Merge "Created external task utils in a common location"

12 files changed, 247 insertions, 238 deletions

diff --git a/adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/audit/AbstractAuditService.java b/adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/audit/AbstractAuditService.java
index 8edce124ec..493ac4a54f 100644
--- a/adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/audit/AbstractAuditService.java
+++ b/adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/audit/AbstractAuditService.java
@@ -22,19 +22,17 @@
 package org.onap.so.adapters.audit;
 
 import java.util.Optional;
-import org.camunda.bpm.client.task.ExternalTask;
-import org.onap.logging.ref.slf4j.ONAPLogConstants;
 import org.onap.so.objects.audit.AAIObjectAudit;
 import org.onap.so.objects.audit.AAIObjectAuditList;
+import org.onap.so.utils.ExternalTaskUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import org.slf4j.MDC;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.core.env.Environment;
 import org.springframework.stereotype.Component;
 
 @Component
-public abstract class AbstractAuditService {
+public abstract class AbstractAuditService extends ExternalTaskUtils {
 
     private static final Logger logger = LoggerFactory.getLogger(AbstractAuditService.class);
 
@@ -82,22 +80,4 @@ public abstract class AbstractAuditService {
         }
     }
 
-    protected String[] getRetrySequence() {
-        return env.getProperty("mso.workflow.topics.retrySequence", String[].class);
-    }
-
-    protected void setupMDC(ExternalTask externalTask) {
-        logger.info(ONAPLogConstants.Markers.ENTRY, "Entering");
-        String msoRequestId = externalTask.getVariable("mso-request-id");
-        if (msoRequestId != null && !msoRequestId.isEmpty()) {
-            MDC.put(ONAPLogConstants.MDCs.REQUEST_ID, msoRequestId);
-        }
-        MDC.put(ONAPLogConstants.MDCs.SERVICE_NAME, externalTask.getTopicName());
-    }
-
-    protected long calculateRetryDelay(int currentRetries) {
-        int retrySequence = getRetrySequence().length - currentRetries;
-        long retryMultiplier = Long.parseLong(env.getProperty("mso.workflow.topics.retryMultiplier", "6000"));
-        return Integer.parseInt(getRetrySequence()[retrySequence]) * retryMultiplier;
-    }
 }
diff --git a/adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/audit/AuditCreateStackService.java b/adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/audit/AuditCreateStackService.java
index 1e5b6de857..d03c86ac30 100644
--- a/adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/audit/AuditCreateStackService.java
+++ b/adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/audit/AuditCreateStackService.java
@@ -34,7 +34,6 @@ import org.onap.so.objects.audit.AAIObjectAuditList;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.core.env.Environment;
 import org.springframework.stereotype.Component;
 
 @Component
@@ -45,9 +44,6 @@ public class AuditCreateStackService extends AbstractAuditService {
     @Autowired
     public HeatStackAudit heatStackAudit;
 
-    @Autowired
-    public Environment environment;
-
     protected void executeExternalTask(ExternalTask externalTask, ExternalTaskService externalTaskService) {
         setupMDC(externalTask);
         AuditInventory auditInventory = externalTask.getVariable("auditInventory");
diff --git a/adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/audit/AuditStackService.java b/adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/audit/AuditStackService.java
index 6a42456715..fb7e925d88 100644
--- a/adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/audit/AuditStackService.java
+++ b/adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/audit/AuditStackService.java
@@ -20,13 +20,9 @@
 
 package org.onap.so.adapters.audit;
 
-import java.security.GeneralSecurityException;
 import javax.annotation.PostConstruct;
 import org.camunda.bpm.client.ExternalTaskClient;
-import org.camunda.bpm.client.backoff.ExponentialBackoffStrategy;
-import org.camunda.bpm.client.interceptor.ClientRequestInterceptor;
-import org.camunda.bpm.client.interceptor.auth.BasicAuthProvider;
-import org.onap.so.utils.CryptoUtils;
+import org.onap.so.utils.ExternalTaskServiceUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -56,10 +52,13 @@ public class AuditStackService {
     @Autowired
     private AuditQueryStackService auditQueryStack;
 
