Add genprocessor project

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

10 files changed, 1080 insertions, 0 deletions

diff --git a/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/App.java b/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/App.java
new file mode 100644
index 0000000..9996b71
--- /dev/null
+++ b/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/App.java
@@ -0,0 +1,382 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.dcae.genprocessor;
+
+import javassist.CannotCompileException;
+import javassist.ClassPool;
+import javassist.CtClass;
+
+import java.io.File;
+import java.io.FilenameFilter;
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.FileAlreadyExistsException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import java.util.ServiceLoader;
+import java.util.jar.Manifest;
+import java.util.stream.Collectors;
+
+import com.fasterxml.jackson.core.JsonFactory;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import java.util.jar.Attributes;
+
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.processor.Processor;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Hello world!
+ *
+ */
+public class App {
+    static final Logger LOG = LoggerFactory.getLogger(App.class);
+
+    // NOTE: For each new processor, need to: change jar command, change meta-inf
+    private static String createClassName(CompSpec compSpec) {
+        return String.format("org.onap.dcae.%s", compSpec.nameJavaClass);
+    }
+
+    /**
+     * Does a series of DCAEProcessor specific verification checks on the generated
+     * class.
+     * 
+     * @param cc
+     * @return true if verification is successful
+     */
+    private static boolean verifyGen(CtClass cc) {
+        DCAEProcessor processor;
+        try {
+            processor = (DCAEProcessor) cc.toClass().newInstance();
+        } catch (InstantiationException | IllegalAccessException | CannotCompileException e) {
+            LOG.error(e.toString(), e);
+            return false;
+        }
+        java.lang.annotation.Annotation[] anns = processor.getClass().getAnnotations();
+        LOG.info(String.format("#Annotations on class: %d", anns.length));
+
+        for (java.lang.annotation.Annotation ann : anns) {
+            if (ann.annotationType().getName().contains("Description")) {
+                LOG.info(String.format("CapabilityDescription: %s", ((CapabilityDescription) ann).value()));
+            } else if (ann.annotationType().getName().contains("Tags")) {
+                LOG.info(String.format("Tags: %s", String.join(", ", ((Tags) ann).value())));
+            }
+        }
+
+        LOG.info(String.format("Processor getters:\nname=%s\nversion=%s\nid=%s\nselfUrl=%s", processor.getName(),
+                processor.getVersion(), processor.getComponentId(), processor.getComponentUrl()));
+
+        LOG.info(String.format("#Property descriptors: %d", processor.getPropertyDescriptors().size()));
+
+        if (processor.getPropertyDescriptors().size() > 0) {
+            LOG.info(processor.getPropertyDescriptors().get(0).toString());
+        }
+
+        LOG.info(String.format("#Relationships: %d", processor.getRelationships().size()));
+
+        // Actually do checks
+        return true;
+    }
+
+    /**
+     * Generates a new DCAEProcessor class given a Component object and writes the
+     * class file to a specified directory.
+     * 
+     * @param directoryName where generated class files will get written
+     * @param comp          Component object to generate new DCAEProcessor classes
+     */
+    public static void generateClassFile(String directoryName, Comp comp) {
+        LOG.info("Generating classes");
+
+        try {
+            ClassPool pool = ClassPool.getDefault();
+            CtClass base = pool.get(DCAEProcessor.class.getName());
+
+            CtClass cc = pool.makeClass(createClassName(comp.compSpec));
+            cc.setSuperclass(base);
+
+            String[] tags = ProcessorBuilder.createTags(comp.compSpec);
+
+            ProcessorBuilder.addAnnotationsProcessor(cc, comp.compSpec.description, tags);
+            ProcessorBuilder.setComponentPropertyGetters(cc, comp);
+            ProcessorBuilder.setProcessorPropertyDescriptors(cc, comp.compSpec);
+            ProcessorBuilder.setProcessorRelationships(cc, comp.compSpec);
+
+            if (verifyGen(cc)) {
+                cc.writeFile(directoryName);
+            }
+        } catch (Exception e) {
+            LOG.error("Uhoh", e);
+        }
+    }
+
+    private static List<String> generateManifestMF(CompSpec compSpec) {
+        return Arrays.asList("Manifest-Version: 1.0", String.format("Id: %s", compSpec.name),
+                String.format("Version: %s", compSpec.version)
+                // TODO: Group is hardcoded here. Should it be?
