Adding statistics endpoint to distribution

* Adding statistics endpoint in DistributionRestController
* Adding DistributionStatisticsManager to hold all stats.
* Adding StatisticsReport class to represent distribution stats report.
* Updating stats at each step in SdcReceptionHandler.
* Adding test cases for all code changes.

Change-Id: I0b0f97aecc64b18314367fdff6d3ca7bee06efc7
Issue-ID: POLICY-1035
Signed-off-by: ramverma <ram.krishna.verma@ericsson.com>

1 files changed, 156 insertions, 0 deletions

diff --git a/reception/src/main/java/org/onap/policy/distribution/reception/statistics/DistributionStatisticsManager.java b/reception/src/main/java/org/onap/policy/distribution/reception/statistics/DistributionStatisticsManager.java
new file mode 100644
index 00000000..cd78d254
--- /dev/null
+++ b/reception/src/main/java/org/onap/policy/distribution/reception/statistics/DistributionStatisticsManager.java
@@ -0,0 +1,156 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2018 Ericsson. 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.distribution.reception.statistics;
+
+/**
+ * Class to hold statistical data for distribution component.
+ *
+ * @author Ram Krishna Verma (ram.krishna.verma@ericsson.com)
+ */
+public class DistributionStatisticsManager {
+
+    private static long totalDistributionCount;
+    private static long distributionSuccessCount;
+    private static long distributionFailureCount;
+    private static long totalDownloadCount;
+    private static long downloadSuccessCount;
+    private static long downloadFailureCount;
+
+    /**
+     * Method to update the total distribution count.
+     *
+     * @return the updated value of totalDistributionCount
+     */
+    public static long updateTotalDistributionCount() {
+        return ++totalDistributionCount;
+    }
+
+    /**
+     * Method to update the distribution success count.
+     *
+     * @return the updated value of distributionSuccessCount
+     */
+    public static long updateDistributionSuccessCount() {
+        return ++distributionSuccessCount;
+    }
+
+    /**
+     * Method to update the distribution failure count.
+     *
+     * @return the updated value of distributionFailureCount
+     */
+    public static long updateDistributionFailureCount() {
+        return ++distributionFailureCount;
+    }
+
+    /**
+     * Method to update the total download count.
+     *
+     * @return the updated value of totalDownloadCount
+     */
+    public static long updateTotalDownloadCount() {
+        return ++totalDownloadCount;
+    }
+
+    /**
+     * Method to update the download success count.
+     *
+     * @return the updated value of downloadSuccessCount
+     */
+    public static long updateDownloadSuccessCount() {
+        return ++downloadSuccessCount;
+    }
+
+    /**
+     * Method to update the download failure count.
+     *
+     * @return the updated value of downloadFailureCount
+     */
+    public static long updateDownloadFailureCount() {
+        return ++downloadFailureCount;
+    }
+
+    /**
+     * Returns the current value of totalDistributionCount.
+     *
+     * @return the totalDistributionCount
+     */
+    public static long getTotalDistributionCount() {
+        return totalDistributionCount;
+    }
+
+    /**
+     * Returns the current value of distributionSuccessCount.
+     *
+     * @return the distributionSuccessCount
+     */
+    public static long getDistributionSuccessCount() {
+        return distributionSuccessCount;
+    }
+
+    /**
+     * Returns the current value of distributionFailureCount.
+     *
+     * @return the distributionFailureCount
+     */
+    public static long getDistributionFailureCount() {
+        return distributionFailureCount;
+    }
+
+    /**
+     * Returns the current value of totalDownloadCount.
+     *
+     * @return the totalDownloadCount
+     */
+    public static long getTotalDownloadCount() {
+        return totalDownloadCount;
+    }
+
+    /**
+     * Returns the current value of downloadSuccessCount.
+     *
+     * @return the downloadSuccessCount
+     */
+    public static long getDownloadSuccessCount() {
+        return downloadSuccessCount;
+    }
+
+    /**
+     * Returns the current value of downloadFailureCount.
+     *
+     * @return the downloadFailureCount
+     */
+    public static long getDownloadFailureCount() {
+        return downloadFailureCount;
+    }
+
+    /**
+     * Reset all the statistics counts to 0.
+     */
+    public static void resetAllStatistics() {
+        totalDistributionCount = 0L;
+        distributionSuccessCount = 0L;
+        distributionFailureCount = 0L;
+        totalDownloadCount = 0L;
+        downloadSuccessCount = 0L;
+        downloadFailureCount = 0L;
+    }
+}