Created new BB for so-etsi

Change-Id: I9bf6b4019c280b816925ee5e0d826bff69cb1583
Issue-ID: SO-1621
Signed-off-by: waqas.ikram <waqas.ikram@est.tech>

13 files changed, 922 insertions, 8 deletions

diff --git a/common/src/main/java/org/onap/so/client/RestTemplateConfig.java b/common/src/main/java/org/onap/so/client/RestTemplateConfig.java
index 14556f1211..34ad6ef758 100644
--- a/common/src/main/java/org/onap/so/client/RestTemplateConfig.java
+++ b/common/src/main/java/org/onap/so/client/RestTemplateConfig.java
@@ -20,7 +20,10 @@
 
 package org.onap.so.client;
 
+import org.onap.so.configuration.rest.HttpComponentsClientConfiguration;
 import org.onap.so.logging.jaxrs.filter.SpringClientFilter;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.http.client.BufferingClientHttpRequestFactory;
@@ -30,11 +33,28 @@ import org.springframework.web.client.RestTemplate;
 @Configuration
 public class RestTemplateConfig {
 
-	@Bean
-	public RestTemplate restTemplate() {
-		RestTemplate restTemplate = new RestTemplate();		
-		restTemplate.setRequestFactory(new BufferingClientHttpRequestFactory(new HttpComponentsClientHttpRequestFactory()));
-		restTemplate.getInterceptors().add(new SpringClientFilter());
-		return restTemplate;
-	}
+    public static final String CONFIGURABLE_REST_TEMPLATE = "configurableRestTemplate";
+
+    @Autowired
+    private HttpComponentsClientConfiguration httpComponentsClientConfiguration;
+
+    @Bean
+    public RestTemplate restTemplate() {
+        final RestTemplate restTemplate = new RestTemplate();
+        restTemplate
+                .setRequestFactory(new BufferingClientHttpRequestFactory(new HttpComponentsClientHttpRequestFactory()));
+        restTemplate.getInterceptors().add(new SpringClientFilter());
+        return restTemplate;
+    }
+
+    @Bean
+    @Qualifier(CONFIGURABLE_REST_TEMPLATE)
+    public RestTemplate configurableRestTemplate() {
+        final HttpComponentsClientHttpRequestFactory clientHttpRequestFactory =
+                httpComponentsClientConfiguration.httpComponentsClientHttpRequestFactory();
+        final RestTemplate restTemplate =
+                new RestTemplate(new BufferingClientHttpRequestFactory(clientHttpRequestFactory));
+        restTemplate.getInterceptors().add(new SpringClientFilter());
+        return restTemplate;
+    }
 }
diff --git a/common/src/main/java/org/onap/so/configuration/rest/BasicHttpHeadersProvider.java b/common/src/main/java/org/onap/so/configuration/rest/BasicHttpHeadersProvider.java
new file mode 100644
index 0000000000..7606f3a8d3
--- /dev/null
+++ b/common/src/main/java/org/onap/so/configuration/rest/BasicHttpHeadersProvider.java
@@ -0,0 +1,54 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.so.configuration.rest;
+
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.MediaType;
+
+/**
+ * @author waqas.ikram@est.tech
+ */
+public class BasicHttpHeadersProvider implements HttpHeadersProvider {
+
+    public static final String AUTHORIZATION_HEADER = "Authorization";
+
+    private final HttpHeaders headers = new HttpHeaders();
+
+    public BasicHttpHeadersProvider(final String authorization) {
+        headers.add(AUTHORIZATION_HEADER, authorization);
+        headers.setContentType(MediaType.APPLICATION_JSON);
+    }
+
+    public BasicHttpHeadersProvider() {
+        headers.setContentType(MediaType.APPLICATION_JSON);
+    }
+
+    @Override
+    public HttpHeaders getHttpHeaders() {
+        return headers;
+    }
+
+    @Override
+    public String toString() {
+        return "BasicHttpHeadersProvider [headers=" + headers + "]";
+    }
+
+}
diff --git a/common/src/main/java/org/onap/so/configuration/rest/HttpClientConnectionConfiguration.java b/common/src/main/java/org/onap/so/configuration/rest/HttpClientConnectionConfiguration.java
new file mode 100644
index 0000000000..a5a4cb7d53
--- /dev/null
+++ b/common/src/main/java/org/onap/so/configuration/rest/HttpClientConnectionConfiguration.java
@@ -0,0 +1,87 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.so.configuration.rest;
+
+import java.util.concurrent.TimeUnit;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+
+/**
+ * This class is used configure the parameters needed for