+    @Autowired
+    private ExternalTaskServiceUtils externalTaskServiceUtils;
+
     @PostConstruct
-    public void auditAddAAIInventory() {
-        for (int i = 0; i < getMaxClients(); i++) {
-            ExternalTaskClient client = createExternalTaskClient();
+    public void auditAddAAIInventory() throws Exception {
+        for (int i = 0; i < externalTaskServiceUtils.getMaxClients(); i++) {
+            ExternalTaskClient client = externalTaskServiceUtils.createExternalTaskClient();
             client.subscribe("InventoryAddAudit")
                     .lockDuration(Long.parseLong(env.getProperty("mso.audit.lock-time", DEFAULT_AUDIT_LOCK_TIME)))
                     .handler(auditCreateStack::executeExternalTask).open();
@@ -67,9 +66,9 @@ public class AuditStackService {
     }
 
     @PostConstruct
-    public void auditDeleteAAIInventory() {
-        for (int i = 0; i < getMaxClients(); i++) {
-            ExternalTaskClient client = createExternalTaskClient();
+    public void auditDeleteAAIInventory() throws Exception {
+        for (int i = 0; i < externalTaskServiceUtils.getMaxClients(); i++) {
+            ExternalTaskClient client = externalTaskServiceUtils.createExternalTaskClient();
             client.subscribe("InventoryDeleteAudit")
                     .lockDuration(Long.parseLong(env.getProperty("mso.audit.lock-time", DEFAULT_AUDIT_LOCK_TIME)))
                     .handler(auditDeleteStack::executeExternalTask).open();
@@ -77,35 +76,13 @@ public class AuditStackService {
     }
 
     @PostConstruct
-    public void auditQueryInventory() {
-        for (int i = 0; i < getMaxClients(); i++) {
-            ExternalTaskClient client = createExternalTaskClient();
+    public void auditQueryInventory() throws Exception {
+        for (int i = 0; i < externalTaskServiceUtils.getMaxClients(); i++) {
+            ExternalTaskClient client = externalTaskServiceUtils.createExternalTaskClient();
             client.subscribe("InventoryQueryAudit")
                     .lockDuration(Long.parseLong(env.getProperty("mso.audit.lock-time", DEFAULT_AUDIT_LOCK_TIME)))
                     .handler(auditQueryStack::executeExternalTask).open();
         }
     }
 
-    protected ExternalTaskClient createExternalTaskClient() {
-        ClientRequestInterceptor interceptor = createClientRequestInterceptor();
-        return ExternalTaskClient.create().baseUrl(env.getRequiredProperty("mso.workflow.endpoint")).maxTasks(1)
-                .addInterceptor(interceptor).asyncResponseTimeout(120000)
-                .backoffStrategy(new ExponentialBackoffStrategy(0, 0, 0)).build();
-    }
-
-    protected ClientRequestInterceptor createClientRequestInterceptor() {
-        String auth = "";
-        try {
-            auth = CryptoUtils.decrypt(env.getRequiredProperty("mso.auth"), env.getRequiredProperty("mso.msoKey"));
-        } catch (IllegalStateException | GeneralSecurityException e) {
-            logger.error("Error Decrypting Password", e);
-        }
-        return new BasicAuthProvider(env.getRequiredProperty("mso.config.cadi.aafId"), auth);
-    }
-
-    protected int getMaxClients() {
-        return Integer.parseInt(env.getProperty("workflow.topics.maxClients", DEFAULT_MAX_CLIENTS_FOR_TOPIC));
-    }
-
-
 }
diff --git a/adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/inventory/create/CreateInventoryService.java b/adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/inventory/create/CreateInventoryService.java
index 49a9e7e171..c1cc7428ee 100644
--- a/adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/inventory/create/CreateInventoryService.java
+++ b/adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/inventory/create/CreateInventoryService.java
@@ -20,13 +20,9 @@
 
 package org.onap.so.adapters.inventory.create;
 
-import java.security.GeneralSecurityException;
 import javax.annotation.PostConstruct;
 import org.camunda.bpm.client.ExternalTaskClient;
-import org.camunda.bpm.client.backoff.ExponentialBackoffStrategy;
-import org.camunda.bpm.client.interceptor.ClientRequestInterceptor;
-import org.camunda.bpm.client.interceptor.auth.BasicAuthProvider;
-import org.onap.so.utils.CryptoUtils;
+import org.onap.so.utils.ExternalTaskServiceUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -46,19 +42,13 @@ public class CreateInventoryService {
     @Autowired
     private CreateInventoryTask createInventory;
 
