Class: RubySync::Connectors::BaseConnector
- Includes:
- ConnectorEventProcessing, Utilities
- Defined in:
- lib/ruby_sync/connectors/base_connector.rb
Direct Known Subclasses
ActiveRecordConnector, FileConnector, LdapConnector, MemoryConnector, XmlConnector
Instance Attribute Summary collapse
-
#is_vault ⇒ Object
Returns the value of attribute is_vault.
-
#name ⇒ Object
Returns the value of attribute name.
-
#once_only ⇒ Object
Returns the value of attribute once_only.
-
#pipeline ⇒ Object
Returns the value of attribute pipeline.
Class Method Summary collapse
-
.class_for(connector_name) ⇒ Object
Ensures that the named connector is loaded and returns its class object.
-
.class_name_for(connector_name) ⇒ Object
Return the class name for a path style connector name.
-
.fields ⇒ Object
Return an array of possible fields for this connector.
-
.sample_config ⇒ Object
Override this to return a string that will be included within the class definition of of configurations based on your connector.
Instance Method Summary collapse
-
#add(id, operations) ⇒ Object
Subclasses must override this.
-
#associate(association, path) ⇒ Object
Store association for the given path.
-
#association_context ⇒ Object
The context to be used to for all associations created where this connector is the client.
-
#association_for(context, path) ⇒ Object
Return the association object given the association context and path.
- #association_key_for(context, path) ⇒ Object
-
#association_to_path_dbm_filename ⇒ Object
Stores paths indexed by association_context:association_key.
- #associations_for(path) ⇒ Object
-
#can_act_as_vault? ⇒ Boolean
Whether this connector is capable of acting as a vault.
- #clean ⇒ Object
-
#create_operations_for(record) ⇒ Object
Return an array of operations that would create the given record if applied to an empty hash.
-
#dbm_path ⇒ Object
set a default dbm path.
- #digest(o) ⇒ Object
-
#each_change ⇒ Object
Subclasses must override this to interface with the external system and generate an event for every change that affects items within the scope of this connector.
-
#each_entry ⇒ Object
Subclasses must override this to interface with the external system and generate entries for every entry in the scope passing the entry path (id) and its data (as a hash of arrays).
-
#entry_for_own_association_key(key) ⇒ Object
Returns the entry matching the association key.
-
#find_associated(association) ⇒ Object
Should only be called on the vault.
-
#has_entry_for_key?(key) ⇒ Boolean
True if there is an entry matching the association key.
-
#initialize(options = {}) ⇒ BaseConnector
constructor
A new instance of BaseConnector.
-
#is_delete_echo?(event) ⇒ Boolean
Attempts to delete non-existent items may occur due to echoing.
- #is_echo?(event) ⇒ Boolean
- #is_vault? ⇒ Boolean
-
#mirror_dbm_filename ⇒ Object
Stores a hash for each entry so we can tell when entries are added, deleted or modified.
-
#own_association_key_for(path) ⇒ Object
Returns the association key for the given path.
- #path_for_association(association) ⇒ Object
-
#path_for_own_association_key(key) ⇒ Object
Returns the appropriate entry for the association key.
-
#path_to_association_dbm_filename ⇒ Object
Stores association keys indexed by path:association_context.
- #remove_association(association) ⇒ Object
- #remove_associations ⇒ Object
- #remove_mirror ⇒ Object
-
#start(&blk) ⇒ Object
Call each_change repeatedly (or once if in once_only mode) to generate events.
-
#started ⇒ Object
Override this to perform actions that must be performed the when the connector starts running.
-
#stop ⇒ Object
Politely stop the connector.
-
#stopped ⇒ Object
Override this to perform actions that must be performed when the connector exits (eg closing network conections).
-
#sync_started ⇒ Object
Called by start() before first call to each_change or each_entry.
-
#sync_stopped ⇒ Object
Called by start() after last call to each_change or each_entry.
-
#test_add(id, details) ⇒ Object
Called by unit tests to inject data.
-
#test_delete(id) ⇒ Object
Called by unit tests to delete a record.
-
#test_modify(id, details) ⇒ Object
Called by unit tests to modify data.
Methods included from Utilities
#as_array, #call_if_exists, #connector_called, #effective_operations, #ensure_dir_exists, #get_preference, #get_preference_file_path, #include_in_search_path, #log_progress, #perform_operations, #pipeline_called, #set_preference, #something_called, #with_rescue
Constructor Details
#initialize(options = {}) ⇒ BaseConnector
Returns a new instance of BaseConnector.
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 53 def initialize ={} base_path # call this once to get the working directory before anything else # in the connector changes the cwd = self.class..merge() once_only = false self.name = [:name] self.is_vault = [:is_vault] if is_vault && !can_act_as_vault? raise "#{self.class.name} can't act as an identity vault." end .each do |key, value| if self.respond_to? "#{key}=" self.send("#{key}=", value) else log.debug "#{name}: doesn't respond to #{key}=" end end end |
Instance Attribute Details
#is_vault ⇒ Object
Returns the value of attribute is_vault.
