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>

5 files changed, 423 insertions, 0 deletions

diff --git a/main/src/main/java/org/onap/policy/distribution/main/rest/DistributionRestController.java b/main/src/main/java/org/onap/policy/distribution/main/rest/DistributionRestController.java
index 95cfdd5c..d7e0f9f5 100644
--- a/main/src/main/java/org/onap/policy/distribution/main/rest/DistributionRestController.java
+++ b/main/src/main/java/org/onap/policy/distribution/main/rest/DistributionRestController.java
@@ -57,4 +57,14 @@ public class DistributionRestController {
     public Response healthcheck() {
         return Response.status(Response.Status.OK).entity(new HealthCheckProvider().performHealthCheck()).build();
     }
+
+    @GET
+    @Path("statistics")
+    @Produces(MediaType.APPLICATION_JSON)
+    @ApiOperation(value = "Fetch current statistics",
+            notes = "Provides current statistics of the Policy Distribution component",
+            response = StatisticsReport.class)
+    public Response statistics() {
+        return Response.status(Response.Status.OK).entity(new StatisticsProvider().fetchCurrentStatistics()).build();
+    }
 }
diff --git a/main/src/main/java/org/onap/policy/distribution/main/rest/StatisticsProvider.java b/main/src/main/java/org/onap/policy/distribution/main/rest/StatisticsProvider.java
new file mode 100644
index 00000000..7532ac61
--- /dev/null
+++ b/main/src/main/java/org/onap/policy/distribution/main/rest/StatisticsProvider.java
@@ -0,0 +1,49 @@
+/*-
+ * ============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 org.onap.policy.distribution.main.startstop.DistributionActivator;
+import org.onap.policy.distribution.reception.statistics.DistributionStatisticsManager;
+
+/**
+ * Class to fetch statistics of distribution service.
+ *
+ * @author Ram Krishna Verma (ram.krishna.verma@ericsson.com)
+ */
+public class StatisticsProvider {
+
+    /**
+     * Returns the current statistics of distribution service.
+     *
+     * @return Report containing statistics of distribution service
+     */
+    public StatisticsReport fetchCurrentStatistics() {
+        final StatisticsReport report = new StatisticsReport();
+        report.setCode(DistributionActivator.isAlive() ? 200 : 500);
+        report.setTotalDistributionCount(DistributionStatisticsManager.getTotalDistributionCount());
+        report.setDistributionSuccessCount(DistributionStatisticsManager.getDistributionSuccessCount());
+        report.setDistributionFailureCount(DistributionStatisticsManager.getDistributionFailureCount());
+        report.setTotalDownloadCount(DistributionStatisticsManager.getTotalDownloadCount());
+        report.setDownloadSuccessCount(DistributionStatisticsManager.getDownloadSuccessCount());
+        report.setDownloadFailureCount(DistributionStatisticsManager.getDownloadFailureCount());
+        return report;
+    }
+}
diff --git a/main/src/main/java/org/onap/policy/distribution/main/rest/StatisticsReport.java b/main/src/main/java/org/onap/policy/distribution/main/rest/StatisticsReport.java
new file mode 100644
index 00000000..4cbbcd70
--- /dev/null
+++ b/main/src/main/java/org/onap/policy/distribution/main/rest/StatisticsReport.java
@@ -0,0 +1,188 @@
+/*-
+ * ============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;
+
+/**
+ * Class to represent statistics report of distribution service.
+ *
+ * @author Ram Krishna Verma (ram.krishna.verma@ericsson.com)
+ */
+public class StatisticsReport {
+
+    private int code;
+    private long totalDistributionCount;
+    private long distributionSuccessCount;
+    private long distributionFailureCount;
+    private long totalDownloadCount;
+    private long downloadSuccessCount;
+    private long downloadFailureCount;
+
+    /**
+     * Returns the code of this {@link StatisticsReport} instance.
+     *
+     * @return the code
+     */
+    public int getCode() {
+        return code;
+    }
+
+    /**
+     * Set code in this {@link StatisticsReport} instance.
+     *
+     * @param code the code to set
+     */
+    public void setCode(final int code) {
+        this.code = code;
+    }
+
+    /**
+     * Returns the totalDistributionCount of this {@link StatisticsReport} instance.