+    @Autowired
+    private ExternalTaskServiceUtils externalTaskServiceUtils;
+
     @PostConstruct
-    public void auditAAIInventory() {
-        String auth = "";
-        try {
-            auth = CryptoUtils.decrypt(env.getRequiredProperty("mso.auth"), env.getRequiredProperty("mso.msoKey"));
-        } catch (IllegalStateException | GeneralSecurityException e) {
-            logger.error("Error Decrypting Password", e);
-        }
-        ClientRequestInterceptor interceptor =
-                new BasicAuthProvider(env.getRequiredProperty("mso.config.cadi.aafId"), auth);
-        ExternalTaskClient client = ExternalTaskClient.create()
-                .baseUrl(env.getRequiredProperty("mso.workflow.endpoint")).maxTasks(1).addInterceptor(interceptor)
-                .asyncResponseTimeout(120000).backoffStrategy(new ExponentialBackoffStrategy(0, 0, 0)).build();
+    public void auditAAIInventory() throws Exception {
+
+        ExternalTaskClient client = externalTaskServiceUtils.createExternalTaskClient();
         client.subscribe("InventoryCreate")
                 .lockDuration(Long.parseLong(env.getProperty("mso.audit.lock-time", "60000")))
                 .handler(createInventory::executeExternalTask).open();
diff --git a/adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/inventory/create/CreateInventoryTask.java b/adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/inventory/create/CreateInventoryTask.java
index a6c61704ad..29d0ef633f 100644
--- a/adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/inventory/create/CreateInventoryTask.java
+++ b/adapters/mso-openstack-adapters/src/main/java/org/onap/so/adapters/inventory/create/CreateInventoryTask.java
@@ -27,15 +27,14 @@ import org.camunda.bpm.client.task.ExternalTaskService;
 import org.onap.logging.ref.slf4j.ONAPLogConstants;
 import org.onap.so.client.graphinventory.GraphInventoryCommonObjectMapperProvider;
 import org.onap.so.objects.audit.AAIObjectAuditList;
+import org.onap.so.utils.ExternalTaskUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import org.slf4j.MDC;
 import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.core.env.Environment;
 import org.springframework.stereotype.Component;
 
 @Component
-public class CreateInventoryTask {
+public class CreateInventoryTask extends ExternalTaskUtils {
 
     private static final String UNABLE_TO_WRITE_ALL_INVENTORY_TO_A_AI = "Unable to write all inventory to A&AI";
 
@@ -46,9 +45,6 @@ public class CreateInventoryTask {
     @Autowired
     CreateAAIInventory createInventory;
 
-    @Autowired
-    public Environment env;
-
     protected void executeExternalTask(ExternalTask externalTask, ExternalTaskService externalTaskService) {
         setupMDC(externalTask);
         boolean success = true;
@@ -107,25 +103,5 @@ public class CreateInventoryTask {
         }
     }
 
-    private void setupMDC(ExternalTask externalTask) {
-        try {
-            logger.info(ONAPLogConstants.Markers.ENTRY, "Entering");
-            MDC.put(ONAPLogConstants.MDCs.SERVICE_NAME, externalTask.getTopicName());
-            String msoRequestId = externalTask.getVariable("mso-request-id");
-            if (msoRequestId != null && !msoRequestId.isEmpty())
-                MDC.put(ONAPLogConstants.MDCs.REQUEST_ID, msoRequestId);
-        } catch (Exception e) {
-            logger.error("Error in setting up MDC", e);
-        }
-    }
-
-    protected long calculateRetryDelay(int currentRetries) {
-        int retrySequence = getRetrySequence().length - currentRetries;
-        long retryMultiplier = Long.parseLong(env.getProperty("mso.workflow.topics.retryMultiplier", "6000"));
-        return Integer.parseInt(getRetrySequence()[retrySequence]) * retryMultiplier;
-    }
 
-    public String[] getRetrySequence() {
-        return env.getProperty("mso.workflow.topics.retrySequence", String[].class);
-    }
 }
diff --git a/adapters/mso-openstack-adapters/src/test/java/org/onap/so/adapters/audit/AuditStackServiceDataTest.java b/adapters/mso-openstack-adapters/src/test/java/org/onap/so/adapters/audit/AuditStackServiceDataTest.java
index 3432e4a8b6..2109fb289f 100644
--- a/adapters/mso-openstack-adapters/src/test/java/org/onap/so/adapters/audit/AuditStackServiceDataTest.java
+++ b/adapters/mso-openstack-adapters/src/test/java/org/onap/so/adapters/audit/AuditStackServiceDataTest.java
@@ -170,47 +170,6 @@ public class AuditStackServiceDataTest extends AuditCreateStackService {
     }
 