+                , "Group: org.onap.dcae");
+    }
+
+    private static void writeManifestThing(File dirTarget, List<String> lines, String subDir, String fileName) {
+        File dirManifest = new File(dirTarget, subDir);
+
+        if (dirManifest.exists() || dirManifest.mkdirs()) {
+            Path path = Paths.get(dirManifest.getAbsolutePath(), fileName);
+            try {
+                Files.write(path, lines, StandardCharsets.UTF_8);
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
+        } else {
+            throw new RuntimeException("Could not create Manifest directory");
+        }
+    }
+
+    private static boolean copyProcessorClassFile(File pathClassFile, File dirBuild) {
+        File dirSandbox = new File(dirBuild, "org/onap/dcae/genprocessor");
+
+        if (dirSandbox.exists() || dirSandbox.mkdir()) {
+            try {
+                File dest = new File(dirSandbox, pathClassFile.getName());
+                Files.copy(pathClassFile.toPath(), dest.toPath());
+                return true;
+            } catch (FileAlreadyExistsException e) {
+                // Do nothing, class file already exists
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            } 
+        }
+
+        return false;
+    }
+
+    private static File getDirectoryForJars(File dirWorking) {
+        return new File(dirWorking, "nifi-jars");
+    }
+
+    private static boolean packageJar(File dirWorking, File dirBuild, String jarName) {
+        LOG.info("Package into jar");
+
+        try {
+            File dirJars = getDirectoryForJars(dirWorking);
+
+            if (dirJars.exists() || dirJars.mkdir()) {
+                String argDashC = String.format("-C %s", dirBuild.getAbsolutePath());
+                String cmd = String.join(" ", new String[] {
+                    "jar cvfm"
+                    , String.format("%s/%s.jar", dirJars.getAbsolutePath(), jarName)
+                    , String.format("%s/META-INF/MANIFEST.MF", dirBuild.getAbsolutePath())
+                    , argDashC, "org"
+                    , argDashC, "org/onap/dcae/genprocessor"
+                    , argDashC, "META-INF"
+                });
+                LOG.debug(String.format("Jar command: %s", cmd));
+
+                if (Runtime.getRuntime().exec(cmd).waitFor() == 0) {
+                    return true;
+                }
+            }
+        } catch (InterruptedException e) {
+            throw new RuntimeException("Error while creating jar", e);
+        } catch (IOException e) {
+            throw new RuntimeException("Error while creating jar", e);
+        }
+
+        return false;
+    }
+
+    private static boolean doesJarExist(File dirWorking, String jarName) {
+        File dirJars = getDirectoryForJars(dirWorking);
+        String[] jars = dirJars.list(new FilenameFilter() {
+            @Override
+            public boolean accept(File dir, String name) {
+                return name.contains(jarName);
+            }
+        });
+        return jars.length > 0;
+    }
+
+    /**
+     * Looks for the MANIFEST.MF and extracts-to-print expected values (group, id,
+     * version)
+     * 
+     * @param classLoader
+     */
+    private static void checkManifest(ClassLoader classLoader) {
+        try {
+            URL url = ((URLClassLoader) classLoader).findResource("META-INF/MANIFEST.MF");
+            Manifest manifest = new Manifest(url.openStream());
+
+            final Attributes attributes = manifest.getMainAttributes();
+            final String group = attributes.getValue("Group");
+            final String id = attributes.getValue("Id");
+            final String version = attributes.getValue("Version");
+            LOG.info(String.format("group=%s, id=%s, version=%s", group, id, version));
+        } catch (IOException e) {
+            throw new RuntimeException("Error while reading manifest", e);
+        }
+    }
+
+    /**
+     * Given a URL to a index.json file, fetches the file and generates a list of
+     * URLs for DCAE jars that has Processors packaged.