+     *
+     * @return the totalDistributionCount
+     */
+    public long getTotalDistributionCount() {
+        return totalDistributionCount;
+    }
+
+    /**
+     * Set totalDistributionCount in this {@link StatisticsReport} instance.
+     *
+     * @param totalDistributionCount the totalDistributionCount to set
+     */
+    public void setTotalDistributionCount(final long totalDistributionCount) {
+        this.totalDistributionCount = totalDistributionCount;
+    }
+
+    /**
+     * Returns the distributionSuccessCount of this {@link StatisticsReport} instance.
+     *
+     * @return the distributionSuccessCount
+     */
+    public long getDistributionSuccessCount() {
+        return distributionSuccessCount;
+    }
+
+    /**
+     * Set distributionSuccessCount in this {@link StatisticsReport} instance.
+     *
+     * @param distributionSuccessCount the distributionSuccessCount to set
+     */
+    public void setDistributionSuccessCount(final long distributionSuccessCount) {
+        this.distributionSuccessCount = distributionSuccessCount;
+    }
+
+    /**
+     * Returns the distributionFailureCount of this {@link StatisticsReport} instance.
+     *
+     * @return the distributionFailureCount
+     */
+    public long getDistributionFailureCount() {
+        return distributionFailureCount;
+    }
+
+    /**
+     * Set distributionFailureCount in this {@link StatisticsReport} instance.
+     *
+     * @param distributionFailureCount the distributionFailureCount to set
+     */
+    public void setDistributionFailureCount(final long distributionFailureCount) {
+        this.distributionFailureCount = distributionFailureCount;
+    }
+
+    /**
+     * Returns the totalDownloadCount of this {@link StatisticsReport} instance.
+     *
+     * @return the totalDownloadCount
+     */
+    public long getTotalDownloadCount() {
+        return totalDownloadCount;
+    }
+
+    /**
+     * Set totalDownloadCount in this {@link StatisticsReport} instance.
+     *
+     * @param totalDownloadCount the totalDownloadCount to set
+     */
+    public void setTotalDownloadCount(final long totalDownloadCount) {
+        this.totalDownloadCount = totalDownloadCount;
+    }
+
+    /**
+     * Returns the downloadSuccessCount of this {@link StatisticsReport} instance.
+     *
+     * @return the downloadSuccessCount
+     */
+    public long getDownloadSuccessCount() {
+        return downloadSuccessCount;
+    }
+
+    /**
+     * Set downloadSuccessCount in this {@link StatisticsReport} instance.
+     *
+     * @param downloadSuccessCount the downloadSuccessCount to set
+     */
+    public void setDownloadSuccessCount(final long downloadSuccessCount) {
+        this.downloadSuccessCount = downloadSuccessCount;
+    }
+
+    /**
+     * Returns the downloadFailureCount of this {@link StatisticsReport} instance.
+     *
+     * @return the downloadFailureCount
+     */
+    public long getDownloadFailureCount() {
+        return downloadFailureCount;
+    }
+
+    /**
+     * Set downloadFailureCount in this {@link StatisticsReport} instance.
+     *
+     * @param downloadFailureCount the downloadFailureCount to set
+     */
+    public void setDownloadFailureCount(final long downloadFailureCount) {
+        this.downloadFailureCount = downloadFailureCount;
+    }
+
+
+    /**
+     * {@inheritDoc}.
+     */
+    @Override
+    public String toString() {
+        final StringBuilder builder = new StringBuilder();
+        builder.append("StatisticsReport [code=");
+        builder.append(getCode());
+        builder.append(", totalDistributionCount=");
+        builder.append(getTotalDistributionCount());
+        builder.append(", distributionSuccessCount=");
+        builder.append(getDistributionSuccessCount());
+        builder.append(", distributionFailureCount=");
+        builder.append(getDistributionFailureCount());
+        builder.append(", totalDownloadCount=");
+        builder.append(getTotalDownloadCount());
+        builder.append(", downloadSuccessCount=");
+        builder.append(getDownloadSuccessCount());
+        builder.append(", downloadFailureCount=");
+        builder.append(getDownloadFailureCount());
+        builder.append("]");
+        return builder.toString();
+    }
+}
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()));
+    }
+}