     @Test
-    public void retry_sequence_calculation_Test() {
-        long firstRetry = auditStackService.calculateRetryDelay(8);
-        assertEquals(6000L, firstRetry);
-        long secondRetry = auditStackService.calculateRetryDelay(7);
-        assertEquals(6000L, secondRetry);
-        long thirdRetry = auditStackService.calculateRetryDelay(6);
-        assertEquals(12000L, thirdRetry);
-        long fourthRetry = auditStackService.calculateRetryDelay(5);
-        assertEquals(18000L, fourthRetry);
-        long fifthRetry = auditStackService.calculateRetryDelay(4);
-        assertEquals(30000L, fifthRetry);
-        long sixRetry = auditStackService.calculateRetryDelay(3);
-        assertEquals(48000L, sixRetry);
-        long seventhRetry = auditStackService.calculateRetryDelay(2);
-        assertEquals(78000L, seventhRetry);
-        long eigthRetry = auditStackService.calculateRetryDelay(1);
-        assertEquals(120000L, eigthRetry);
-    }
-
-    @Test
-    public void retry_sequence_Test() {
-        long firstRetry = auditStackService.calculateRetryDelay(8);
-        assertEquals(6000L, firstRetry);
-        long secondRetry = auditStackService.calculateRetryDelay(7);
-        assertEquals(6000L, secondRetry);
-        long thirdRetry = auditStackService.calculateRetryDelay(6);
-        assertEquals(12000L, thirdRetry);
-        long fourthRetry = auditStackService.calculateRetryDelay(5);
-        assertEquals(18000L, fourthRetry);
-        long fifthRetry = auditStackService.calculateRetryDelay(4);
-        assertEquals(30000L, fifthRetry);
-        long sixRetry = auditStackService.calculateRetryDelay(3);
-        assertEquals(48000L, sixRetry);
-        long seventhRetry = auditStackService.calculateRetryDelay(2);
-        assertEquals(78000L, seventhRetry);
-        long eigthRetry = auditStackService.calculateRetryDelay(1);
-        assertEquals(120000L, eigthRetry);
-    }
-
-
-    @Test
     public void determineAuditResult_Test() throws Exception {
         boolean actual = auditStackService.didCreateAuditFail(auditListOptSuccess);
         assertEquals(false, actual);
diff --git a/adapters/mso-openstack-adapters/src/test/java/org/onap/so/adapters/audit/AuditStackServiceTest.java b/adapters/mso-openstack-adapters/src/test/java/org/onap/so/adapters/audit/AuditStackServiceTest.java
deleted file mode 100644
index c9aef950f7..0000000000
--- a/adapters/mso-openstack-adapters/src/test/java/org/onap/so/adapters/audit/AuditStackServiceTest.java
+++ /dev/null
@@ -1,91 +0,0 @@
-/*-
- * ============LICENSE_START=======================================================
- * ONAP - SO
- * ================================================================================
- * Copyright (C) 2017 - 2019 AT&T Intellectual Property. 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.so.adapters.audit;
-
-import static com.shazam.shazamcrest.MatcherAssert.assertThat;
-import static com.shazam.shazamcrest.matcher.Matchers.sameBeanAs;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotNull;
-import org.camunda.bpm.client.ExternalTaskClient;
-import org.camunda.bpm.client.interceptor.ClientRequestInterceptor;
-import org.camunda.bpm.client.interceptor.auth.BasicAuthProvider;
-import org.junit.Before;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.mockito.InjectMocks;
-import org.mockito.Mock;
-import org.mockito.Mockito;
-import org.mockito.Spy;
-import org.mockito.junit.MockitoJUnitRunner;
-import org.onap.so.utils.CryptoUtils;
-import org.springframework.core.env.Environment;
-
-@RunWith(MockitoJUnitRunner.class)
-public class AuditStackServiceTest {
-
-    @Spy
-    @InjectMocks
-    AuditStackService auditStackService;
-
-    @Mock
-    Environment mockEnvironment;
-
-
-    @Before
-    public void before() {
-        Mockito.doReturn("5").when(mockEnvironment).getProperty("workflow.topics.maxClients", "10");
