Initial OpenEcomp A&AI Rest Client commit.

Change-Id: Ic6949778061bdf141431c4b14ea2417da6aa1e57
Signed-off-by: Shwetank Dave <shwetank.dave@amdocs.com>

7 files changed, 1321 insertions, 0 deletions

diff --git a/src/main/java/org/openecomp/restclient/client/Headers.java b/src/main/java/org/openecomp/restclient/client/Headers.java
new file mode 100644
index 0000000..aac817e
--- /dev/null
+++ b/src/main/java/org/openecomp/restclient/client/Headers.java
@@ -0,0 +1,37 @@
+/**

+ * ============LICENSE_START=======================================================

+ * RestClient

+ * ================================================================================

+ * Copyright © 2017 AT&T Intellectual Property.

+ * Copyright © 2017 Amdocs

+ * 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=========================================================

+ *

+ * ECOMP and OpenECOMP are trademarks

+ * and service marks of AT&T Intellectual Property.

+ */

+package org.openecomp.restclient.client;

+

+public final class Headers {

+

+  public static final String FROM_APP_ID = "X-FromAppId";

+  public static final String TRANSACTION_ID = "X-TransactionId";

+  public static final String RESOURCE_VERSION = "resourceVersion";

+  public static final String ETAG = "ETag";

+  public static final String IF_MATCH = "If-Match";

+  public static final String IF_NONE_MATCH = "If-None-Match";

+  public static final String ACCEPT = "Accept";

+

+}

diff --git a/src/main/java/org/openecomp/restclient/client/OperationResult.java b/src/main/java/org/openecomp/restclient/client/OperationResult.java
new file mode 100644
index 0000000..c9d0f9c
--- /dev/null
+++ b/src/main/java/org/openecomp/restclient/client/OperationResult.java
@@ -0,0 +1,83 @@
+/**

+ * ============LICENSE_START=======================================================

+ * RestClient

+ * ================================================================================

+ * Copyright © 2017 AT&T Intellectual Property.

+ * Copyright © 2017 Amdocs

+ * 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=========================================================

+ *

+ * ECOMP and OpenECOMP are trademarks

+ * and service marks of AT&T Intellectual Property.

+ */

+package org.openecomp.restclient.client;

+

+import javax.ws.rs.core.MultivaluedMap;

+

+public class OperationResult {

+

+  private String result;

+  private String failureCause;

+  private int resultCode;

+  private MultivaluedMap<String, String> headers;

+

+  /**

+   * Get the HTTP headers of the response.

+   *

+   * @return the HTTP headers of the response.

+   */

+  public MultivaluedMap<String, String> getHeaders() {

+    return headers;

+  }

+

+  public void setHeaders(MultivaluedMap<String, String> headers) {

+    this.headers = headers;

+  }

+

+

+  public String getResult() {

+    return result;

+  }

+

+  public void setResult(String result) {

+    this.result = result;

+  }

+

+  public int getResultCode() {

+    return resultCode;

+  }

+

+  public String getFailureCause() {

+    return failureCause;

+  }

+

+  public void setFailureCause(String failureCause) {

+    this.failureCause = failureCause;

+  }

+

+  public void setResultCode(int resultCode) {

+    this.resultCode = resultCode;

+  }

+

+  public OperationResult() {

+    super();

+  }

+

+  @Override

+  public String toString() {

+    return "OperationResult [result=" + result + ", resultCode=" + resultCode + "]";