+     * 
+     * @param indexDCAEJars
+     * @return
+     */
+    public static List<URL> getDCAEJarsURLs(URI indexDCAEJars) {
+        JsonFactory jf = new JsonFactory();
+        ObjectMapper om = new ObjectMapper();
+
+        try {
+            List<Object> urls = om.readValue(jf.createParser(indexDCAEJars.toURL()), List.class);
+
+            return urls.stream().map(u -> {
+                try {
+                    Map<String, Object> foo = (Map<String, Object>) u;
+                    String name = (String) foo.get("name");
+                    String url = String.format("%s/%s", indexDCAEJars.toString(), name);
+                    return new URL(url);
+                } catch (MalformedURLException e) {
+                    // Hopefully you never come here...
+                    return null;
+                }
+            }).collect(Collectors.toList());
+        } catch (Exception e) {
+            throw new RuntimeException("Error while getting jar URIs", e);
+        }
+    }
+
+    /**
+     * Loads all the Processor classes from the list of jar URLs and does a
+     * validation check that prints to screen.
+     * 
+     * @param jarURLs
+     */
+    public static void loadFromJars(URL[] jarURLs) {
+        URLClassLoader urlClassLoader = new URLClassLoader(jarURLs);
+        checkManifest(urlClassLoader);
+
+        final ServiceLoader<?> serviceLoader = ServiceLoader.load(Processor.class, urlClassLoader);
+
+        for (final Object o : serviceLoader) {
+            LOG.info(o.getClass().getName());
+            DCAEProcessor proc = ((DCAEProcessor) o);
+            proc.ping();
+            LOG.info(String.format("%s: %s", proc.getName(), proc.getComponentUrl()));
+        }
+
+        // TODO: Can fetch the comp spec with the component url to do further
+        // validation..
+    }
+
+    private static boolean init(File dirWorking) {
+        File dirJars = getDirectoryForJars(dirWorking);
+
+        if (dirJars.exists() || dirJars.mkdirs()) {
+            return true;
+        }
+
+        return false;
+    }
+
+    public static void main(String[] args) {
+        if (args.length == 0) {
+            LOG.info("Here are the possible args:");
+            LOG.info("<gen> <load>");
+        }
+
+        String argsStr = String.join(", ", args);
+        boolean shouldGenerate = argsStr.contains("gen") ? true : false;
+        boolean shouldLoad = argsStr.contains("load") ? true : false;
+        boolean shouldPackage = argsStr.contains("package") ? true : false;
+
+        // Config from env variables
+        File dirWorking = new File(System.getenv("GENPROC_WORKING_DIR"));
+        String hostOnboardingAPI = System.getenv("GENPROC_ONBOARDING_API_HOST");
+        File processorClassFile = new File(System.getenv("GENPROC_PROCESSOR_CLASSFILE_PATH"));
+        String urlToJarIndex = System.getenv("GENPROC_JAR_INDEX_URL");
+
+        String[] paramsToPrint = new String[] {
+            String.format("shouldGenerate=%b", shouldGenerate)
+            , String.format("shouldLoad=%b", shouldLoad)
+            , String.format("Working directory=%s", dirWorking.getName())
+        };
+        LOG.info(String.format("Genprocessor configuration: \n\t%s",
+            String.join("\n\t", paramsToPrint)));
+
+        init(dirWorking);
+
+        // TODO: Need a way to load from file again
+
+        if (shouldGenerate) {
+            CompList compList = OnboardingAPIClient.getComponents(hostOnboardingAPI);
+            LOG.info(String.format("Components retrieved: %d", compList.components.size()));
+
+            for (CompList.CompShort cs : compList.components) {
+                Comp comp = OnboardingAPIClient.getComponent(cs.getComponentUrlAsURI());
+                LOG.info(String.format("Component spec: \n\t%s", comp.compSpec.toString("\n\t")));
+
+                String jarName = Utils.formatNameForJar(comp.compSpec);
+
+                if (doesJarExist(dirWorking, jarName)) {
+                    LOG.info(String.format("Jar exists: %s.jar", jarName));
+                    continue;
+                }
+
+                File dirBuild = new File(dirWorking, jarName);
+
+                if (dirBuild.exists() || dirBuild.mkdir()) {
+                    generateClassFile(dirBuild.getAbsolutePath(), comp);
+                    writeManifestThing(dirBuild, generateManifestMF(comp.compSpec), "META-INF", "MANIFEST.MF");
+                    writeManifestThing(dirBuild, Arrays.asList(createClassName(comp.compSpec)), "META-INF/services",
