components

Components

The following table shows a list of available components.

Icon	Name	Use When
Readers
	Binary File Reader	Data needs read from a binary file
	Email Reader	Data needs read from an Email account
	Excel File Reader	Data needs read from an Excel file
	File Poller	A file based resource needs to be checked for the existence of a file or set of files
	RDBMS Reader	Data needs read from a relational database
	Text Constant	A text constant is needed in message content in the flow
	Text File Reader	Data needs read from a text file
	Unzip	A compressed zip file needs to be extracted in order to process its content
	XML Reader	An XML file needs to be read and element content of that file sent as individual messages
Processors
	Assert	Check for an assertion
	Content Router	Content within a message needs to be routed to different downstream components in the existing flow
	DeDupe	Input model based records must be deduplicated before being sent to downstream components
	Delay	A delay is needed when sending data between components
	Deserializer	A component that will parse XML or JSON to a Model
	Embed Flow	A flow needs to be embedded in another flow
	Execute	There is a need to execute an operating system command as part of a flow
	File Util	Files need to be renamed, copied, moved or deleted
	Format Delimited	Model based data needs to be formatted into delimited text
	Format Fixed	Model based data needs to be formatted into fixed length text
	Format XML	Model based data needs to be formatted into xml text
	Lookup	Reference data exists that needs to be looked up / retrieved by a specified key, and another attribute of the the resulting reference data passed to downstream components.
	Mapping	Data needs to be mapped from one set of entities/attributes (model structure) to another set of entities/attributes
	Rel/Hier Mapping	Data needs to be mapped from a relational model to a hierarchical model
	Merger	Different instances of model based records need to be merged into a single instance that combines the attributes from all instances.
	Message Filter	Messages need to be filtered based on header and/or flow parameters
	Message Logger	Messages need to be logged to the Metl console and log file
	Model Data Diff	A set of model based data needs compared to another set of model based data in order to generate insert/update/delete instructions for a writer component
	Multiplier	Inbound messages need to be multiplied (duplicated n number of times) and the sent to downstream components.
	No Op	A message needs to be passed through to another component without any action being taken on the message
	Parse Delimited	An inbound text message in some delimited text format needs to be parsed into a model based message structure
	Parse Fixed	An inbound text message in a fixed length text format needs to be parsed into a model based message structure
	Parse XML	An inbound text message in xml text format needs to be parsed into a model based message structure
	Script	A custom action should be performed that can be written using Groovy
	Serializer	A component that will format an entity to XML or JSON
	Sequence	A sequence number needs to be created for a given attribute in a model based record, and the starting value of the sequence can be derived by an sql statement.
	Sorter	Data within a model based message needs to be sorted by one of the attributes within the model
	Temp RDBMS	Entity message data needs to be staged and queried using SQL.
	Text Replace	A piece of text in a text based message needs replaced with alternate text
	Transformer	An attribute in a model based message needs transformed in one way or another (trim, substring, constants, etc.)
	Union	Inbound messages need to be combined into a single message and then sent to downstream components.
	Web Request	A web service (either REST or WSDL) needs to be called to perform an action such as retrieving or writing data
	XSLT Processor	XSLT needs applied to a set of input data in order to transform it into a given output format
Writers
	Binary File Writer	Data needs written to a binary file
	Email Writer	An email needs to be sent
	Excel File Writer	Data needs written to an Excel file
	RDBMS Writer	Data needs written to a relational database
	SQL Executor	Data needs written to or deleted from a database using a specific sql statement
	Text File Writer	Data needs written to a text based file
	Zip	Data needs to be put in a compressed file
Services
	Http Request	A RESTful service needs to be created and hosted by the Metl server
	Http Response	A RESTful service needs to be created and hosted by the Metl server
	Subscriber	A component that registers with a pub/sub system (like JMS). Works with resources that support subscriptions
Controls
	Gate	Flow needs controlled by one input before remaining process continues
	Last Unit of Work	Flow needs to be held at this point until all inputs complete before continuing