Spike: Figure out how to plug JSON schema in from external library (jar file) into a module

https://issues.folio.org/browse/MODUSERS-140

Description:

There is a need to use external JSON schema(s) to describe data in RAML API interfaces. 
The schema is expected to reside inside a jar file which attached to a module as a regular dependency.
If the above is not achievable – propose any options of how external schemas can be used in a module with minimal effort

Results:

    1. Include JSON schemas as a dependency to the module using maven plugins

Approach:

• add a dependency to the target module
• include following plugins to the .pom file
  •  Add a plugin to unpack RAML and JSON files 

    This plugin unpack the files of particular dependency

    <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-dependency-plugin</artifactId>
            <version>3.1.0</version>
            <executions>
              <execution>
                <id>unpack</id>
                <phase>prepare-package</phase>
                <goals>
                  <goal>unpack</goal>
                </goals>
                <configuration>
                  <artifactItems>
                    <artifactItem>
                      <groupId>org.folio</groupId>
                      <artifactId>mod-data-upload</artifactId>
                      <outputDirectory>${ramlfiles_path}</outputDirectory>
                      <overWrite>true</overWrite>
                      <includes>ramls/</includes>
                      <excludes>ramls/raml-util/, ramls/*.list</excludes>
                    </artifactItem>
                  </artifactItems>
                  <overWriteReleases>false</overWriteReleases>
                  <overWriteSnapshots>true</overWriteSnapshots>
                </configuration>
              </execution>
            </executions>
          </plugin>

  •  clean up the folder

    the following property seems not working for the maven-dependency-plugin

    <overWrite>true</overWrite>

    this means that every time you need to build the project you have to remove the folder manually.

    To simply this process add the maven-clean-plugin to do it automatically by specifying the folder

    <plugin>
            <artifactId>maven-clean-plugin</artifactId>
            <version>3.1.0</version>
            <configuration>
              <filesets>
                <fileset>
                  <directory>ramls/ramls</directory>
                  <followSymlinks>false</followSymlinks>
                </fileset>
              </filesets>
            </configuration>
          </plugin>

  •  and finally, add the ant-run plugin

    After the module builds, all references to files will point to exact files in the current system:

    

    which is not convenient to use in case of the different build environments.

    The following plugin task will replace found lines, specifying the path to file and cut it to leave only the file name.

    <plugin>
            <artifactId>maven-antrun-plugin</artifactId>
            <version>1.8</version>
            <executions>
              <execution>
                <phase>prepare-package</phase>
                <goals>
                  <goal>run</goal>
                </goals>
                <configuration>
                  <tasks>
                    <replaceregexp match="(file:.*[/])" replace="" byline="true">
                      <fileset dir="${ramlfiles_path}/ramls" includes="**/*.json" />
                    </replaceregexp>
                  </tasks>
                </configuration>
              </execution>
            </executions>
          </plugin>

      2. Add plugin to RMB to manage references 

Approach:

• From the jsonschema2pojo Wiki documentation there is possible to specify the path to the referenced object by classpath:, resource: 

      3. Add schemas to RAML module 

Approach:

• Add all needed files to the FOLIO Raml module

Useful links:

• Maven-Antrun-Plugin
• Maven-Dependency-Plugin: Unpack