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 27 def is_vault @is_vault end |
#name ⇒ Object
Returns the value of attribute name.
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 27 def name @name end |
#once_only ⇒ Object
Returns the value of attribute once_only.
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 27 def once_only @once_only end |
#pipeline ⇒ Object
Returns the value of attribute pipeline.
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 27 def pipeline @pipeline end |
Class Method Details
.class_for(connector_name) ⇒ Object
Ensures that the named connector is loaded and returns its class object
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 372 def self.class_for connector_name name = class_name_for connector_name (name)? eval(name) : nil end |
.class_name_for(connector_name) ⇒ Object
Return the class name for a path style connector name
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 378 def self.class_name_for connector_name '::' + "#{connector_name}_connector".camelize end |
.fields ⇒ Object
Return an array of possible fields for this connector. Implementations should override this to query the datasource for possible fields.
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 367 def self.fields nil end |
.sample_config ⇒ Object
Override this to return a string that will be included within the class definition of of configurations based on your connector.
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 83 def self.sample_config end |
Instance Method Details
#add(id, operations) ⇒ Object
Subclasses must override this. Called by perform_add to actually store the new record in the datastore. Returned value will be used as the association id if this connector is acting as the client.
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 76 def add id, operations raise "add method not implemented" end |
#associate(association, path) ⇒ Object
Store association for the given path
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 238 def associate association, path YAML::DBM.open(path_to_association_dbm_filename) do |dbm| assocs = dbm[path.to_s] || {} assocs[association.context.to_s] = association.key.to_s dbm[path.to_s] = assocs end DBM.open(association_to_path_dbm_filename) do |dbm| dbm[association.to_s] = path end end |
#association_context ⇒ Object
The context to be used to for all associations created where this connector is the client.
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 302 def association_context self.name end |
#association_for(context, path) ⇒ Object
Return the association object given the association context and path. This should only be called on the vault.
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 285 def association_for(context, path) raise "#{name} is not a vault." unless is_vault? key = association_key_for context, path key and RubySync::Association.new(context, key) end |
#association_key_for(context, path) ⇒ Object
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 275 def association_key_for context, path YAML::DBM.open(path_to_association_dbm_filename) do |dbm| assocs = dbm[path.to_s] || {} assocs[context.to_s] end end |
#association_to_path_dbm_filename ⇒ Object
Stores paths indexed by association_context:association_key
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 43 def association_to_path_dbm_filename dbm_path + "_assoc_to_path" end |
#associations_for(path) ⇒ Object
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 256 def associations_for path YAML::DBM.open(path_to_association_dbm_filename) do |dbm| assocs = dbm[path.to_s] assocs.values end end |
#can_act_as_vault? ⇒ Boolean
Whether this connector is capable of acting as a vault. The vault is responsible for storing the association key of the client application and must be able to retrieve records for that association key.
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 228 def can_act_as_vault? defined? associate and defined? path_for_association and defined? association_key_for and defined? remove_association and defined? associations_for end |
#clean ⇒ Object
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 314 def clean remove_associations remove_mirror end |
#create_operations_for(record) ⇒ Object
Return an array of operations that would create the given record if applied to an empty hash.
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 357 def create_operations_for record record.keys.map {|key| RubySync::Operation.new(:add, key, record[key])} end |
#dbm_path ⇒ Object
set a default dbm path
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 31 def dbm_path() p = "#{base_path}/db" ::FileUtils.mkdir_p p ::File.join(p,name) end |
#digest(o) ⇒ Object
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 128 def digest(o) Digest::MD5.hexdigest(o.to_yaml) end |
#each_change ⇒ Object
Subclasses must override this to interface with the external system and generate an event for every change that affects items within the scope of this connector. todo: Make the default behaviour to build a database of the key of each entry with a hash of the contents of the entry. Then to compare that against each entry to see if it has changed.
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 102 def each_change DBM.open(self.mirror_dbm_filename) do |dbm| # scan existing entries to see if any new or modified each_entry do |path, entry| digest = digest(entry) unless stored_digest = dbm[path.to_s] and digest == stored_digest operations = create_operations_for(entry) yield RubySync::Event.add(self, path, nil, operations) dbm[path.to_s] = digest end end # scan dbm to find deleted dbm.each do |key, stored_hash| unless self[key] yield RubySync::Event.delete(self, key) dbm.delete key if is_vault? and @pipeline association = association_for @pipeline.association_context, key remove_association association end end end end end |
#each_entry ⇒ Object
Subclasses must override this to interface with the external system and generate entries for every entry in the scope passing the entry path (id) and its data (as a hash of arrays). This method will be called repeatedly until the connector is stopped.
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 92 def each_entry raise "Not implemented" end |
#entry_for_own_association_key(key) ⇒ Object
Returns the entry matching the association key. This is only called on the client.
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 214 def entry_for_own_association_key(key) self[path_for_own_association_key(key)] end |
#find_associated(association) ⇒ Object
Should only be called on the vault. Returns the entry associated with the association passed. Some connectors may wish to override this if they have a more efficient way of retrieving the record for a given association.