+                            "org.apache.nifi.processor.Processor");
+                    copyProcessorClassFile(processorClassFile, dirBuild);
+                    packageJar(dirWorking, dirBuild, jarName);
+                }
+            }
+        }
+
+        if (shouldLoad) {
+            List<URL> jarURLs;
+            try {
+                jarURLs = getDCAEJarsURLs(new URI(urlToJarIndex));
+                LOG.info(jarURLs.toString());
+            } catch (URISyntaxException e) {
+                throw new RuntimeException("URL to index.json is bad");
+            }
+
+            for (URL jarURL : jarURLs) {
+                loadFromJars(new URL[] {jarURL});
+            }
+        }
+    }
+}
diff --git a/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/Comp.java b/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/Comp.java
new file mode 100644
index 0000000..69d8776
--- /dev/null
+++ b/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/Comp.java
@@ -0,0 +1,35 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.dcae.genprocessor;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class Comp {
+
+    @JsonProperty("id")
+    public String id;
+
+    @JsonProperty("spec")
+    public CompSpec compSpec;
+
+    @JsonProperty("selfUrl")
+    public String selfUrl;
+
+}
\ No newline at end of file
diff --git a/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/CompList.java b/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/CompList.java
new file mode 100644
index 0000000..fcf25b4
--- /dev/null
+++ b/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/CompList.java
@@ -0,0 +1,70 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.dcae.genprocessor;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.List;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class CompList {
+
+    static final Logger LOG = LoggerFactory.getLogger(CompList.class);
+
+    @JsonIgnoreProperties(ignoreUnknown = true)
+    public static class CompShort {
+        @JsonProperty("id")
+        public String id;
+        @JsonProperty("name")
+        public String name;
+        @JsonProperty("version")
+        public String version;
+        @JsonProperty("description")
+        public String description;
+        @JsonProperty("componentType")
+        public String componentType;
+        @JsonProperty("owner")
+        public String owner;
+        @JsonProperty("componentUrl")
+        public String componentUrl;
+        @JsonProperty("whenAdded")
+        public String whenAdded;
+
+        public String getNameForJavaClass() {
+            return Utils.formatNameForJavaClass(this.name);
+        }
+
+        public URI getComponentUrlAsURI() {
+            try {
+                return new URI(this.componentUrl);
+            } catch (URISyntaxException e) {
+                throw new RuntimeException("Component URL is bad");
+            }
+        }
+    }
+
+    @JsonProperty("components")
+    public List<CompShort> components;
+
+}
diff --git a/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/CompSpec.java b/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/CompSpec.java
new file mode 100644
index 0000000..34b7398
--- /dev/null
+++ b/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/CompSpec.java
@@ -0,0 +1,144 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.dcae.genprocessor;
+
+import java.io.File;
+import java.net.URI;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.core.JsonFactory;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class CompSpec {
+
+    static final Logger LOG = LoggerFactory.getLogger(App.class);
+
+    public String name;
+    // Name of component to be transformed to be more Java style
+    public String nameJavaClass;
+    public String version;
+    public String description;
+
+    // https://stackoverflow.com/questions/37010891/how-to-map-a-nested-value-to-a-property-using-jackson-annotations
+    @JsonProperty("self")
+    public void unpackSelf(Map<String, String> self) {
+        this.name = self.get("name");
+        this.nameJavaClass = Utils.formatNameForJavaClass(self.get("name"));
+        this.version = self.get("version");
+        this.description = self.get("description");
+    }
+
+
+    @JsonIgnoreProperties(ignoreUnknown = true)
+    public static class Parameter {
+        @JsonProperty("name")
+        public String name;
+        @JsonProperty("value")
+        public String value;