+ * {@link org.apache.http.impl.client.CloseableHttpClient}
+ * 
+ * @author waqas.ikram@est.tech
+ */
+@Service
+public class HttpClientConnectionConfiguration {
+
+    @Value(value = "${rest.http.client.configuration.connTimeOutInSec:10}")
+    private int connectionTimeOutInSeconds;
+
+    @Value(value = "${rest.http.client.configuration.socketTimeOutInSec:180}")
+    private int socketTimeOutInSeconds;
+
+    @Value(value = "${rest.http.client.configuration.socketTimeOutInSec:600}")
+    private int timeToLiveInSeconds;
+
+    @Value(value = "${rest.http.client.configuration.maxConnections:10}")
+    private int maxConnections;
+
+    @Value(value = "${rest.http.client.configuration.maxConnectionsPerRoute:2}")
+    private int maxConnectionsPerRoute;
+
+    /**
+     * @return the socket connection time out in milliseconds
+     */
+    public int getSocketTimeOutInMiliSeconds() {
+        return (int) TimeUnit.SECONDS.toMillis(socketTimeOutInSeconds);
+    }
+
+    /**
+     * @return the maximum total connection value.
+     */
+    public int getMaxConnections() {
+        return maxConnections;
+    }
+
+    /**
+     * @return the maximum connection per route value.
+     */
+    public int getMaxConnectionsPerRoute() {
+        return maxConnectionsPerRoute;
+    }
+
+    /**
+     * @return the connect time out value in milliseconds.
+     */
+    public int getConnectionTimeOutInMilliSeconds() {
+        return (int) TimeUnit.SECONDS.toMillis(connectionTimeOutInSeconds);
+    }
+
+    /**
+     * @return the connection time to live value in mintues.
+     */
+    public int getTimeToLiveInMins() {
+        return (int) TimeUnit.SECONDS.toMinutes(timeToLiveInSeconds);
+    }
+
+}
diff --git a/common/src/main/java/org/onap/so/configuration/rest/HttpComponentsClientConfiguration.java b/common/src/main/java/org/onap/so/configuration/rest/HttpComponentsClientConfiguration.java
new file mode 100644
index 0000000000..e943aef159
--- /dev/null
+++ b/common/src/main/java/org/onap/so/configuration/rest/HttpComponentsClientConfiguration.java
@@ -0,0 +1,73 @@
+/*-
+ * ============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.so.configuration.rest;
+
+import java.util.concurrent.TimeUnit;
+
+import org.apache.http.client.config.RequestConfig;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClientBuilder;
+import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
+
+/**
+ * Allow user to configure {@link org.apache.http.client.HttpClient}
+ * 
+ * @author waqas.ikram@est.tech
+ */
+@Configuration
+public class HttpComponentsClientConfiguration {
+
+    private final HttpClientConnectionConfiguration clientConnectionConfiguration;
+
+    @Autowired
+    public HttpComponentsClientConfiguration(final HttpClientConnectionConfiguration clientConnectionConfiguration) {
+        this.clientConnectionConfiguration = clientConnectionConfiguration;
+    }
+
+    @Bean
+    public HttpComponentsClientHttpRequestFactory httpComponentsClientHttpRequestFactory() {
+        return new HttpComponentsClientHttpRequestFactory(httpClient());
+    }
+
+    @Bean
+    public CloseableHttpClient httpClient() {
+        return HttpClientBuilder.create().setConnectionManager(poolingHttpClientConnectionManager())
+                .setMaxConnPerRoute(clientConnectionConfiguration.getMaxConnectionsPerRoute())
+                .setMaxConnTotal(clientConnectionConfiguration.getMaxConnections())
+                .setDefaultRequestConfig(requestConfig()).build();
+    }
+
+    @Bean
+    public PoolingHttpClientConnectionManager poolingHttpClientConnectionManager() {
+        return new PoolingHttpClientConnectionManager(clientConnectionConfiguration.getTimeToLiveInMins(),
+                TimeUnit.MINUTES);
+    }
+
+    @Bean
+    public RequestConfig requestConfig() {
+        return RequestConfig.custom().setSocketTimeout(clientConnectionConfiguration.getSocketTimeOutInMiliSeconds())
+                .setConnectTimeout(clientConnectionConfiguration.getConnectionTimeOutInMilliSeconds()).build();
+    }
+}
diff --git a/common/src/main/java/org/onap/so/configuration/rest/HttpHeadersProvider.java b/common/src/main/java/org/onap/so/configuration/rest/HttpHeadersProvider.java