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 295 def find_associated association path = path_for_association association path and self[path] end |
#has_entry_for_key?(key) ⇒ Boolean
True if there is an entry matching the association key. Only called on the client. Override if you have a quicker way of determining whether an entry exists for given key than retrieving the entry.
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 221 def has_entry_for_key?(key) entry_for_own_association_key(key) end |
#is_delete_echo?(event) ⇒ Boolean
Attempts to delete non-existent items may occur due to echoing. Many systems won’t be able to record the fact that an entry has been deleted by rubysync because after the delete, there is no entry left to record the information in. Therefore, they may issue a notification that the item has been deleted. This becomes an event and the connector won’t know that it caused the delete. The story usually has a reasonably happy ending though. The inappropriate delete event is processed by the pipeline and a delete attempt is made on the datastore that actually triggered the original delete event in the first place. Most of the time, there will be no entry there for it to delete and it will fail harmlessly. Problems may arise, however, if the original delete event was the result of manipulation in the pipeline and the original entry is in fact supposed to stay there. For example, say a student in an enrolment system was marked as not enrolled anymore. This modify event is translated by the pipeline that connects to the identity vault to become a delete because only the enrolment system is interested in non-enrolled students. As the student is removed from the identity vault, a new delete event is generated targeted back and the enrolment system. If the pipeline has been configured to honour delete requests from the vault to the enrolment system then the students entry in the enrolment system would be deleted.
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 334 def is_delete_echo? event false #TODO implement delete event caching end |
#is_echo?(event) ⇒ Boolean
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 338 def is_echo? event; false end |
#is_vault? ⇒ Boolean
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 190 def is_vault? @is_vault end |
#mirror_dbm_filename ⇒ Object
Stores a hash for each entry so we can tell when entries are added, deleted or modified
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 49 def mirror_dbm_filename dbm_path + "_mirror" end |
#own_association_key_for(path) ⇒ Object
Returns the association key for the given path. Called if this connector is the client. The default implementation returns the path itself. If there is a more efficient key for looking up an entry in the client, override to return that instead.
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 200 def own_association_key_for(path) path end |
#path_for_association(association) ⇒ Object
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 249 def path_for_association association is_vault? or return path_for_own_association_key(association.key) DBM.open(association_to_path_dbm_filename) do |dbm| dbm[association.to_s] end end |
#path_for_own_association_key(key) ⇒ Object
Returns the appropriate entry for the association key. This key will have been provided by a previous call to the association_key method. This will only be called on the client connector. It is not expected that the client will have to store this key.
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 209 def path_for_own_association_key(key) key end |
#path_to_association_dbm_filename ⇒ Object
Stores association keys indexed by path:association_context
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 38 def path_to_association_dbm_filename dbm_path + "_path_to_assoc" end |
#remove_association(association) ⇒ Object
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 264 def remove_association association path = nil DBM.open(association_to_path_dbm_filename) do |dbm| return unless path =dbm.delete(association.to_s) end YAML::DBM.open(path_to_association_dbm_filename) do |dbm| assocs = dbm[path.to_s] assocs.delete(association.context) and dbm[path.to_s] = assocs end end |
#remove_associations ⇒ Object
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 310 def remove_associations File.delete_if_exists(["#{association_to_path_dbm_filename}.db","#{path_to_association_dbm_filename}.db"]) end |
#remove_mirror ⇒ Object
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 306 def remove_mirror File.delete_if_exists(["#{mirror_dbm_filename}.db"]) end |
#start(&blk) ⇒ Object
Call each_change repeatedly (or once if in once_only mode) to generate events. Should generally only be called by the pipeline to which it is attached.
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 137 def start &blk log.debug "#{name}: Started" @running = true sync_started() while @running each_change do |event| if event.type == :force_resync each_entry(&blk) next end if is_delete_echo?(event) || is_echo?(event) log.debug "Ignoring echoed event" else call_if_exists :source_transform, event yield(event) end end if once_only log.debug "#{name}: Stopped" @running = false else log.debug "#{name}: sleeping" sleep 1 end end sync_stopped end |
#started ⇒ Object
Override this to perform actions that must be performed the when the connector starts running. (Eg, opening network connections)
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 175 def started end |
#stop ⇒ Object
Politely stop the connector.
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 184 def stop log.info "#{name}: Attempting to stop" @running = false end |
#stopped ⇒ Object
Override this to perform actions that must be performed when the connector exits (eg closing network conections).
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 180 def stopped; end |
#sync_started ⇒ Object
Called by start() before first call to each_change or each_entry
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 171 def sync_started; end |
#sync_stopped ⇒ Object
Called by start() after last call to each_change or each_entry
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 168 def sync_stopped; end |
#test_add(id, details) ⇒ Object
Called by unit tests to inject data
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 341 def test_add id, details add id, details end |
#test_delete(id) ⇒ Object
Called by unit tests to delete a record
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 351 def test_delete id delete id end |
#test_modify(id, details) ⇒ Object
Called by unit tests to modify data
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# File 'lib/ruby_sync/connectors/base_connector.rb', line 346 def test_modify id, details modify id, details end |