public void install(ProjectBuildingRequest buildingRequest,
           ProjectInstallerRequest request)
             throws IOException,
                    ArtifactInstallerException,
                    NoFileAssignedException

This will install a single project which may contain several artifacts. Those artifacts will be installed into the appropriate repository.

  @Parameter( defaultValue = "${session}", required=true, readonly = true)
  private MavenSession session;
  @Parameter( defaultValue = "${project}", required=true, readonly = true)
  private MavenProject project;
  ..
  @Component
  private ProjectInstaller installer;
  
    ProjectInstallerRequest pir =
      new ProjectInstallerRequest()
         .setProject( mavenProject )
         .setCreateChecksum( false )
         .setUpdateReleaseInfo( false );
  
  installer.install( session.getProjectBuildingRequest(), pir );
 

To set a different local repository than the current one in the Maven session, you can inject an instance of the RepositoryManager and set the path to the local repository, called localRepositoryPath, as such:

  @Component
  private RepositoryManager repositoryManager;
 
  buildingRequest = repositoryManager.setLocalRepositoryBasedir( buildingRequest, localRepositoryPath );