new file mode 100644
index 0000000000..0cff7b4ba0
--- /dev/null
+++ b/common/src/main/java/org/onap/so/configuration/rest/HttpHeadersProvider.java
@@ -0,0 +1,35 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.so.configuration.rest;
+
+import org.springframework.http.HttpHeaders;
+
+/**
+ * Providers {@link org.springframework.http.HttpHeaders} for HTTP requests
+ * 
+ * @author waqas.ikram@est.tech
+ *
+ */
+public interface HttpHeadersProvider {
+
+    HttpHeaders getHttpHeaders();
+
+}
diff --git a/common/src/main/java/org/onap/so/logging/jaxrs/filter/SpringClientFilter.java b/common/src/main/java/org/onap/so/logging/jaxrs/filter/SpringClientFilter.java
index cecef1945b..ed63a706a2 100644
--- a/common/src/main/java/org/onap/so/logging/jaxrs/filter/SpringClientFilter.java
+++ b/common/src/main/java/org/onap/so/logging/jaxrs/filter/SpringClientFilter.java
@@ -57,6 +57,7 @@ public class SpringClientFilter implements ClientHttpRequestInterceptor {
     }
  
     private void processRequest(HttpRequest request, byte[] body) throws IOException {
+     setInvocationId();
     	setupHeaders(request);
     	setupMDC(request);
         if (log.isDebugEnabled()) {
@@ -89,7 +90,6 @@ public class SpringClientFilter implements ClientHttpRequestInterceptor {
         MDC.put(ONAPLogConstants.MDCs.INVOKE_TIMESTAMP, ZonedDateTime.now(ZoneOffset.UTC).format(DateTimeFormatter.ISO_INSTANT));
         MDC.put(ONAPLogConstants.MDCs.TARGET_SERVICE_NAME, clientRequest.getURI().toString());       
         MDC.put(ONAPLogConstants.MDCs.RESPONSE_STATUS_CODE, ONAPLogConstants.ResponseStatus.INPROGRESS.toString());
-        setInvocationId();
         MDC.put(ONAPLogConstants.MDCs.TARGET_ENTITY,extractTargetEntity(clientRequest));
     }
     
diff --git a/common/src/main/java/org/onap/so/rest/exceptions/InvalidRestRequestException.java b/common/src/main/java/org/onap/so/rest/exceptions/InvalidRestRequestException.java
new file mode 100644
index 0000000000..2a9799315e
--- /dev/null
+++ b/common/src/main/java/org/onap/so/rest/exceptions/InvalidRestRequestException.java
@@ -0,0 +1,37 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.so.rest.exceptions;
+
+/**
+ * @author waqas.ikram@est.tech
+ *
+ */
+public class InvalidRestRequestException extends RuntimeException {
+    private static final long serialVersionUID = -1158414939006977465L;
+
+    public InvalidRestRequestException(final String message) {
+        super(message);
+    }
+
+    public InvalidRestRequestException(final String message, final Throwable cause) {
+        super(message, cause);
+    }
+}
diff --git a/common/src/main/java/org/onap/so/rest/exceptions/RestProcessingException.java b/common/src/main/java/org/onap/so/rest/exceptions/RestProcessingException.java
new file mode 100644
index 0000000000..e8ce00c7e5
--- /dev/null
+++ b/common/src/main/java/org/onap/so/rest/exceptions/RestProcessingException.java
@@ -0,0 +1,37 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.so.rest.exceptions;
+
+/**
+ * @author waqas.ikram@est.tech
+ *
+ */
+public class RestProcessingException extends RuntimeException {
+
+    private static final long serialVersionUID = 16862313537198441L;
+
+    public RestProcessingException(final String message) {
+        super(message);
+    }
+
+    public RestProcessingException(final String message, final Throwable cause) {
+        super(message, cause);
+    }
+}
diff --git a/common/src/main/java/org/onap/so/rest/service/HttpRestServiceProvider.java b/common/src/main/java/org/onap/so/rest/service/HttpRestServiceProvider.java
new file mode 100644
index 0000000000..43b2fb4292
--- /dev/null
+++ b/common/src/main/java/org/onap/so/rest/service/HttpRestServiceProvider.java
@@ -0,0 +1,72 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.so.rest.service;
+
+import org.springframework.http.ResponseEntity;
+
+import com.google.common.base.Optional;
+
+/**
+ * @author waqas.ikram@est.tech
+ */
+public interface HttpRestServiceProvider {
+
+    /**
+     * Execute the HTTP GET to the given URI template
+     * 
+     * @param url the URL
+     * @param clazz the type of the return value
+     * @return Returns the body of this entity.