+        @JsonProperty("description")
+        public String description;
+        @JsonProperty("sourced_at_deployment")
+        public boolean sourcedAtDeployment;
+        @JsonProperty("policy_editable")
+        public boolean policyEditable;
+        @JsonProperty("designer_editable")
+        public boolean designerEditable;
+
+        public String toString() {
+            String[] params = new String[] {
+                String.format("name: \"%s\"", this.name)
+                , String.format("value: \"%s\"", this.value)
+                , String.format("description: \"%s\"", this.description)
+            };
+            return String.join(", ", params);
+        }
+    }
+
+    @JsonProperty("parameters")
+    public List<Parameter> parameters;
+
+    @JsonIgnoreProperties(ignoreUnknown = true)
+    public static class Connection {
+        @JsonProperty("format")
+        public String format;
+        @JsonProperty("version")
+        public String version;
+        @JsonProperty("type")
+        public String type;
+        @JsonProperty("config_key")
+        public String configKey;
+    }
+
+    @JsonProperty("streams")
+    public Map<String, List<Connection>> streams;
+
+    public List<Connection> getPublishes() {
+        return streams.containsKey("publishes") ? streams.get("publishes") : null;
+    }
+
+    public List<Connection> getSubscribes() {
+        return streams.containsKey("subscribes") ? streams.get("subscribes") : null;
+    }
+
+    public String toString(String delimiter) {
+        List<String> items = new ArrayList();
+        items.add(String.format("name: %s", name));
+        items.add(String.format("version: %s", version));
+        items.add(String.format("description: %s", description));
+        items.add(String.format("parameters: %d", parameters.size()));
+
+        if (!parameters.isEmpty()) {
+            // Cap at MAX
+            int MAX=parameters.size() > 3 ? 3 : parameters.size();
+            for (int i=0; i<MAX; i++) {
+                items.add(String.format("\t%s", parameters.get(i).toString()));
+            }
+        }
+
+        items.add("\t..");
+
+        return String.join(delimiter, items.toArray(new String[items.size()]));
+    }
+
+    public static CompSpec loadComponentSpec(File compSpecFile) {
+        return loadComponentSpec(compSpecFile.toURI());
+    }
+
+    public static CompSpec loadComponentSpec(URI compSpecURI) {
+        JsonFactory jf = new JsonFactory();
+        ObjectMapper om = new ObjectMapper();
+
+        try {
+            return om.readValue(jf.createParser(compSpecURI.toURL()), CompSpec.class);
+        } catch (Exception e) {
+            LOG.error("Uhoh", e);
+        }
+
+        throw new RuntimeException("REPLACE ME");
+    }
+
+}
diff --git a/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/DCAEProcessor.java b/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/DCAEProcessor.java
new file mode 100644
index 0000000..b920b90
--- /dev/null
+++ b/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/DCAEProcessor.java
@@ -0,0 +1,92 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.dcae.genprocessor;
+
+import java.util.List;
+import java.util.Set;
+
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.processor.AbstractProcessor;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.ProcessSession;
+import org.apache.nifi.processor.Relationship;
+import org.apache.nifi.processor.exception.ProcessException;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+
+public abstract class DCAEProcessor extends AbstractProcessor {
+
+    static final Logger LOG = LoggerFactory.getLogger(DCAEProcessor.class);
+
+    // These are properties of the DCAE component that may be useful in the future..
+    abstract public String getName();
+    abstract public String getVersion();
+    abstract public String getComponentId();
+    abstract public String getComponentUrl();
+
+    public void ping() {
+        LOG.info("pong");
+    }
+
+    @Override
+    public void onTrigger(ProcessContext arg0, ProcessSession arg1) throws ProcessException {
+        LOG.info("Bang you triggered DCAEProcessor!");
+        return;
+    }
+
+    /**
+     * This function gets implemented by the ProcessorBuilder magic to build a new custom list of
+     * PropertyDescriptor every time. This is to be used by getSupportedPropertyDescriptors() which
+     * *should* only call this method once to initially fill the cache.
