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# Genprocessor
This project is a tool to experiment with generating a Nifi Processor POJO from a DCAE component spec.
Environment variables needed to run the app:
For generating -
`GENPROC_WORKING_DIR` - Full file path to the directory where you will generate class files to and ultimately build the jar to distribute
`GENPROC_ONBOARDING_API_HOST` - Onboarding API host URL
`GENPROC_PROCESSOR_CLASSFILE_PATH` - Path to the DCAEProcessor class file
For loading -
`GENPROC_JAR_INDEX_URL` - URL to the index.json for DCAE processor jars
## Build
NOTE: You need a specific version of the `nifi-api` jar that contains the class `BaseDCAEProcessor`.
Command to build and to copy dependencies into `target/dependency` directory:
```
mvn clean package dependency:copy-dependencies
```
## Run - Generate jars
This will pull all component specs from onboarding API and for each component:
* A class file is generated for a new DCAEProcessor class
* Write metadata into META-INF directory
* Copy a copy of the DCAEProcessor class file
* Package up into a jar
Command to run:
```
java -cp "target/genprocessor-1.0.1.jar:target/dependency/*" org.onap.dcae.genprocessor.App gen
```
### More about what goes into META-INF
#### Processor manifest
Note the META-INF directory which contains:
```
$ tree META-INF/
META-INF/
└── services
└── org.apache.nifi.processor.Processor
```
If you don't have the above in your `GENPROC_TARGET_DIR`, then:
```
$ mkdir -p META-INF/services
$ touch META-INF/services/org.apache.nifi.processor.Processor
```
Open `META-INF/services/org.apache.nifi.processor.Processor` and write the full class name for each generated processor on a separate line.
#### MANIFEST.MF
Write the `MANIFEST.MF` in a file that's arbitrarily named (mymanifest for example). The content should look like:
```
$ cat mymanifest
Manifest-Version: 1.0
Id: dcae-ves-collector
Version: 1.5.0
Group: org.onap.dcae
```
## Run - Load jars
This will load all jars listed on an index page and for each jar will do a class load and quick test.
Command to run:
```
java -cp "target/genprocessor-1.0.1.jar:target/dependency/*" org.onap.dcae.genprocessor.App load
```
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