+     */
+    public <T> Optional<T> get(final String url, final Class<T> clazz);
+
+    /**
+     * Execute the HTTP GET to the given URI template
+     * 
+     * @param url the URL
+     * @param clazz the type of the return value
+     * @return Returns the {@link ResponseEntity}.
+     */
+    public <T> ResponseEntity<T> getHttpResponse(final String url, final Class<T> clazz);
+
+
+    /**
+     * Execute the HTTP POST to the given URI template
+     * 
+     * @param object the entity (i.e. body) to write to the request
+     * @param url the URL
+     * @param clazz the type of the return value
+     * @return Returns the body of this entity.
+     */
+    public <T> Optional<T> post(final Object object, final String url, final Class<T> clazz);
+
+    /**
+     * Execute the HTTP POST to the given URI template
+     * 
+     * @param object the entity (i.e. body) to write to the request
+     * @param url the URL
+     * @param clazz the type of the return value
+     * @return Returns the {@link ResponseEntity}.
+     */
+    public <T> ResponseEntity<T> postHttpRequest(final Object object, final String url, final Class<T> clazz);
+
+
+}
diff --git a/common/src/main/java/org/onap/so/rest/service/HttpRestServiceProviderImpl.java b/common/src/main/java/org/onap/so/rest/service/HttpRestServiceProviderImpl.java
new file mode 100644
index 0000000000..032df84a98
--- /dev/null
+++ b/common/src/main/java/org/onap/so/rest/service/HttpRestServiceProviderImpl.java
@@ -0,0 +1,144 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.so.rest.service;
+
+import org.onap.so.configuration.rest.BasicHttpHeadersProvider;
+import org.onap.so.configuration.rest.HttpHeadersProvider;
+import org.onap.so.rest.exceptions.InvalidRestRequestException;
+import org.onap.so.rest.exceptions.RestProcessingException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpMethod;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.client.HttpClientErrorException;
+import org.springframework.web.client.RestClientException;
+import org.springframework.web.client.RestTemplate;
+
+import com.google.common.base.Optional;
+
+/**
+ * A Service to perform HTTP requests
+ * 
+ * @author waqas.ikram@est.tech
+ */
+public class HttpRestServiceProviderImpl implements HttpRestServiceProvider {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(HttpRestServiceProviderImpl.class);
+    private final RestTemplate restTemplate;
+    private final HttpHeadersProvider httpHeadersProvider;
+
+    public HttpRestServiceProviderImpl(final RestTemplate restTemplate) {
+        this.restTemplate = restTemplate;
+        this.httpHeadersProvider = new BasicHttpHeadersProvider();
+    }
+
+    public HttpRestServiceProviderImpl(final RestTemplate restTemplate, final HttpHeadersProvider httpHeadersProvider) {
+        this.restTemplate = restTemplate;
+        this.httpHeadersProvider = httpHeadersProvider;
+    }
+
+    @Override
+    public <T> Optional<T> get(final String url, final Class<T> clazz) {
+        final ResponseEntity<T> response = getHttpResponse(url, clazz);
+        if (!response.getStatusCode().equals(HttpStatus.OK)) {
+            final String message =
+                    "Unable to invoke HTTP GET using URL: " + url + ", Response Code: " + response.getStatusCode();
+            LOGGER.error(message);
+            return Optional.absent();
+        }
+
+        if (response.hasBody()) {
+            return Optional.of(response.getBody());
+        }
+        return Optional.absent();
+    }
+
+
+    @Override
+    public <T> ResponseEntity<T> getHttpResponse(final String url, final Class<T> clazz) {
+        LOGGER.trace("Will invoke HTTP GET using URL: {}", url);
+        try {
+            final HttpEntity<?> request = new HttpEntity<>(getHttpHeaders());
+            return restTemplate.exchange(url, HttpMethod.GET, request, clazz);
+
+        } catch (final HttpClientErrorException httpClientErrorException) {
