Proposal to remove OSGi dependencies from the CCSDK project

Dependencies on the OSGi frameworks and libraries are removed
by integrating the CCSDK project with the lighty.io.
It's a toolkit that allows to use ODL services (in this case
core services and the Restconf) without the dependency
on the Karaf framework and the Blueprint DI.

In this change are created the lighty.io modules which
initialize and expose same services as the Blueprint DI in
the blueprint.xml files.

More info about the lighty.io - https://lighty.io

Change-Id: I38171e83b018a18bfd8eaec95d4dc2fa2e3f5b36
Signed-off-by: Matej Perina <matej.perina@pantheon.tech>
Signed-off-by: Samuel Kontris <samuel.kontris@pantheon.tech>

3 files changed, 264 insertions, 0 deletions

diff --git a/lighty/ccsdk-core-lighty/pom.xml b/lighty/ccsdk-core-lighty/pom.xml
new file mode 100755
index 00000000..24c03cc2
--- /dev/null
+++ b/lighty/ccsdk-core-lighty/pom.xml
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+
+	<groupId>org.onap.ccsdk.sli.core</groupId>
+	<artifactId>ccsdk-core-lighty</artifactId>
+	<version>0.6.0-SNAPSHOT</version>
+	<packaging>jar</packaging>
+
+	<properties>
+		<maven.compiler.source>1.8</maven.compiler.source>
+		<maven.compiler.target>1.8</maven.compiler.target>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.onap.ccsdk.sli.core</groupId>
+			<artifactId>dblib-lighty</artifactId>
+			<version>${project.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>org.onap.ccsdk.sli.core</groupId>
+			<artifactId>sli-lighty</artifactId>
+			<version>${project.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>org.onap.ccsdk.sli.core</groupId>
+			<artifactId>sliapi-lighty</artifactId>
+			<version>${project.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>org.onap.ccsdk.sli.core</groupId>
+			<artifactId>sliPluginUtil-lighty</artifactId>
+			<version>${project.version}</version>
+		</dependency>
+	</dependencies>
+</project>
diff --git a/lighty/ccsdk-core-lighty/src/main/java/org/onap/ccsdk/sli/core/lighty/CcsdkCoreLightyModule.java b/lighty/ccsdk-core-lighty/src/main/java/org/onap/ccsdk/sli/core/lighty/CcsdkCoreLightyModule.java
new file mode 100644
index 00000000..578d1824
--- /dev/null
+++ b/lighty/ccsdk-core-lighty/src/main/java/org/onap/ccsdk/sli/core/lighty/CcsdkCoreLightyModule.java
@@ -0,0 +1,148 @@
+/*
+ * ============LICENSE_START==========================================
+ * Copyright (c) 2019 PANTHEON.tech s.r.o.
+ * ===================================================================
+ * 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.ccsdk.sli.core.lighty;
+
+import io.lighty.core.controller.api.AbstractLightyModule;
+import org.onap.ccsdk.sli.core.dblib.lighty.DblibModule;
+import org.onap.ccsdk.sli.core.lighty.common.CcsdkLightyUtils;
+import org.onap.ccsdk.sli.core.sli.SvcLogicAdaptor;
+import org.onap.ccsdk.sli.core.sli.SvcLogicJavaPlugin;
+import org.onap.ccsdk.sli.core.sli.SvcLogicRecorder;
+import org.onap.ccsdk.sli.core.sli.SvcLogicResource;
+import org.onap.ccsdk.sli.core.sli.lighty.SliModule;
+import org.onap.ccsdk.sli.core.sliapi.lighty.SliApiModule;
+import org.onap.ccsdk.sli.core.slipluginutils.lighty.SliPluginUtilsModule;
+import org.opendaylight.aaa.encrypt.AAAEncryptionService;
+import org.opendaylight.controller.md.sal.binding.api.DataBroker;
+import org.opendaylight.controller.md.sal.binding.api.NotificationPublishService;
+import org.opendaylight.controller.sal.binding.api.RpcProviderRegistry;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * The implementation of the {@link io.lighty.core.controller.api.LightyModule} that groups all other LightyModules
