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authorSteve Kemp <steve@steve.org.uk>2012-11-24 14:40:03 +0000
committerSteve Kemp <steve@steve.org.uk>2012-11-24 14:40:03 +0000
commit7bfaf7e94eed64dbc1e534e2eee0f9e224e6f146 (patch)
tree2ffeab10f8e977063bb003924ea27ac34b74cdd3 /lib/custodian/alertfactory.rb
parent04d4be3cf4f41ad6225ce57a9e3d92ae7260fc7e (diff)
Initial/stub implementation of a factory for generating alerting objects.
Diffstat (limited to 'lib/custodian/alertfactory.rb')
-rw-r--r--lib/custodian/alertfactory.rb70
1 files changed, 70 insertions, 0 deletions
diff --git a/lib/custodian/alertfactory.rb b/lib/custodian/alertfactory.rb
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+
+
+#
+#
+# Base class for custodian alerters.
+#
+# Each subclass will register themselves, via the call
+# to 'register_alert_type'.
+#
+# This class is a factory that will return the correct
+# derived class.
+#
+#
+module Custodian
+
+ class AlertFactory
+
+
+ #
+ # The subclasses we have.
+ #
+ @@subclasses = { }
+
+
+ #
+ # Create an alerter object, based upon the type
+ #
+ def self.create( alert_type, obj )
+
+ c = @@subclasses[alert_type]
+ if c
+ c.new( obj )
+ else
+ raise ArgumentError, "Bad alert type: '#{alert_type}'"
+ end
+ end
+
+
+ #
+ # Register a new test type - this must be called by our derived classes
+ #
+ def self.register_alert_type name
+ @@subclasses[name] = self
+ end
+
+
+ #
+ # Return an array of test-types we know about
+ #
+ # i.e. Derived classes that have registered themselves.
+ #
+ #
+ def self.known_alerters
+ @@subclasses
+ end
+
+
+
+ def raise
+ raise NoMethod, "This should be implemented in a derived class"
+ end
+
+
+
+ def clear
+ raise NoMethod, "This should be implemented in a derived class"
+ end
+ end
+
+end