+     * 
+     * @return list of PropertyDescriptor
+     */
+    abstract protected List<PropertyDescriptor> buildSupportedPropertyDescriptors();
+
+    // Cache of PropertyDescriptors which should be static
+    private List<PropertyDescriptor> properties;
+
+    /**
+     * This is the critical Nifi function that is used to populate the configuration parameters
+     * in the UI and drive all the other configuration related functions in the ConfigurableComponent
+     * base class
+     */
+    @Override
+    protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
+        if (this.properties == null) {
+            this.properties = buildSupportedPropertyDescriptors();
+        }
+        return this.properties;
+    }
+
+    abstract protected Set<Relationship> buildRelationships();
+
+    // Cache of Relationships which should be static
+    private Set<Relationship> relationships;
+
+    @Override
+    public Set<Relationship> getRelationships() {
+        if (this.relationships == null) {
+            this.relationships = buildRelationships();
+        }
+        return this.relationships;
+    }
+
+}
\ No newline at end of file
diff --git a/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/OnboardingAPIClient.java b/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/OnboardingAPIClient.java
new file mode 100644
index 0000000..12c3726
--- /dev/null
+++ b/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/OnboardingAPIClient.java
@@ -0,0 +1,65 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.dcae.genprocessor;
+
+import java.net.URI;
+
+import com.fasterxml.jackson.core.JsonFactory;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class OnboardingAPIClient {
+
+    static final Logger LOG = LoggerFactory.getLogger(OnboardingAPIClient.class);
+
+    public static CompList getComponents(String hostOnboardingAPI) {
+        JsonFactory jf = new JsonFactory();
+        ObjectMapper om = new ObjectMapper();
+
+        try {
+            URI uri = new URI(hostOnboardingAPI + "/components");
+            return om.readValue(jf.createParser(uri.toURL()), CompList.class);
+        } catch (Exception e) {
+            String message = "Error while pulling components from onboarding API";
+            LOG.error(message, e);
+            throw new OnboardingAPIClientError(message, e);
+        }
+    }
+
+    public static Comp getComponent(URI componentUri) {
+        JsonFactory jf = new JsonFactory();
+        ObjectMapper om = new ObjectMapper();
+
+        try {
+            return om.readValue(jf.createParser(componentUri.toURL()), Comp.class);
+        } catch (Exception e) {
+            String message = "Error while pulling component from onboarding API";
+            LOG.error(message, e);
+            throw new OnboardingAPIClientError(message, e);
+        }
+    }
+
+    public static class OnboardingAPIClientError extends RuntimeException {
+        public OnboardingAPIClientError(String message, Throwable exception) {
+            super(message, exception);
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/ProcessorBuilder.java b/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/ProcessorBuilder.java
new file mode 100644
index 0000000..ca87bda
--- /dev/null
+++ b/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/ProcessorBuilder.java
@@ -0,0 +1,195 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.dcae.genprocessor;
+
+import javassist.CannotCompileException;
+import javassist.CtClass;
+import javassist.CtMethod;
+import javassist.bytecode.AnnotationsAttribute;
+import javassist.bytecode.ClassFile;
+import javassist.bytecode.ConstPool;
+import javassist.bytecode.annotation.Annotation;
+import javassist.bytecode.annotation.ArrayMemberValue;
+import javassist.bytecode.annotation.MemberValue;
+import javassist.bytecode.annotation.StringMemberValue;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import org.apache.commons.text.StringEscapeUtils;
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.Tags;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class ProcessorBuilder {
+
+    static final Logger LOG = LoggerFactory.getLogger(ProcessBuilder.class);
+
+    public static class ProcessorBuilderError extends RuntimeException {
+        public ProcessorBuilderError(Throwable e) {
+            super("Error while generating DCAEProcessor", e);
+        }
+    }
+
+    private static Annotation createAnnotationDescription(String description, ConstPool constPool) {