+ * from the ccsdk-sli-core repository so they can be all treated as one component (for example started/stopped at once).
+ * For more information about the lighty.io visit the website https://lighty.io.
+ */
+public class CcsdkCoreLightyModule extends AbstractLightyModule {
+
+    private static final Logger LOG = LoggerFactory.getLogger(CcsdkCoreLightyModule.class);
+
+    private final DataBroker dataBroker;
+    private final NotificationPublishService notificationPublishService;
+    private final RpcProviderRegistry rpcProviderRegistry;
+    private final AAAEncryptionService aaaEncryptionService;
+    private final SvcLogicResource svcLogicResource;
+    private final SvcLogicRecorder svcLogicRecorder;
+    private final SvcLogicJavaPlugin svcLogicJavaPlugin;
+    private final SvcLogicAdaptor svcLogicAdaptor;
+
+    private DblibModule dblibModule;
+    private SliModule sliModule;
+    private SliApiModule sliApiModule;
+    private SliPluginUtilsModule sliPluginUtilsModule;
+
+    // FIXME cyclic dependency - implementation of SvcLogicResource is located in adaptors and CcsdkAdaptorsLightyModule
+    //  is depencent on DbLibService from core
+    public CcsdkCoreLightyModule(DataBroker dataBroker, NotificationPublishService notificationPublishService,
+            RpcProviderRegistry rpcProviderRegistry, AAAEncryptionService aaaEncryptionService,
+            SvcLogicResource svcLogicResource, SvcLogicRecorder svcLogicRecorder, SvcLogicJavaPlugin svcLogicJavaPlugin,
+            SvcLogicAdaptor svcLogicAdaptor) {
+        this.dataBroker = dataBroker;
+        this.notificationPublishService = notificationPublishService;
+        this.rpcProviderRegistry = rpcProviderRegistry;
+        this.aaaEncryptionService = aaaEncryptionService;
+        this.svcLogicResource = svcLogicResource;
+        this.svcLogicRecorder = svcLogicRecorder;
+        this.svcLogicJavaPlugin = svcLogicJavaPlugin;
+        this.svcLogicAdaptor = svcLogicAdaptor;
+    }
+
+    protected boolean initProcedure() {
+        LOG.debug("Initializing CCSDK Core Lighty module...");
+
+        this.dblibModule = new DblibModule(aaaEncryptionService);
+        if (!CcsdkLightyUtils.startLightyModule(dblibModule)) {
+            return false;
+        }
+
+        this.sliModule = new SliModule(dblibModule.getDbLibService(), svcLogicResource, svcLogicRecorder,
+                svcLogicJavaPlugin, svcLogicAdaptor);
+        if (!CcsdkLightyUtils.startLightyModule(sliModule)) {
+            return false;
+        }
+
+        this.sliApiModule = new SliApiModule(dataBroker, notificationPublishService, rpcProviderRegistry, sliModule.getSvcLogicServiceImpl());
+        if (!CcsdkLightyUtils.startLightyModule(sliApiModule)) {
+            return false;
+        }
+
+        this.sliPluginUtilsModule = new SliPluginUtilsModule();
+        if (!CcsdkLightyUtils.startLightyModule(sliPluginUtilsModule)) {
+            return false;
+        }
+
+        LOG.debug("CCSDK Core Lighty module was initialized successfully");
+        return true;
+    }
+
+    protected boolean stopProcedure() {
+        LOG.debug("Stopping CCSDK Core Lighty module...");
+
+        boolean stopSuccessful = true;
+
+        if (!CcsdkLightyUtils.stopLightyModule(sliPluginUtilsModule)) {
+            stopSuccessful = false;
+        }
+
+        if (!CcsdkLightyUtils.stopLightyModule(sliApiModule)) {
+            stopSuccessful = false;
+        }
+
+        if (!CcsdkLightyUtils.stopLightyModule(sliModule)) {
+            stopSuccessful = false;
+        }
+
+        if (!CcsdkLightyUtils.stopLightyModule(dblibModule)) {