+            final String message = "Unable to invoke HTTP GET using url: " + url + ", Response: "
+                    + httpClientErrorException.getRawStatusCode();
+            LOGGER.error(message, httpClientErrorException);
+            final int rawStatusCode = httpClientErrorException.getRawStatusCode();
+            if (rawStatusCode == HttpStatus.BAD_REQUEST.value() || rawStatusCode == HttpStatus.NOT_FOUND.value()) {
+                throw new InvalidRestRequestException("No result found for given url: " + url);
+            }
+            throw new RestProcessingException("Unable to invoke HTTP GET using URL: " + url);
+
+        } catch (final RestClientException restClientException) {
+            LOGGER.error("Unable to invoke HTTP GET using url: {}", url, restClientException);
+            throw new RestProcessingException("Unable to invoke HTTP GET using URL: " + url, restClientException);
+        }
+    }
+
+    @Override
+    public <T> Optional<T> post(final Object object, final String url, final Class<T> clazz) {
+        final ResponseEntity<T> response = postHttpRequest(object, url, clazz);
+        if (!response.getStatusCode().equals(HttpStatus.OK)) {
+            final String message =
+                    "Unable to invoke HTTP GET using URL: " + url + ", Response Code: " + response.getStatusCode();
+            LOGGER.error(message);
+            return Optional.absent();
+        }
+
+        if (response.hasBody()) {
+            return Optional.of(response.getBody());
+        }
+
+        return Optional.absent();
+    }
+
+
+    @Override
+    public <T> ResponseEntity<T> postHttpRequest(final Object object, final String url, final Class<T> clazz) {
+        try {
+            final HttpEntity<?> request = new HttpEntity<>(object, getHttpHeaders());
+            return restTemplate.exchange(url, HttpMethod.POST, request, clazz);
+
+        } catch (final HttpClientErrorException httpClientErrorException) {
+            final String message = "Unable to invoke HTTP POST using url: " + url + ", Response: "
+                    + httpClientErrorException.getRawStatusCode();
+            LOGGER.error(message, httpClientErrorException);
+            final int rawStatusCode = httpClientErrorException.getRawStatusCode();
+            if (rawStatusCode == HttpStatus.BAD_REQUEST.value() || rawStatusCode == HttpStatus.NOT_FOUND.value()) {
+                throw new InvalidRestRequestException("No result found for given url: " + url);
+            }
+            throw new RestProcessingException("Unable to invoke HTTP GET using URL: " + url);
+
+        } catch (final RestClientException restClientException) {
+            LOGGER.error("Unable to invoke HTTP POST using url: {}", url, restClientException);
+            throw new RestProcessingException("Unable to invoke HTTP GET using URL: " + url, restClientException);
+        }
+    }
+
+    private HttpHeaders getHttpHeaders() {
+        return httpHeadersProvider.getHttpHeaders();
+    }
+}
diff --git a/common/src/test/java/org/onap/so/configuration/rest/BasicHttpHeadersProviderTest.java b/common/src/test/java/org/onap/so/configuration/rest/BasicHttpHeadersProviderTest.java
new file mode 100644
index 0000000000..3e762cfbe7
--- /dev/null
+++ b/common/src/test/java/org/onap/so/configuration/rest/BasicHttpHeadersProviderTest.java
@@ -0,0 +1,58 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.so.configuration.rest;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+import static org.onap.so.configuration.rest.BasicHttpHeadersProvider.AUTHORIZATION_HEADER;
+
+import java.util.Arrays;
+
+import org.junit.Test;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.MediaType;
+
+
+/**
+ * @author waqas.ikram@est.tech
+ *
+ */
+public class BasicHttpHeadersProviderTest {
+
+    private static final String BASIC_AUTH_VALUE = "Basic AuthValue";
+
+    @Test
+    public void test_getHttpHeaders_ContentTypeIsJson() {
+        final HttpHeadersProvider objUnderTest = new BasicHttpHeadersProvider();