+        // https://www.codota.com/code/java/packages/javassist.bytecode showed me that
+        // the constructor
+        // adds a UTF8 object thing so I'm guessing that the index value when doing
+        // addMemberValue
+        // should match that of the newly added object otherwise you get a nullpointer
+        Annotation annDescrip = new Annotation(CapabilityDescription.class.getName(), constPool);
+        // Tried to use the index version of addMemberValue with index of
+        // constPool.getSize()-1
+        // but didn't work
+        annDescrip.addMemberValue("value", new StringMemberValue(description, constPool));
+        return annDescrip;
+    }
+
+    private static Annotation createAnnotationTags(String[] tags, ConstPool constPool) {
+        Annotation annTags = new Annotation(Tags.class.getName(), constPool);
+        ArrayMemberValue mv = new ArrayMemberValue(constPool);
+
+        List<MemberValue> elements = new ArrayList<MemberValue>();
+        for (String tag : tags) {
+            elements.add(new StringMemberValue(tag, constPool));
+        }
+
+        mv.setValue(elements.toArray(new MemberValue[elements.size()]));
+        // Tried to use the index version of addMemberValue with index of
+        // constPool.getSize()-1
+        // but didn't work
+        annTags.addMemberValue("value", mv);
+        return annTags;
+    }
+
+    public static String[] createTags(CompSpec compSpec) {
+        List<String> tags = new ArrayList<>();
+        tags.add("DCAE");
+
+        // TODO: Need to source type from spec
+        if (compSpec.name.toLowerCase().contains("collector")) {
+            tags.add("collector");
+        }
+
+        if (!compSpec.getPublishes().isEmpty()) {
+            tags.add("publisher");
+        }
+
+        if (!compSpec.getSubscribes().isEmpty()) {
+            tags.add("subscriber");
+        }
+
+        String[] tagArray = new String[tags.size()];
+        return tags.toArray(tagArray);
+    }
+
+    public static void addAnnotationsProcessor(CtClass target, String description, String[] tags) {
+        ClassFile ccFile = target.getClassFile();
+        ConstPool constPool = ccFile.getConstPool();
+
+        AnnotationsAttribute attr = new AnnotationsAttribute(constPool, AnnotationsAttribute.visibleTag);
+        attr.addAnnotation(createAnnotationDescription(description, constPool));
+        attr.addAnnotation(createAnnotationTags(tags, constPool));
+
+        ccFile.addAttribute(attr);
+    }
+
+    private static void addMethod(CtClass target, String methodCode) {
+        try {
+            CtMethod method = CtMethod.make(methodCode, target);
+            target.addMethod(method);
+        } catch (CannotCompileException e) {
+            LOG.error(String.format("Issue with this code:\n%s", methodCode));
+            LOG.error(e.toString(), e);
+            throw new ProcessorBuilderError(e);
+        }
+    }
+
+    private static String createCodeGetter(String methodName, String returnValue) {
+        return String.format("public java.lang.String get%s() { return \"%s\"; }", methodName, returnValue);
+    }
+
+    public static void setComponentPropertyGetters(CtClass target, Comp comp) {
+        addMethod(target, createCodeGetter("Name", comp.compSpec.name));
+        addMethod(target, createCodeGetter("Version", comp.compSpec.version));
+        addMethod(target, createCodeGetter("ComponentId", comp.id));
+        addMethod(target, createCodeGetter("ComponentUrl", comp.selfUrl));
+    }
+
+    private static String convertParameterToCode(CompSpec.Parameter param) {
+        StringBuilder sb = new StringBuilder("props.add(new org.apache.nifi.components.PropertyDescriptor.Builder()");
+        sb.append(String.format(".name(\"%s\")", param.name));
+        sb.append(String.format(".displayName(\"%s\")", param.name));
+        sb.append(String.format(".description(\"%s\")", StringEscapeUtils.escapeJava(param.description)));
+        sb.append(String.format(".defaultValue(\"%s\")", StringEscapeUtils.escapeJava(param.value)));
+        sb.append(".build());");
+        return sb.toString();
+    }
+
+    private static String createCodePropertyDescriptors(CompSpec compSpec) {
+        List<String> linesParams = compSpec.parameters.stream().map(p -> convertParameterToCode(p)).collect(Collectors.toList());
+
+        // NOTE: Generics are only partially supported https://www.javassist.org/tutorial/tutorial3.html#generics
+        String[] lines = new String[] {"protected java.util.List buildSupportedPropertyDescriptors() {"
