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Chapter 89. JT400

JT/400 Component
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The jt400 component allows you to exchanges messages with an AS/400 system using data queues.

URI format
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jt400://user:password@system/QSYS.LIB/LIBRARY.LIB/QUEUE.DTAQ[?options]
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To call a remote program (Camel 2.7) 
jt400://user:password@system/QSYS.LIB/LIBRARY.LIB/program.PGM[?options]
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You can append query options to the URI in the following format, ?option=value&option=value&...

URI options
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For the data queue message exchange:
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Name Default value Description
ccsid default system CCSID Specifies the CCSID to use for the connection with the AS/400 system.
format text Specifies the data format for sending messages valid options are: text (represented by String) and binary (represented by byte[])
consumer.delay 500 Delay in milliseconds between each poll.
consumer.initialDelay 1000 Milliseconds before polling starts.
consumer.userFixedDelay false true to use fixed delay between polls, otherwise fixed rate is used. See ScheduledExecutorService in JDK for details.
guiAvailable false Camel 2.8: Specifies whether AS/400 prompting is enabled in the environment running Camel.
keyed false *Camel 2.10:* Whether to use keyed or non-keyed data queues.
searchKey null *Camel 2.10:* Search key for keyed data queues.
searchType EQ *Camel 2.10:* Search type which can be a value of EQ, NE, LT, LE, GT, or GE.
connectionPool AS400ConnectionPool instance *Camel 2.10:* Reference to an com.ibm.as400.access.AS400ConnectionPool instance in the Registry. This is used for obtaining connections to the AS/400 system. The look up notation ('#' character) should be used.
secured false Camel 2.16: Whether to use SSL connections to the AS/400.
For the remote program call (Camel 2.7):
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Name Default value Description
outputFieldsIdx Specifies which fields (program parameters) are output parameters.
fieldsLength Specifies the fields (program parameters) length as in the AS/400 program definition.
format text *Camel 2.10:* Specifies the data format for sending messages valid options are: text (represented by String) and binary (represented by byte[])
guiAvailable false *Camel 2.8:* Specifies whether AS/400 prompting is enabled in the environment running Camel.
connectionPool AS400ConnectionPool instance *Camel 2.10:* Reference to an com.ibm.as400.access.AS400ConnectionPool instance in the Registry. This is used for obtaining connections to the AS/400 system. The look up notation ('#' character) should be used.

Usage
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When configured as a consumer endpoint, the endpoint will poll a data queue on a remote system. For every entry on the data queue, a new Exchange is sent with the entry's data in the In message's body, formatted either as a String or a byte[], depending on the format. For a provider endpoint, the In message body contents will be put on the data queue as either raw bytes or text.

Connection pool
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Available as of Camel 2.10
Connection pooling is in use from Camel 2.10 onwards. You can explicit configure a connection pool on the Jt400Component, or as an uri option on the endpoint.

Remote program call (Camel 2.7)
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This endpoint expects the input to be either a String array or byte[] array (depending on format) and handles all the CCSID handling through the native jt400 library mechanisms. A parameter can be omitted by passing null as the value in its position (the remote program has to support it). After the program execution the endpoint returns either a String array or byte[] array with the values as they were returned by the program (the input only parameters will contain the same data as the beginning of the invocation) This endpoint does not implement a provider endpoint!

Example
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In the snippet below, the data for an exchange sent to the direct:george endpoint will be put in the data queue PENNYLANE in library BEATLES on a system named LIVERPOOL. Another user connects to the same data queue to receive the information from the data queue and forward it to the mock:ringo endpoint. 
public class Jt400RouteBuilder extends RouteBuilder {

    @Override
    public void configure() throws Exception {
       from("direct:george").to("jt400://GEORGE:EGROEG@LIVERPOOL/QSYS.LIB/BEATLES.LIB/PENNYLANE.DTAQ");
       from("jt400://RINGO:OGNIR@LIVERPOOL/QSYS.LIB/BEATLES.LIB/PENNYLANE.DTAQ").to("mock:ringo");
    }
}
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Remote program call example (Camel 2.7)
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In the snippet below, the data Exchange sent to the direct:work endpoint will contain three string that will be used as the arguments for the program "compute" in the library "assets". This program will write the output values in the 2nd and 3rd parameters. All the parameters will be sent to the direct:play endpoint. 
public class Jt400RouteBuilder extends RouteBuilder {
    @Override
    public void configure() throws Exception {
       from("direct:work").to("jt400://GRUPO:ATWORK@server/QSYS.LIB/assets.LIB/compute.PGM?fieldsLength=10,10,512&ouputFieldsIdx=2,3").to("direct:play");
    }
}
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Writing to keyed data queues
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from("jms:queue:input")
.to("jt400://username:password@system/lib.lib/MSGINDQ.DTAQ?keyed=true");
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Reading from keyed data queues
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from("jt400://username:password@system/lib.lib/MSGOUTDQ.DTAQ?keyed=true&searchKey=MYKEY&searchType=GE")
.to("jms:queue:output");
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