
+
+##
+# Entrys held by a SourceInfoCache.
+
+class Gem::SourceInfoCacheEntry
+
+  # The source index for this cache entry.
+  attr_reader :source_index
+
+  # The size of the of the source entry.  Used to determine if the
+  # source index has changed.
+  attr_reader :size
+
+  # Create a cache entry.
+  def initialize(si, size)
+    @source_index = si || Gem::SourceIndex.new({})
+    @size = size
+  end
+
+  def refresh(source_uri)
+    begin
+      marshal_uri = URI.join source_uri.to_s, "Marshal.#{Gem.marshal_version}"
+      remote_size = Gem::RemoteFetcher.fetcher.fetch_size marshal_uri
+    rescue Gem::RemoteSourceException
+      yaml_uri = URI.join source_uri.to_s, 'yaml'
+      remote_size = Gem::RemoteFetcher.fetcher.fetch_size yaml_uri
+    end
+
+    return false if @size == remote_size # TODO Use index_signature instead of size?
+    updated = @source_index.update source_uri
+    @size = remote_size
+
+    updated
+  end
+
+  def ==(other) # :nodoc:
+    self.class === other and
+    @size == other.size and
+    @source_index == other.source_index
+  end
+
+end
+