Implemented a basic block caching system.

- for block {block_id}, to have a cache with 3600 seconds of expiration,
    declare in the cms.ini
     [blocks]
     {block_id}.expiration=3600

Added support for size in feed aggregation with new field "size"

src/hooks/cms_hook_core_manager.e

@@ -141,6 +141,8 @@ feature -- Hook: block
 		local
 			bl: READABLE_STRING_8
 			bl_optional: BOOLEAN
+			l_ok: BOOLEAN
+			l_block_cache: detachable TUPLE [block: CMS_CACHE_BLOCK; region: READABLE_STRING_8; expired: BOOLEAN]
 		do
 			if attached subscribers ({CMS_HOOK_BLOCK}) as lst then
 				across
@@ -150,15 +152,24 @@ feature -- Hook: block
 						across
 							h.block_list as blst
 						loop
+							l_ok := False
 							bl := blst.item
 							bl_optional := bl.count > 0 and bl[1] = '?'
 							if bl_optional then
 								bl := bl.substring (2, bl.count)
 								if a_response.is_block_included (bl, False) then
-									h.get_block_view (bl, a_response)
+									l_ok := True
 								end
 							else
-								h.get_block_view (bl, a_response)
+								l_ok := True
+							end
+							if l_ok then
+								l_block_cache := a_response.block_cache (bl)
+								if l_block_cache /= Void and then not l_block_cache.expired then
+									a_response.add_block (l_block_cache.block, l_block_cache.region)
+								else
+									h.get_block_view (bl, a_response)
+								end
 							end
 						end
 					end

src/kernel/content/cms_cache_block.e

@@ -0,0 +1,99 @@
+note
+	description: "[
+			CMS_BLOCK implemented with a `cache'
+			as caching solution.
+		]"
+	date: "$Date: 2014-11-18 10:13:13 +0100 (mar., 18 nov. 2014) $"
+	revision: "$Revision: 96110 $"
+
+class
+	CMS_CACHE_BLOCK
+
+inherit
+	CMS_BLOCK
+
+create
+	make
+
+feature {NONE} -- Initialization
+
+	make (a_name: like name; a_cache: like cache)
+		require
+			a_name_not_blank: not a_name.is_whitespace
+		do
+			is_enabled := True
+			name := a_name
+			cache := a_cache
+			set_is_raw (True)
+		end
+
+feature -- Access
+
+	name: READABLE_STRING_8
+			-- <Precursor>
+
+	title: detachable READABLE_STRING_32
+			-- <Precursor>
+
+	cache: CMS_CACHE [READABLE_STRING_8]
+			-- Cache content.
+
+feature -- Status report
+
+	is_empty: BOOLEAN
+			-- Is current block empty?
+		do
+			Result := is_raw and not cache.exists
+		end
+
+	is_raw: BOOLEAN assign set_is_raw
+			-- Is raw?
+			-- If True, do not get wrapped it with block specific div	
+
+feature -- Element change
+
+	set_is_raw (b: BOOLEAN)
+		do
+			is_raw := b
+		end
+
+	set_name (n: like name)
+			-- Set `name' to `n'.
+		require
+			not n.is_whitespace
+		do
+			name := n
+		end
+
+	set_title (a_title: like title)
+			-- Set `title' to `a_title'.
+		do
+			title := a_title
+		end
+
+feature -- Conversion
+
+	to_html (a_theme: CMS_THEME): STRING_8
+		do
+			debug
+				print ("REUSE CACHE for [" + name + "]!!!%N")
+			end
+				-- Why in this particular case theme is not used to generate the content?
+			if attached cache.item as l_content then
+				Result := l_content
+			else
+				Result := ""
+				check exists: False end
+			end
+		end
+note
+	copyright: "2011-2015, Jocelyn Fiat, Javier Velilla, Eiffel Software and others"
+	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
+	source: "[
+			Eiffel Software
+			5949 Hollister Ave., Goleta, CA 93117 USA
+			Telephone 805-685-1006, Fax 805-685-6869
+			Website http://www.eiffel.com
+			Customer support http://support.eiffel.com
+		]"
+end

src/service/response/cms_response.e

@@ -453,6 +453,29 @@ feature -- Blocks initialization
 			end
 		end
 
+	block_cache (a_block_id: READABLE_STRING_8): detachable TUPLE [block: CMS_CACHE_BLOCK; region: READABLE_STRING_8; expired: BOOLEAN]
+			-- Cached version of block `a_block_id'.
+		local
+			l_cache: CMS_FILE_STRING_8_CACHE
+		do
+			if
+				attached setup.text_item ("blocks." + a_block_id + ".expiration") as nb_secs and then
+				nb_secs.is_integer
+			then
+				if attached block_region_preference (a_block_id, "none") as l_region and then not l_region.same_string_general ("none") then
+					create l_cache.make (api.files_location.extended (".cache").extended ("blocks").extended (a_block_id).appended_with_extension ("html"))
+					if
+						l_cache.exists and then
+						not l_cache.expired (Void, nb_secs.to_integer)
+					then
+						Result := [create {CMS_CACHE_BLOCK} .make (a_block_id, l_cache), l_region, False]
+					else
+						Result := [create {CMS_CACHE_BLOCK} .make (a_block_id, l_cache), l_region, True]
+					end
+				end
+			end
+		end
+
 feature -- Blocks regions
 
 	regions: STRING_TABLE [CMS_BLOCK_REGION]
@@ -786,6 +809,7 @@ feature -- Generation
 			l_region: CMS_BLOCK_REGION
 			l_menu_list_prepared: ARRAYED_LIST [CMS_LINK_COMPOSITE]
 			l_empty_blocks: detachable ARRAYED_LIST [CMS_BLOCK]
+			l_block_html: STRING
 		do
 				-- Menu
 			create {CMS_LOCAL_LINK} lnk.make ("Home", "")
@@ -884,7 +908,13 @@ feature -- Generation
 							end
 						end
 					end
-					page.add_to_region (theme.block_html (ic.item), reg_ic.item.name)
+					l_block_html := theme.block_html (ic.item)
+					if attached {CMS_CACHE_BLOCK} ic.item then
+
+					elseif attached block_cache (ic.item.name) as l_cache_block then
+						l_cache_block.block.cache.put (l_block_html)
+					end
+					page.add_to_region (l_block_html, reg_ic.item.name)
 				end
 			end