+        final HttpHeaders actualHttpHeaders = objUnderTest.getHttpHeaders();
+        assertNull(actualHttpHeaders.get(AUTHORIZATION_HEADER));
+        assertEquals(MediaType.APPLICATION_JSON, actualHttpHeaders.getContentType());
+    }
+
+    @Test
+    public void test_getHttpHeaders_ContainAuthorizationHeader() {
+        final HttpHeadersProvider objUnderTest = new BasicHttpHeadersProvider(BASIC_AUTH_VALUE);
+        final HttpHeaders actualHttpHeaders = objUnderTest.getHttpHeaders();
+        assertEquals(Arrays.asList(BASIC_AUTH_VALUE), actualHttpHeaders.get(AUTHORIZATION_HEADER));
+        assertEquals(MediaType.APPLICATION_JSON, actualHttpHeaders.getContentType());
+    }
+
+}
diff --git a/common/src/test/java/org/onap/so/configuration/rest/HttpComponentsClientConfigurationTest.java b/common/src/test/java/org/onap/so/configuration/rest/HttpComponentsClientConfigurationTest.java
new file mode 100644
index 0000000000..5084acc934
--- /dev/null
+++ b/common/src/test/java/org/onap/so/configuration/rest/HttpComponentsClientConfigurationTest.java
@@ -0,0 +1,45 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.so.configuration.rest;
+
+import static org.junit.Assert.assertNotNull;
+
+import org.junit.Test;
+import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
+
+/**
+ * @author waqas.ikram@est.tech
+ */
+public class HttpComponentsClientConfigurationTest {
+
+    @Test
+    public void test_httpComponentsClientHttpRequestFactory_HttpComponentsClientHttpRequestFactoryNotNull() {
+        final HttpClientConnectionConfiguration clientConnectionConfiguration = new HttpClientConnectionConfiguration();
+        final HttpComponentsClientConfiguration objUnderTest =
+                new HttpComponentsClientConfiguration(clientConnectionConfiguration);
+
+        final HttpComponentsClientHttpRequestFactory factory = objUnderTest.httpComponentsClientHttpRequestFactory();
+        assertNotNull(factory);
+        assertNotNull(factory.getHttpClient());
+
+    }
+
+}
diff --git a/common/src/test/java/org/onap/so/rest/service/HttpRestServiceProviderImplTest.java b/common/src/test/java/org/onap/so/rest/service/HttpRestServiceProviderImplTest.java
new file mode 100644
index 0000000000..a738afe565
--- /dev/null
+++ b/common/src/test/java/org/onap/so/rest/service/HttpRestServiceProviderImplTest.java
@@ -0,0 +1,252 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.so.rest.service;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.atLeastOnce;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnitRunner;
+import org.onap.so.rest.exceptions.InvalidRestRequestException;
+import org.onap.so.rest.exceptions.RestProcessingException;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpMethod;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.client.HttpClientErrorException;
+import org.springframework.web.client.RestClientException;
+import org.springframework.web.client.RestTemplate;
+
+import com.google.common.base.Optional;
+
+
+/**
+ * @author waqas.ikram@est.tech
+ */
+@RunWith(MockitoJUnitRunner.class)
+public class HttpRestServiceProviderImplTest {
+
+    private static final String BODY = "{}";
+    private static final String DUMMY_URL = "http://localhost:9000/dummy/url";
+
+    @Mock
+    private RestTemplate mockRestTemplate;
+
+    @Mock
+    private ResponseEntity<String> mockEntity;
+
+    @Test
+    public void test_get_returnOptionalPresentIfResponseIsOKAndHasBody() {
+
+        final HttpRestServiceProvider objUnderTest = new HttpRestServiceProviderImpl(mockRestTemplate);
+
+        when(mockRestTemplate.exchange(eq(DUMMY_URL), eq(HttpMethod.GET), any(HttpEntity.class), eq(String.class)))
+                .thenReturn(mockEntity);
+
+        when(mockEntity.getStatusCode()).thenReturn(HttpStatus.OK);
+        when(mockEntity.hasBody()).thenReturn(true);
+        when(mockEntity.getBody()).thenReturn(BODY);
+
+        final Optional<String> actual = objUnderTest.get(DUMMY_URL, String.class);
+
+        assertTrue(actual.isPresent());