-        Mockito.doReturn("6B466C603A260F3655DBF91E53CE54667041C01406D10E8CAF9CC24D8FA5388D06F90BFE4C852052B436")
-                .when(mockEnvironment).getRequiredProperty("mso.auth");
-        Mockito.doReturn("07a7159d3bf51a0e53be7a8f89699be7").when(mockEnvironment).getRequiredProperty("mso.msoKey");
-        Mockito.doReturn("something").when(mockEnvironment).getRequiredProperty("mso.config.cadi.aafId");
-        Mockito.doReturn("host.com").when(mockEnvironment).getRequiredProperty("mso.workflow.endpoint");
-    }
-
-    @Test
-    public void testGetMaxClients() throws Exception {
-        int actual = auditStackService.getMaxClients();
-        assertEquals(5, actual);
-    }
-
-    @Test
-    public void testCreateClientRequestInterceptor() throws Exception {
-        String auth = CryptoUtils.decrypt(
-                "6B466C603A260F3655DBF91E53CE54667041C01406D10E8CAF9CC24D8FA5388D06F90BFE4C852052B436",
-                "07a7159d3bf51a0e53be7a8f89699be7");
-        ClientRequestInterceptor expected = new BasicAuthProvider("something", auth);
-        ClientRequestInterceptor actual = auditStackService.createClientRequestInterceptor();
-        assertThat(actual, sameBeanAs(expected));
-
-    }
-
-    @Test
-    public void testCreateExternalTaskClient() throws Exception {
-        String auth = CryptoUtils.decrypt(
-                "6B466C603A260F3655DBF91E53CE54667041C01406D10E8CAF9CC24D8FA5388D06F90BFE4C852052B436",
-                "07a7159d3bf51a0e53be7a8f89699be7");
-        ClientRequestInterceptor inter = new BasicAuthProvider("something", auth);
-        Mockito.doReturn(inter).when(auditStackService).createClientRequestInterceptor();
-        ExternalTaskClient actual = auditStackService.createExternalTaskClient();
-        assertNotNull(actual);
-        Mockito.verify(auditStackService, Mockito.times(1)).createClientRequestInterceptor();
-
-    }
-}
diff --git a/common/pom.xml b/common/pom.xml
index 2553038e6b..1a4ffe13a8 100644
--- a/common/pom.xml
+++ b/common/pom.xml
@@ -191,7 +191,11 @@
       <artifactId>javatuples</artifactId>
       <version>1.2</version>
     </dependency>
-
+        <dependency>
+      <groupId>org.camunda.bpm</groupId>
+      <artifactId>camunda-external-task-client</artifactId>
+      <version>1.1.1</version>
+    </dependency>
   </dependencies>
   <dependencyManagement>
     <dependencies>
diff --git a/common/src/main/java/org/onap/so/utils/ExternalTaskServiceUtils.java b/common/src/main/java/org/onap/so/utils/ExternalTaskServiceUtils.java
new file mode 100644
index 0000000000..e43b431821
--- /dev/null
+++ b/common/src/main/java/org/onap/so/utils/ExternalTaskServiceUtils.java
@@ -0,0 +1,46 @@
+package org.onap.so.utils;
+
+import java.security.GeneralSecurityException;
+import org.camunda.bpm.client.ExternalTaskClient;
+import org.camunda.bpm.client.interceptor.ClientRequestInterceptor;
+import org.camunda.bpm.client.interceptor.auth.BasicAuthProvider;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.core.env.Environment;
+import org.springframework.stereotype.Component;
+
+@Component
+public class ExternalTaskServiceUtils {
+
+    @Autowired
+    public Environment env;
+
+    private static final Logger logger = LoggerFactory.getLogger(ExternalTaskServiceUtils.class);
+
+    public ExternalTaskClient createExternalTaskClient() throws Exception {
+        String auth = getAuth();
+        ClientRequestInterceptor interceptor = createClientInterceptor(auth);
+        return ExternalTaskClient.create().baseUrl(env.getRequiredProperty("mso.workflow.endpoint")).maxTasks(1)
+                .addInterceptor(interceptor).asyncResponseTimeout(120000).build();
+    }
+
+    protected ClientRequestInterceptor createClientInterceptor(String auth) {