+            , "java.util.List props = new java.util.LinkedList();"
+            , String.join("\n", linesParams.toArray(new String[linesParams.size()]))
+            , "return props; }"
+        };
+
+        return String.join("\n", lines);
+    }
+
+    public static void setProcessorPropertyDescriptors(CtClass target, CompSpec compSpec) {
+        addMethod(target, createCodePropertyDescriptors(compSpec));
+    }
+
+    private static String createRelationshipName(CompSpec.Connection connection, String direction) {
+        // TODO: Revisit this name thing ugh
+        return String.format("%s:%s:%s:%s:%s",
+            direction, connection.format.toLowerCase(), connection.version, connection.type, connection.configKey);
+    }
+
+    private static String convertConnectionToCode(CompSpec.Connection connection, String direction) {
+        StringBuilder sb = new StringBuilder("rels.add(new org.apache.nifi.processor.Relationship.Builder()");
+        sb.append(String.format(".name(\"%s\")", createRelationshipName(connection, direction)));
+        sb.append(".build());");
+        return sb.toString();
+    }
+
+    private static String createCodeRelationships(CompSpec compSpec) {
+        List<String> linesPubs = compSpec.getPublishes().stream().map(c -> convertConnectionToCode(c, "publishes")).collect(Collectors.toList());
+        List<String> linesSubs = compSpec.getSubscribes().stream().map(c -> convertConnectionToCode(c, "subscribes")).collect(Collectors.toList());
+
+        String [] lines = new String[] {"protected java.util.Set buildRelationships() {"
+            , "java.util.Set rels = new java.util.HashSet();"
+            , String.join("\n", linesPubs.toArray(new String[linesPubs.size()]))
+            , String.join("\n", linesSubs.toArray(new String[linesSubs.size()]))
+            , "return rels; }"
+        };
+
+        return String.join("\n", lines);
+    }
+
+    public static void setProcessorRelationships(CtClass target, CompSpec compSpec) {
+        addMethod(target, createCodeRelationships(compSpec));
+    }
+
+}
\ No newline at end of file
diff --git a/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/Utils.java b/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/Utils.java
new file mode 100644
index 0000000..9a7c50a
--- /dev/null
+++ b/mod/genprocessor/src/main/java/org/onap/dcae/genprocessor/Utils.java
@@ -0,0 +1,44 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.dcae.genprocessor;
+
+public class Utils {
+
+    /**
+     * Make a name like this "dcae-ves-collector" to "DcaeVesCollector"
+     * 
+     * @param name
+     * @return
+     */
+    public static String formatNameForJavaClass(String name) {
+        // From the sample of 134 specs, 79 had dashes and 102 had dots which means some
+        // had both
+        String[] segments = name.split("[\\-\\.]");
+
+        for (int i=0; i<segments.length; i++) {
+            segments[i] = segments[i].substring(0, 1).toUpperCase() + segments[i].substring(1);
+        }
+
+        return String.join("", segments);
+    }
+
+    public static String formatNameForJar(CompSpec compSpec) {
+        return String.format("%s-%s", compSpec.name, compSpec.version);
+    }
+
+}
\ No newline at end of file
diff --git a/mod/genprocessor/src/main/resources/logback.xml b/mod/genprocessor/src/main/resources/logback.xml
new file mode 100644
index 0000000..fdd8cf0
--- /dev/null
+++ b/mod/genprocessor/src/main/resources/logback.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+
+  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+    <layout class="ch.qos.logback.classic.PatternLayout">
+      <Pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</Pattern>
+    </layout>
+  </appender>
+  
+  <logger name="sandbox" level="TRACE"/>
+  
+
+  <root level="debug">
+    <appender-ref ref="STDOUT" />
+  </root>
+</configuration>
\ No newline at end of file
diff --git a/mod/genprocessor/src/test/java/sandbox/AppTest.java b/mod/genprocessor/src/test/java/sandbox/AppTest.java
new file mode 100644
index 0000000..3ce8f1a
--- /dev/null
+++ b/mod/genprocessor/src/test/java/sandbox/AppTest.java
@@ -0,0 +1,37 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package sandbox;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+/**
+ * Unit test for simple App.
+ */
+public class AppTest 
+{
+    /**
+     * Rigorous Test :-)
+     */
+    @Test
+    public void shouldAnswerWithTrue()
+    {
+        assertTrue( true );
+    }
+}