+        verify(mockRestTemplate, atLeastOnce()).exchange(eq(DUMMY_URL), eq(HttpMethod.GET), any(HttpEntity.class),
+                eq(String.class));
+    }
+
+    @Test
+    public void test_get_returnOptionalPresentIfResponseIsNotOK() {
+        final HttpRestServiceProvider objUnderTest = new HttpRestServiceProviderImpl(mockRestTemplate);
+
+        when(mockRestTemplate.exchange(eq(DUMMY_URL), eq(HttpMethod.GET), any(HttpEntity.class), eq(String.class)))
+                .thenReturn(mockEntity);
+
+        when(mockEntity.getStatusCode()).thenReturn(HttpStatus.INTERNAL_SERVER_ERROR);
+
+        final Optional<String> actual = objUnderTest.get(DUMMY_URL, String.class);
+
+        assertFalse(actual.isPresent());
+        verify(mockRestTemplate, atLeastOnce()).exchange(eq(DUMMY_URL), eq(HttpMethod.GET), any(HttpEntity.class),
+                eq(String.class));
+    }
+
+    @Test
+    public void test_get_returnOptionalPresentIfResponseIsOKAndNoBody() {
+        final HttpRestServiceProvider objUnderTest = new HttpRestServiceProviderImpl(mockRestTemplate);
+
+        when(mockRestTemplate.exchange(eq(DUMMY_URL), eq(HttpMethod.GET), any(HttpEntity.class), eq(String.class)))
+                .thenReturn(mockEntity);
+
+        when(mockEntity.getStatusCode()).thenReturn(HttpStatus.OK);
+        when(mockEntity.hasBody()).thenReturn(false);
+
+        final Optional<String> actual = objUnderTest.get(DUMMY_URL, String.class);
+
+        assertFalse(actual.isPresent());
+        verify(mockRestTemplate, atLeastOnce()).exchange(eq(DUMMY_URL), eq(HttpMethod.GET), any(HttpEntity.class),
+                eq(String.class));
+    }
+
+    @Test(expected = InvalidRestRequestException.class)
+    public void test_get_ThrowsInvalidRestRequestExceptionifHttpClientErrorExceptionWithHttpStatusBadRequest() {
+        assertGetErrorScenario(HttpStatus.BAD_REQUEST);
+
+    }
+
+    @Test(expected = InvalidRestRequestException.class)
+    public void test_get_ThrowsInvalidRestRequestExceptionifHttpClientErrorExceptionWithHttpStatusNotFoundHttpStatus() {
+        assertGetErrorScenario(HttpStatus.NOT_FOUND);
+    }
+
+    @Test(expected = RestProcessingException.class)
+    public void test_get_ThrowsInvalidRestRequestExceptionifHttpClientErrorExceptionOccured() {
+        final HttpRestServiceProvider objUnderTest = new HttpRestServiceProviderImpl(mockRestTemplate);
+
+        when(mockRestTemplate.exchange(eq(DUMMY_URL), eq(HttpMethod.GET), any(HttpEntity.class), eq(String.class)))
+                .thenThrow(HttpClientErrorException.class);
+
+        objUnderTest.get(DUMMY_URL, String.class);
+    }
+
+    @Test(expected = RestProcessingException.class)
+    public void test_get_ThrowsInvalidRestRequestExceptionifRestProcessingExceptionOccured() {
+        final HttpRestServiceProvider objUnderTest = new HttpRestServiceProviderImpl(mockRestTemplate);
+
+        when(mockRestTemplate.exchange(eq(DUMMY_URL), eq(HttpMethod.GET), any(HttpEntity.class), eq(String.class)))
+                .thenThrow(RestClientException.class);
+
+        objUnderTest.get(DUMMY_URL, String.class);
+    }
+
+    @Test
+    public void test_post_returnOptionalPresentIfResponseIsOKAndHasBody() {
+
+        final HttpRestServiceProvider objUnderTest = new HttpRestServiceProviderImpl(mockRestTemplate);
+
+        when(mockRestTemplate.exchange(eq(DUMMY_URL), eq(HttpMethod.POST), any(HttpEntity.class), eq(String.class)))
+                .thenReturn(mockEntity);
+
+        when(mockEntity.getStatusCode()).thenReturn(HttpStatus.OK);
+        when(mockEntity.hasBody()).thenReturn(true);
+        when(mockEntity.getBody()).thenReturn(BODY);
+
+        final Optional<String> actual = objUnderTest.post(BODY, DUMMY_URL, String.class);
+
+        assertTrue(actual.isPresent());
+        verify(mockRestTemplate, atLeastOnce()).exchange(eq(DUMMY_URL), eq(HttpMethod.POST), any(HttpEntity.class),
+                eq(String.class));
+    }
+
+    @Test