+        return new BasicAuthProvider(env.getRequiredProperty("mso.config.cadi.aafId"), auth);
+    }
+
+    protected String getAuth() throws Exception {
+        try {
+            return CryptoUtils.decrypt(env.getRequiredProperty("mso.auth"), env.getRequiredProperty("mso.msoKey"));
+        } catch (IllegalStateException | GeneralSecurityException e) {
+            logger.error("Error Decrypting Password", e);
+            throw new Exception("Cannot load password");
+        }
+    }
+
+    public int getMaxClients() {
+        return Integer.parseInt(env.getProperty("workflow.topics.maxClients", "3"));
+    }
+
+
+}
diff --git a/common/src/main/java/org/onap/so/utils/ExternalTaskUtils.java b/common/src/main/java/org/onap/so/utils/ExternalTaskUtils.java
new file mode 100644
index 0000000000..349767fc5b
--- /dev/null
+++ b/common/src/main/java/org/onap/so/utils/ExternalTaskUtils.java
@@ -0,0 +1,46 @@
+package org.onap.so.utils;
+
+import org.camunda.bpm.client.task.ExternalTask;
+import org.onap.logging.ref.slf4j.ONAPLogConstants;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.slf4j.MDC;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.core.env.Environment;
+import org.springframework.stereotype.Component;
+
+@Component
+public abstract class ExternalTaskUtils {
+
+    @Autowired
+    Environment env;
+
+    private static final Logger logger = LoggerFactory.getLogger(ExternalTaskUtils.class);
+
+    public long calculateRetryDelay(int currentRetries) {
+        int retrySequence = getRetrySequence().length - currentRetries;
+        return Integer.parseInt(getRetrySequence()[retrySequence]) * getRetryMutiplier();
+    }
+
+    protected Long getRetryMutiplier() {
+        return Long.parseLong(env.getProperty("mso.workflow.topics.retryMultiplier", "6000"));
+    }
+
+    protected String[] getRetrySequence() {
+        String[] seq = {"1", "1", "2", "3", "5", "8", "13", "20"};
+        if (env.getProperty("mso.workflow.topics.retrySequence") != null) {
+            seq = env.getProperty("mso.workflow.topics.retrySequence", String[].class);
+        }
+        return seq;
+    }
+
+    protected void setupMDC(ExternalTask externalTask) {
+        logger.info(ONAPLogConstants.Markers.ENTRY, "Entering");
+        String msoRequestId = externalTask.getVariable("mso-request-id");
+        if (msoRequestId != null && !msoRequestId.isEmpty()) {
+            MDC.put(ONAPLogConstants.MDCs.REQUEST_ID, msoRequestId);
+        }
+        MDC.put(ONAPLogConstants.MDCs.SERVICE_NAME, externalTask.getTopicName());
+    }
+
+}
diff --git a/common/src/test/java/org/onap/so/utils/ExternalTaskServiceUtilsTest.java b/common/src/test/java/org/onap/so/utils/ExternalTaskServiceUtilsTest.java
new file mode 100644
index 0000000000..b2db986d02
--- /dev/null
+++ b/common/src/test/java/org/onap/so/utils/ExternalTaskServiceUtilsTest.java
@@ -0,0 +1,61 @@
+package org.onap.so.utils;
+
+import static org.junit.Assert.assertEquals;
+import static org.mockito.Mockito.doReturn;
+import org.camunda.bpm.client.ExternalTaskClient;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.mockito.Spy;
+import org.mockito.junit.MockitoJUnitRunner;
+import org.springframework.core.env.Environment;
+
+@RunWith(MockitoJUnitRunner.class)
+public class ExternalTaskServiceUtilsTest {
+
+    @Spy
+    @InjectMocks
+    private ExternalTaskServiceUtils utils = new ExternalTaskServiceUtils();
+
+    @Mock
+    private Environment mockEnv;
+
+    @Mock
+    private ExternalTaskClient mockClient;
+
+    @Before
+    public void setup() {
+        MockitoAnnotations.initMocks(this);
+        doReturn("3").when(mockEnv).getProperty("workflow.topics.maxClients", "3");
+        doReturn("07a7159d3bf51a0e53be7a8f89699be7").when(mockEnv).getRequiredProperty("mso.msoKey");
+        doReturn("6B466C603A260F3655DBF91E53CE54667041C01406D10E8CAF9CC24D8FA5388D06F90BFE4C852052B436").when(mockEnv)
