Fetch configuration from CBS

- Fix memory leak.
- Add reactive configuration fetching from Consul. Now configuration is updated when any change in VES configuration has been done in Consul.

Change-Id: I9cd42e04844c9e99d4d03951185523b569dc9483
Issue-ID: DCAEGEN2-2495
Signed-off-by: Zebek Bogumil <bogumil.zebek@nokia.com>
(cherry picked from commit 1599617246f0ffec1b1c7840f9c7c42318183dcd)

1 files changed, 85 insertions, 0 deletions

diff --git a/src/main/java/org/onap/dcae/configuration/cbs/CbsClientConfigurationProvider.java b/src/main/java/org/onap/dcae/configuration/cbs/CbsClientConfigurationProvider.java
new file mode 100644
index 00000000..fc88197c
--- /dev/null
+++ b/src/main/java/org/onap/dcae/configuration/cbs/CbsClientConfigurationProvider.java
@@ -0,0 +1,85 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.ves
+ * ================================================================================
+ * Copyright (C) 2020 Nokia. 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.configuration.cbs;
+
+import org.jetbrains.annotations.NotNull;
+import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.model.CbsClientConfiguration;
+import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.model.ImmutableCbsClientConfiguration;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * CbsClientConfigurationProvider is used to provide production or dev configuration for CBS client.
+ */
+public class CbsClientConfigurationProvider {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(CbsClientConfigurationProvider.class);
+
+    private static final String DEFAULT_PROTOCOL = "http";
+    private static final String DEFAULT_HOSTNAME = "config-binding-service";
+    private static final int DEFAULT_PORT = 10000;
+    private static final String DEFAULT_APP_NAME = "dcae-ves-collector";
+    private static final String DEV_MODE_PROPERTY = "devMode";
+    private static final String CBS_PORT_PROPERTY = "cbsPort";
+
+    /**
+     * Returns configuration for CBS client.
+     * @return Production or dev configuration for CBS client, depends on application run arguments.
+     */
+    public CbsClientConfiguration get() {
+        try {
+            if (isDevModeEnabled()) {
+                return getDevConfiguration();
+            } else {
+                return CbsClientConfiguration.fromEnvironment();
+            }
+        } catch (Exception e) {
+            LOGGER.warn(String.format("Failed resolving CBS client configuration from system environments: %s", e));
+        }
+        return getFallbackConfiguration();
+    }
+
+    @NotNull
+    private ImmutableCbsClientConfiguration getDevConfiguration() {
+        return createCbsClientConfiguration(
+                DEFAULT_PROTOCOL, DEFAULT_HOSTNAME, DEFAULT_APP_NAME,
+                Integer.parseInt(System.getProperty(CBS_PORT_PROPERTY, String.valueOf(DEFAULT_PORT)))
+        );
+    }
+
+    private boolean isDevModeEnabled() {
+        return System.getProperty(DEV_MODE_PROPERTY) != null;
+    }
+
+    private ImmutableCbsClientConfiguration getFallbackConfiguration() {
+        LOGGER.info("Falling back to use default CBS client configuration");
+        return createCbsClientConfiguration(DEFAULT_PROTOCOL, DEFAULT_HOSTNAME, DEFAULT_APP_NAME, DEFAULT_PORT);
+    }
+
+    private ImmutableCbsClientConfiguration createCbsClientConfiguration(String protocol, String hostname,
+        String appName, Integer port) {
+        return ImmutableCbsClientConfiguration.builder()
+            .protocol(protocol)
+            .hostname(hostname)
+            .port(port)
+            .appName(appName)
+            .build();
+    }
+}