+    public void test_post_returnOptionalPresentIfResponseIsOKAndHasNoBody() {
+
+        final HttpRestServiceProvider objUnderTest = new HttpRestServiceProviderImpl(mockRestTemplate);
+
+        when(mockRestTemplate.exchange(eq(DUMMY_URL), eq(HttpMethod.POST), any(HttpEntity.class), eq(String.class)))
+                .thenReturn(mockEntity);
+
+        when(mockEntity.getStatusCode()).thenReturn(HttpStatus.OK);
+        when(mockEntity.hasBody()).thenReturn(false);
+
+        final Optional<String> actual = objUnderTest.post(BODY, DUMMY_URL, String.class);
+
+        assertFalse(actual.isPresent());
+        verify(mockRestTemplate, atLeastOnce()).exchange(eq(DUMMY_URL), eq(HttpMethod.POST), any(HttpEntity.class),
+                eq(String.class));
+    }
+
+
+    @Test
+    public void test_post_returnOptionalPresentIfResponseIsNotOKAndHasBody() {
+
+        final HttpRestServiceProvider objUnderTest = new HttpRestServiceProviderImpl(mockRestTemplate);
+
+        when(mockRestTemplate.exchange(eq(DUMMY_URL), eq(HttpMethod.POST), any(HttpEntity.class), eq(String.class)))
+                .thenReturn(mockEntity);
+
+        when(mockEntity.getStatusCode()).thenReturn(HttpStatus.PARTIAL_CONTENT);
+
+        final Optional<String> actual = objUnderTest.post(BODY, DUMMY_URL, String.class);
+
+        assertFalse(actual.isPresent());
+        verify(mockRestTemplate, atLeastOnce()).exchange(eq(DUMMY_URL), eq(HttpMethod.POST), any(HttpEntity.class),
+                eq(String.class));
+    }
+    
+    @Test(expected = InvalidRestRequestException.class)
+    public void test_post_ThrowsInvalidRestRequestExceptionifHttpClientErrorExceptionWithHttpStatusBadRequest() {
+        assertPostErrorScenario(HttpStatus.BAD_REQUEST);
+
+    }
+
+    @Test(expected = InvalidRestRequestException.class)
+    public void test_post_ThrowsInvalidRestRequestExceptionifHttpClientErrorExceptionWithHttpStatusNotFoundHttpStatus() {
+        assertPostErrorScenario(HttpStatus.NOT_FOUND);
+    }
+    
+    @Test(expected = RestProcessingException.class)
+    public void test_post_ThrowsInvalidRestRequestExceptionifHttpClientErrorExceptionOccured() {
+        final HttpRestServiceProvider objUnderTest = new HttpRestServiceProviderImpl(mockRestTemplate);
+
+        when(mockRestTemplate.exchange(eq(DUMMY_URL), eq(HttpMethod.POST), any(HttpEntity.class), eq(String.class)))
+                .thenThrow(HttpClientErrorException.class);
+
+        objUnderTest.post(BODY, DUMMY_URL, String.class);
+    }
+
+    @Test(expected = RestProcessingException.class)
+    public void test_post_ThrowsInvalidRestRequestExceptionifRestProcessingExceptionOccured() {
+        final HttpRestServiceProvider objUnderTest = new HttpRestServiceProviderImpl(mockRestTemplate);
+
+        when(mockRestTemplate.exchange(eq(DUMMY_URL), eq(HttpMethod.POST), any(HttpEntity.class), eq(String.class)))
+                .thenThrow(RestClientException.class);
+
+        objUnderTest.post(BODY, DUMMY_URL, String.class);
+    }
+
+    private void assertPostErrorScenario(final HttpStatus status) {
+        final HttpRestServiceProvider objUnderTest = new HttpRestServiceProviderImpl(mockRestTemplate);
+
+        final HttpClientErrorException errorException = new HttpClientErrorException(status);
+        when(mockRestTemplate.exchange(eq(DUMMY_URL), eq(HttpMethod.POST), any(HttpEntity.class), eq(String.class)))
+                .thenThrow(errorException);
+
+        objUnderTest.post(BODY, DUMMY_URL, String.class);
+    }
+
+    private void assertGetErrorScenario(final HttpStatus status) {
+        final HttpRestServiceProvider objUnderTest = new HttpRestServiceProviderImpl(mockRestTemplate);
+
+        final HttpClientErrorException errorException = new HttpClientErrorException(status);
+        when(mockRestTemplate.exchange(eq(DUMMY_URL), eq(HttpMethod.GET), any(HttpEntity.class), eq(String.class)))
+                .thenThrow(errorException);
+
+        objUnderTest.get(DUMMY_URL, String.class);
+    }
+
+}