+                .getRequiredProperty("mso.auth");
+        doReturn("someid").when(mockEnv).getRequiredProperty("mso.config.cadi.aafId");
+        doReturn("http://camunda.com").when(mockEnv).getRequiredProperty("mso.workflow.endpoint");
+    }
+
+    @Test
+    public void testCreateExternalTaskClient() throws Exception {
+        ExternalTaskClient actualClient = utils.createExternalTaskClient();
+        Assert.assertNotNull(actualClient);
+    }
+
+    @Test
+    public void testGetAuth() throws Exception {
+        String actual = utils.getAuth();
+        String expected = "Att32054Life!@";
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    public void testGetMaxClients() throws Exception {
+        int actual = utils.getMaxClients();
+        int expected = 3;
+        assertEquals(expected, actual);
+    }
+
+}
diff --git a/common/src/test/java/org/onap/so/utils/ExternalTaskUtilsTest.java b/common/src/test/java/org/onap/so/utils/ExternalTaskUtilsTest.java
new file mode 100644
index 0000000000..f918781b39
--- /dev/null
+++ b/common/src/test/java/org/onap/so/utils/ExternalTaskUtilsTest.java
@@ -0,0 +1,65 @@
+package org.onap.so.utils;
+
+import static org.junit.Assert.assertEquals;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.junit.MockitoJUnitRunner;
+import org.springframework.core.env.Environment;
+
+@RunWith(MockitoJUnitRunner.class)
+public class ExternalTaskUtilsTest {
+
+    @Mock
+    private Environment mockenv;
+
+    @InjectMocks
+    private ExternalTaskUtils externalTaskUtilsAnony = new ExternalTaskUtils() {
+
+    };
+
+    @Test
+    public void retry_sequence_calculation_Test() {
+        Mockito.when(mockenv.getProperty("mso.workflow.topics.retryMultiplier", "6000")).thenReturn("6000");
+        long firstRetry = externalTaskUtilsAnony.calculateRetryDelay(8);
+        assertEquals(6000L, firstRetry);
+        long secondRetry = externalTaskUtilsAnony.calculateRetryDelay(7);
+        assertEquals(6000L, secondRetry);
+        long thirdRetry = externalTaskUtilsAnony.calculateRetryDelay(6);
+        assertEquals(12000L, thirdRetry);
+        long fourthRetry = externalTaskUtilsAnony.calculateRetryDelay(5);
+        assertEquals(18000L, fourthRetry);
+        long fifthRetry = externalTaskUtilsAnony.calculateRetryDelay(4);
+        assertEquals(30000L, fifthRetry);
+        long sixRetry = externalTaskUtilsAnony.calculateRetryDelay(3);
+        assertEquals(48000L, sixRetry);
+        long seventhRetry = externalTaskUtilsAnony.calculateRetryDelay(2);
+        assertEquals(78000L, seventhRetry);
+        long eigthRetry = externalTaskUtilsAnony.calculateRetryDelay(1);
+        assertEquals(120000L, eigthRetry);
+    }
+
+    @Test
+    public void retry_sequence_Test() {
+        Mockito.when(mockenv.getProperty("mso.workflow.topics.retryMultiplier", "6000")).thenReturn("6000");
+        long firstRetry = externalTaskUtilsAnony.calculateRetryDelay(8);
+        assertEquals(6000L, firstRetry);
+        long secondRetry = externalTaskUtilsAnony.calculateRetryDelay(7);
+        assertEquals(6000L, secondRetry);
+        long thirdRetry = externalTaskUtilsAnony.calculateRetryDelay(6);
+        assertEquals(12000L, thirdRetry);
+        long fourthRetry = externalTaskUtilsAnony.calculateRetryDelay(5);
+        assertEquals(18000L, fourthRetry);
+        long fifthRetry = externalTaskUtilsAnony.calculateRetryDelay(4);
+        assertEquals(30000L, fifthRetry);
+        long sixRetry = externalTaskUtilsAnony.calculateRetryDelay(3);
+        assertEquals(48000L, sixRetry);
+        long seventhRetry = externalTaskUtilsAnony.calculateRetryDelay(2);
+        assertEquals(78000L, seventhRetry);
+        long eigthRetry = externalTaskUtilsAnony.calculateRetryDelay(1);
+        assertEquals(120000L, eigthRetry);
+    }
+
+}