+            stopSuccessful = false;
+        }
+
+        if (stopSuccessful) {
+            LOG.debug("CCSDK Core Lighty module was stopped successfully");
+        } else {
+            LOG.error("CCSDK Core Lighty module was not stopped successfully!");
+        }
+        return stopSuccessful;
+    }
+
+    public DblibModule getDblibModule() {
+        return dblibModule;
+    }
+
+    public SliModule getSliModule() {
+        return sliModule;
+    }
+
+    public SliApiModule getSliApiModule() {
+        return sliApiModule;
+    }
+
+    public SliPluginUtilsModule getSliPluginUtilsModule() {
+        return sliPluginUtilsModule;
+    }
+}
diff --git a/lighty/ccsdk-core-lighty/src/main/java/org/onap/ccsdk/sli/core/lighty/common/CcsdkLightyUtils.java b/lighty/ccsdk-core-lighty/src/main/java/org/onap/ccsdk/sli/core/lighty/common/CcsdkLightyUtils.java
new file mode 100644
index 00000000..bfbcb135
--- /dev/null
+++ b/lighty/ccsdk-core-lighty/src/main/java/org/onap/ccsdk/sli/core/lighty/common/CcsdkLightyUtils.java
@@ -0,0 +1,78 @@
+/*
+ * ============LICENSE_START==========================================
+ * Copyright (c) 2019 PANTHEON.tech s.r.o.
+ * ===================================================================
+ * 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.ccsdk.sli.core.lighty.common;
+
+import io.lighty.core.controller.api.LightyModule;
+import java.util.concurrent.ExecutionException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Utils class containing methods to start/stop LightyModules easier.
+ */
+public class CcsdkLightyUtils {
+
+    private static final Logger LOG = LoggerFactory.getLogger(CcsdkLightyUtils.class);
+
+    private CcsdkLightyUtils() {
+        throw new IllegalStateException("This class should not be instantiated!");
+    }
+
+    /**
+     * Starts provided LightyModule
+     * @param lightyModule LightyModule to start
+     * @return true if start was successful; false otherwise
+     */
+    public static boolean startLightyModule(LightyModule lightyModule) {
+        LOG.debug("Starting Lighty module: {} ...", lightyModule.getClass());
+        try {
+            if (lightyModule.start().get()) {
+                LOG.debug("Lighty module: {} was started successfully", lightyModule.getClass());
+                return true;
+            } else {
+                LOG.error("Unable to start Lighty Module: {}!", lightyModule.getClass());
+                return false;
+            }
+        } catch (InterruptedException | ExecutionException e) {
+            LOG.error("Exception thrown while initializing Lighty Module: {}!", lightyModule.getClass(), e);
+            return false;
+        }
+    }
+
+    /**
+     * Stops provided LightyModule
+     * @param lightyModule LightyModule to stop
+     * @return true if stop was successful; false otherwise
+     */
+    public static boolean stopLightyModule(LightyModule lightyModule) {
+        LOG.debug("Stopping Lighty Module: {}...", lightyModule.getClass());
+        try {
+            if (lightyModule.shutdown().get()) {
+                LOG.debug("Lighty Module: {} was stopped successfully", lightyModule.getClass());
+                return true;
+            } else {
+                LOG.error("Unable to stop Lighty Module: {}!", lightyModule.getClass());
+                return false;
+            }
+        } catch (Exception e) {
+            LOG.error("Exception thrown while shutting down {} in CCSDK Core Lighty module!", lightyModule.getClass(),
+                    e);
+            return false;
+        }
+    }
+}