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Add support schema cache dump and load.

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1 parent 8cecb47 commit 5ca4fc95818047108e69e22d200e7a4a22969477 @kennyj kennyj committed Feb 29, 2012
@@ -6,21 +6,12 @@ class SchemaCache
def initialize(conn)
@connection = conn
- @tables = {}
- @columns = Hash.new do |h, table_name|
- h[table_name] = conn.columns(table_name)
- end
-
- @columns_hash = Hash.new do |h, table_name|
- h[table_name] = Hash[columns[table_name].map { |col|
- [col.name, col]
- }]
- end
-
- @primary_keys = Hash.new do |h, table_name|
- h[table_name] = table_exists?(table_name) ? conn.primary_key(table_name) : nil
- end
+ @columns = {}
+ @columns_hash = {}
+ @primary_keys = {}
+ @tables = {}
+ prepare_default_proc
end
# A cached lookup for table existence.
@@ -45,6 +36,35 @@ def clear_table_cache!(table_name)
@primary_keys.delete table_name
@tables.delete table_name
end
+
+ def marshal_dump
+ [:@columns, :@columns_hash, :@primary_keys, :@tables].map do |val|
+ self.instance_variable_get(val).inject({}) { |h, v| h[v[0]] = v[1]; h }
+ end
+ end
+
+ def marshal_load(array)
+ @columns, @columns_hash, @primary_keys, @tables = array
+ prepare_default_proc
+ end
+
+ private
+
+ def prepare_default_proc
+ @columns.default_proc = Proc.new do |h, table_name|
+ h[table_name] = connection.columns(table_name)
+ end
+
+ @columns_hash.default_proc = Proc.new do |h, table_name|
+ h[table_name] = Hash[columns[table_name].map { |col|
+ [col.name, col]
+ }]
+ end
+
+ @primary_keys.default_proc = Proc.new do |h, table_name|
+ h[table_name] = table_exists?(table_name) ? connection.primary_key(table_name) : nil
+ end
+ end
end
end
end
@@ -39,6 +39,21 @@ def test_clearing
assert_equal 0, @cache.tables.size
assert_equal 0, @cache.primary_keys.size
end
+
+ def test_dump_and_load
+ @cache.columns['posts']
+ @cache.columns_hash['posts']
+ @cache.tables['posts']
+ @cache.primary_keys['posts']
+
+ @cache = Marshal.load(Marshal.dump(@cache))
+
+ assert_equal 12, @cache.columns['posts'].size
+ assert_equal 12, @cache.columns_hash['posts'].size
+ assert @cache.tables['posts']
+ assert_equal 'id', @cache.primary_keys['posts']
+ end
+
end
end
end

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