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>

2 files changed, 176 insertions, 0 deletions

diff --git a/main/src/test/java/org/onap/policy/distribution/main/rest/TestDistributionStatistics.java b/main/src/test/java/org/onap/policy/distribution/main/rest/TestDistributionStatistics.java
new file mode 100644
index 00000000..92ae14a8
--- /dev/null
+++ b/main/src/test/java/org/onap/policy/distribution/main/rest/TestDistributionStatistics.java
@@ -0,0 +1,129 @@
+/*-
+ * ============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.main.rest;
+
+import static org.junit.Assert.assertEquals;
+
+import javax.ws.rs.client.Client;
+import javax.ws.rs.client.ClientBuilder;
+import javax.ws.rs.client.Invocation;
+import javax.ws.rs.client.WebTarget;
+import javax.ws.rs.core.MediaType;
+
+import org.glassfish.jersey.client.ClientConfig;
+import org.glassfish.jersey.client.authentication.HttpAuthenticationFeature;
+import org.junit.Test;
+import org.onap.policy.common.logging.flexlogger.FlexLogger;
+import org.onap.policy.common.logging.flexlogger.Logger;
+import org.onap.policy.distribution.main.PolicyDistributionException;
+import org.onap.policy.distribution.main.parameters.CommonTestData;
+import org.onap.policy.distribution.main.parameters.RestServerParameters;
+import org.onap.policy.distribution.main.startstop.Main;
+import org.onap.policy.distribution.reception.statistics.DistributionStatisticsManager;
+
+/**
+ * Class to perform unit test of {@link DistributionRestController}.
+ *
+ * @author Ram Krishna Verma (ram.krishna.verma@ericsson.com)
+ */
+public class TestDistributionStatistics {
+
+    private static final Logger LOGGER = FlexLogger.getLogger(TestDistributionStatistics.class);
+
+
+    @Test
+    public void testDistributionStatistics_200() throws PolicyDistributionException, InterruptedException {
+        final Main main = startDistributionService();
+        StatisticsReport report = getDistributionStatistics();
+
+        validateReport(report, 0, 200);
+        updateDistributionStatistics();
+        report = getDistributionStatistics();
+        validateReport(report, 1, 200);
+        stopDistributionService(main);
+        DistributionStatisticsManager.resetAllStatistics();
+    }
+
+    @Test
+    public void testDistributionStatistics_500() throws InterruptedException {
+        final RestServerParameters restServerParams = new CommonTestData().getRestServerParameters(false);
+        restServerParams.setName(CommonTestData.DISTRIBUTION_GROUP_NAME);
+
+        final DistributionRestServer restServer = new DistributionRestServer(restServerParams);
+        restServer.start();
+        final StatisticsReport report = getDistributionStatistics();
+
+        validateReport(report, 0, 500);
+        restServer.shutdown();
+        DistributionStatisticsManager.resetAllStatistics();
+    }
+
+
+    private Main startDistributionService() {
+        final String[] distributionConfigParameters =
+            { "-c", "parameters/DistributionConfigParameters.json" };
+        return new Main(distributionConfigParameters);
+    }
+
+    private void stopDistributionService(final Main main) throws PolicyDistributionException {
+        main.shutdown();
+    }
+
+    private StatisticsReport getDistributionStatistics() throws InterruptedException {
+        StatisticsReport response = null;
+        final ClientConfig clientConfig = new ClientConfig();
+
+        final HttpAuthenticationFeature feature = HttpAuthenticationFeature.basic("healthcheck", "zb!XztG34");
+        clientConfig.register(feature);
+
+        final Client client = ClientBuilder.newClient(clientConfig);
+        final WebTarget webTarget = client.target("http://localhost:6969/statistics");
+
+        final Invocation.Builder invocationBuilder = webTarget.request(MediaType.APPLICATION_JSON);
+        while (response == null) {
+            try {
+                response = invocationBuilder.get(StatisticsReport.class);
+            } catch (final Exception exp) {
+                LOGGER.info("the server is not started yet. We will retry again");
+            }
+        }
+        return response;
+    }
+
+    private void updateDistributionStatistics() {
+        DistributionStatisticsManager.updateTotalDistributionCount();
+        DistributionStatisticsManager.updateDistributionSuccessCount();
+        DistributionStatisticsManager.updateDistributionFailureCount();
+        DistributionStatisticsManager.updateTotalDownloadCount();
+        DistributionStatisticsManager.updateDownloadSuccessCount();
+        DistributionStatisticsManager.updateDownloadFailureCount();
+    }
+
+    private void validateReport(final StatisticsReport report, final int count, final int code) {
+        assertEquals(code, report.getCode());
+        assertEquals(count, report.getTotalDistributionCount());
+        assertEquals(count, report.getDistributionSuccessCount());
+        assertEquals(count, report.getDistributionFailureCount());
+        assertEquals(count, report.getTotalDownloadCount());
+        assertEquals(count, report.getDownloadSuccessCount());
+        assertEquals(count, report.getDownloadFailureCount());
+    }
+}
diff --git a/main/src/test/java/org/onap/policy/distribution/main/rest/TestStatisticsReport.java b/main/src/test/java/org/onap/policy/distribution/main/rest/TestStatisticsReport.java
new file mode 100644
index 00000000..64d2e5c5
--- /dev/null
+++ b/main/src/test/java/org/onap/policy/distribution/main/rest/TestStatisticsReport.java
@@ -0,0 +1,47 @@
+/*-
+ * ============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.main.rest;
+
+import com.openpojo.reflection.filters.FilterClassName;
+import com.openpojo.validation.Validator;
+import com.openpojo.validation.ValidatorBuilder;
+import com.openpojo.validation.rule.impl.SetterMustExistRule;
+import com.openpojo.validation.test.impl.GetterTester;
+import com.openpojo.validation.test.impl.SetterTester;
+
+import org.junit.Test;
+import org.onap.policy.common.utils.validation.ToStringTester;
+
+/**
+ * Class to perform unit testing of {@link StatisticsReport}.
+ *
+ * @author Ram Krishna Verma (ram.krishna.verma@ericsson.com)
+ */
+public class TestStatisticsReport {
+
+    @Test
+    public void testStatisticsReport() {
+        final Validator validator = ValidatorBuilder.create().with(new ToStringTester()).with(new SetterMustExistRule())
+                .with(new SetterTester()).with(new GetterTester()).build();
+        validator.validate(StatisticsReport.class.getPackage().getName(),
+                new FilterClassName(StatisticsReport.class.getName()));
+    }
+}