Writing Front-Ends - JEB Decompiler
Author: PNF Software

# Writing Front-Ends

JEB front-end are also referred to as "JEB clients" (or "JEB third-party clients", to contrast with the "official UI desktop client").

JEB back-end API makes writing new clients (aka, front-ends) an easy task. A client can be:

- An automated client (for testing, for an automation pipeline)
- A command-line client
- A graphical front-end (eg, the official UI desktop client)
- ...

> Note: Not all JEB licenses allow the creation of third-party clients. Verify this by checking your license information in the About dialog box. It should show any-client. Typically, JEB Pro licenses allow the execution of third-party clients.

## High-level Instructions

Use the provided source code template (see below) as a base for your client. The basic steps any client should take are the following:

- Use JebCoreService to retrieve an instance to ICoreContext
- Create an IEnginesContext
- Load a project within that context (IRuntimeProject)
- Add artifacts and process them (ILiveArtifact)
- Retrieve the products (IUnit)
- Proceed as usual with the units
  - We recommend developers to read our tutorial series on parser development to get familiar with units

Refer to the our simplified architecture diagrams to better visualize how those components are connected to one another.

## Source Template

Full source code: Command-line client skeleton on GitHub

    public class AutoClient {
        static final ILogger logger = GlobalLog.getLogger(AutoClient.class);
        static {
            GlobalLog.addDestinationStream(System.out);
        }

        // TODO: customize (should be replaced by the LicenseKey entry in your bin/jeb-client.cfg file)
        private static final String licenseKey = "...";

        // TODO: customize
        private static final String baseDir = "...";

        public static void main(String[] argv) throws Exception {
            if(argv.length <= 0) {
                return;
            }

            long t0 = System.currentTimeMillis();
            String location = argv[0];
            List<File> files = AutoUtil.retrieveFiles(location);
            test(files);
            logger.info("Done in %ds", (System.currentTimeMillis() - t0) / 1000);
        }

        /**
         * Initialize a core. Create a context within that core. Then, for each input artifact, a
         * project is created and the artifact is loaded within that project.
         */
        public static void test(List<File> files) throws Exception {
            // create or retrieve a core context (engines container)
            ICoreContext core = JebCoreService.getInstance(licenseKey);

            // create an engines context (project container)
            IFileDatabase projectdb = new JEB2FileDatabase(baseDir);
            IFileStore filestore = new SimpleFSFileStore(baseDir);
            BaseConfiguration cfg = new BaseConfiguration();

            // TODO: customize (alternative is to read your configuration from .cfg file)
            cfg.setProperty(".DevPluginClasspath", "...");

            // TODO: customize
            cfg.setProperty(".DevPluginClassnames", "...");

            IConfiguration config = new CommonsConfigurationWrapper(cfg);
            IDataProvider dataProvider = new DataProvider(null, projectdb, filestore, null, null, config);
            IEnginesContext engctx = core.createEnginesContext(dataProvider, null);

            int i = 0;
            for(File file: files) {
                i++;
                logger.info("Testing file %d/%d : %s ...", i, files.size(), file.getName());

                // create or load a project (artifact container)
                IRuntimeProject prj = engctx.loadProject("ProjectTest" + i);

                // process the artifact, get units
                ILiveArtifact art = prj.processArtifact(new Artifact(file.getName(), new FileInput(file)));

                // proceed with the units
                List<IUnit> units = art.getUnits();

                // TODO: CUSTOMIZE -- this is the important part
                // Basic tests go here
                // example:
                for(IUnit unit: units) {
                    logger.info("Unit: %s", unit);
                    //if(unit instanceof Xyz) {
                    // ...
                    //}
                }

                engctx.unloadProject(prj.getKey());
            }

            // close the engines
            JebCoreService.getInstance().closeEnginesContext(engctx);
        }
    }

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