Add genprocessor project

Signed-off-by: Michael Hwang <mhwang@research.att.com>
Issue-ID: DCAEGEN2-1860
Change-Id: Ie22a30ed8c72327ff0a28afa64ae53d8d6458a0c

1 files changed, 84 insertions, 0 deletions

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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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