Metrics and statistics for A1 PMS

Enable app metrics to be collected by Prometheus
Patch set 2: Remove hardcoded defines ccsdk.sli dependency

Issue-ID: CCSDK-3766
Change-Id: I58f05390007b74e58427b9be2711912c551d6e1e
Signed-off-by: halil.cakal <halil.cakal@est.tech>

4 files changed, 80 insertions, 7 deletions

diff --git a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/BeanFactory.java b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/BeanFactory.java
index bf161954..8fc8bc8c 100644
--- a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/BeanFactory.java
+++ b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/BeanFactory.java
@@ -21,7 +21,6 @@
 package org.onap.ccsdk.oran.a1policymanagementservice;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
-
 import org.apache.catalina.connector.Connector;
 import org.onap.ccsdk.oran.a1policymanagementservice.clients.A1ClientFactory;
 import org.onap.ccsdk.oran.a1policymanagementservice.clients.SecurityContext;
diff --git a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v2/PolicyController.java b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v2/PolicyController.java
index 500ddd2a..ee2cae58 100644
--- a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v2/PolicyController.java
+++ b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v2/PolicyController.java
@@ -22,7 +22,6 @@ package org.onap.ccsdk.oran.a1policymanagementservice.controllers.v2;
 
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
-
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.Parameter;
 import io.swagger.v3.oas.annotations.media.Content;
@@ -30,15 +29,12 @@ import io.swagger.v3.oas.annotations.media.Schema;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
 import io.swagger.v3.oas.annotations.responses.ApiResponses;
 import io.swagger.v3.oas.annotations.tags.Tag;
-
 import java.lang.invoke.MethodHandles;
 import java.time.Instant;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
-
 import lombok.Getter;
-
 import org.onap.ccsdk.oran.a1policymanagementservice.clients.A1ClientFactory;
 import org.onap.ccsdk.oran.a1policymanagementservice.controllers.VoidResponse;
 import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.EntityNotFoundException;
diff --git a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/tasks/RefreshCounterTask.java b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/tasks/RefreshCounterTask.java
new file mode 100644
index 00000000..8eb8fbcb
--- /dev/null
+++ b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/tasks/RefreshCounterTask.java
@@ -0,0 +1,78 @@
+/*-
+ * ========================LICENSE_START=================================
+ * ONAP : ccsdk oran
+ * ======================================================================
+ * Copyright (C) 2022 Nordix Foundation. 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.ccsdk.oran.a1policymanagementservice.tasks;
+
+import io.micrometer.core.instrument.MeterRegistry;
+import java.lang.invoke.MethodHandles;
+import java.util.concurrent.atomic.AtomicLong;
+import org.onap.ccsdk.oran.a1policymanagementservice.repository.Policies;
+import org.onap.ccsdk.oran.a1policymanagementservice.repository.PolicyTypes;
+import org.onap.ccsdk.oran.a1policymanagementservice.repository.Rics;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.scheduling.annotation.EnableScheduling;
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.stereotype.Component;
+
+/**
+ * The aim is to collect statistical values from the A1 Policy Management Service.
+ * The counters are being updated every minute.
+ */
+@EnableScheduling
+@Component
+public class RefreshCounterTask {
+
+    private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
+
+    private final Rics rics;
+    private final PolicyTypes policyTypes;
+    private final Policies policies;
+
+    private final MeterRegistry meterRegistry;
+
+    private final AtomicLong ricCount;
+    private final AtomicLong policyTypeCount;
+    private final AtomicLong policyCount;
+
+    @Autowired
+    public RefreshCounterTask(Rics rics, PolicyTypes policyTypes, Policies policies, MeterRegistry meterRegistry) {
+        this.rics = rics;
+        this.policyTypes = policyTypes;
+        this.policies = policies;
+        this.meterRegistry = meterRegistry;
+
+        ricCount = meterRegistry.gauge("total_ric_count", new AtomicLong(0));
+        policyTypeCount = meterRegistry.gauge("total_policy_type_count", new AtomicLong(0));
+        policyCount = meterRegistry.gauge("total_policy_count", new AtomicLong(0));
+    }
+
+    /**
+     * Every minute, updates counters for statistical purposes.
+     */
+    @Scheduled(fixedRate = 1000 * 60)
+    public void checkAllCounters() {
+        logger.trace("Checking counters starting...");
+        ricCount.set(rics.size());
+        policyCount.set(policies.size());
+        policyTypeCount.set(policyTypes.size());
+    }
+}
diff --git a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/tasks/RicSupervision.java b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/tasks/RicSupervision.java
index e3edaf44..7a5f73d4 100644
--- a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/tasks/RicSupervision.java
+++ b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/tasks/RicSupervision.java
@@ -21,7 +21,6 @@
 package org.onap.ccsdk.oran.a1policymanagementservice.tasks;
 
 import java.util.Collection;
-
 import org.onap.ccsdk.oran.a1policymanagementservice.clients.A1Client;
 import org.onap.ccsdk.oran.a1policymanagementservice.clients.A1ClientFactory;
 import org.onap.ccsdk.oran.a1policymanagementservice.clients.AsyncRestClientFactory;
@@ -41,7 +40,6 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.scheduling.annotation.EnableScheduling;
 import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Component;
-
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 
@@ -181,6 +179,7 @@ public class RicSupervision {
                     return Mono.error(new SynchNeededException(ric));
                 }
             }
+
             return Mono.just(ric);
         }
     }
@@ -204,6 +203,7 @@ public class RicSupervision {
                 return Mono.error(new SynchNeededException(ric));
             }
         }
+
         return Mono.just(ric);
     }