+  }

+

+}

diff --git a/src/main/java/org/openecomp/restclient/client/RestClient.java b/src/main/java/org/openecomp/restclient/client/RestClient.java
new file mode 100644
index 0000000..900c4e0
--- /dev/null
+++ b/src/main/java/org/openecomp/restclient/client/RestClient.java
@@ -0,0 +1,686 @@
+/**
+ * ============LICENSE_START=======================================================
+ * RestClient
+ * ================================================================================
+ * Copyright © 2017 AT&T Intellectual Property.
+ * Copyright © 2017 Amdocs
+ * 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=========================================================
+ *
+ * ECOMP and OpenECOMP are trademarks
+ * and service marks of AT&T Intellectual Property.
+ */
+package org.openecomp.restclient.client;
+
+import com.sun.jersey.api.client.Client;
+import com.sun.jersey.api.client.ClientResponse;
+import com.sun.jersey.api.client.WebResource;
+import com.sun.jersey.api.client.WebResource.Builder;
+import com.sun.jersey.core.util.MultivaluedMapImpl;
+
+import org.openecomp.cl.api.LogFields;
+import org.openecomp.cl.api.LogLine;
+import org.openecomp.cl.api.Logger;
+import org.openecomp.cl.eelf.LoggerFactory;
+import org.openecomp.cl.mdc.MdcContext;
+import org.openecomp.cl.mdc.MdcOverride;
+import org.openecomp.restclient.logging.RestClientMsgs;
+import org.openecomp.restclient.rest.RestClientBuilder;
+
+import java.io.ByteArrayOutputStream;
+import java.text.SimpleDateFormat;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.UUID;
+
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.MultivaluedMap;
+import javax.ws.rs.core.Response;
+
+
+/**
+ * This class provides a general client implementation that micro services can use for communicating
+ * with the endpoints via their exposed REST interfaces.
+ */
+public class RestClient {
+
+  /**
+   * This is a generic builder that is used for constructing the REST client that we will use to
+   * communicate with the REST endpoint.
+   */
+  private RestClientBuilder clientBuilder;
+
+  /**
+   * The low level instance of the REST client that will be used to communicate with the endpoint.
+   */
+  private Client restClient = null;
+
+  /** Standard logger for producing log statements. */
+  private Logger logger = LoggerFactory.getInstance().getLogger("AAIRESTClient");
+
+  /** Standard logger for producing metric statements. */
+  private Logger metricsLogger = LoggerFactory.getInstance().getMetricsLogger("AAIRESTClient");
+
+  private SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSXXX");
+
+  /** Reusable function call for GET REST operations. */
+  private final RestOperation getOp = new GetRestOperation();
+
+  /** Reusable function call for PUT REST operations. */
+  private final RestOperation putOp = new PutRestOperation();
+
+  /** Reusable function call for POST REST operations. */
+  private final RestOperation postOp = new PostRestOperation();
+
+  /** Reusable function call for DELETE REST operations. */
+  private final RestOperation deleteOp = new DeleteRestOperation();
+
+  /**
+   * Creates a new instance of the {@link RestClient}.
+   */
+  public RestClient() {
+    clientBuilder = new RestClientBuilder();
+  }
+
+
+  /**
+   * Creates a new instance of the {@link RestClient} using the supplied {@link RestClientBuilder}.
+   *
+   * @param rcBuilder - The REST client builder that this instance of the {@link RestClient} should
+   *        use.
+   */
+  public RestClient(RestClientBuilder rcBuilder) {
+    clientBuilder = rcBuilder;
+  }
+
+
+  /**
+   * Sets the flag to indicate whether or not validation should be performed against the host name
+   * of the server we are trying to communicate with.
+   *
+   * @parameter validate - Set to true to enable validation, false to disable
+   *
+   * @return The AAIRESTClient instance. This is useful for chaining parameter assignments.
+   */
+  public RestClient validateServerHostname(boolean validate) {
+    logger.debug("Set validate server hostname = " + validate);
+    clientBuilder.setValidateServerHostname(validate);
+    return this;
+  }
+
+
+  /**
+   * Sets the flag to indicate whether or not validation should be performed against the certificate
+   * chain.
+   *
+   * @parameter validate - Set to true to enable validation, false to disable.
+   *
+   * @return The AAIRESTClient instance. This is useful for chaining parameter assignments.
+   */
+  public RestClient validateServerCertChain(boolean validate) {
+    logger.debug("Set validate server certificate chain = " + validate);
+    clientBuilder.setValidateServerCertChain(validate);
+    return this;
+  }
+
+
+  /**
+   * Assigns the client certificate file to use.
+   *
+   * @param filename - The name of the certificate file.
+   *
+   * @return The AAIRESTClient instance. This is useful for chaining parameter assignments.
+   */
+  public RestClient clientCertFile(String filename) {
+    logger.debug("Set client certificate filename = " + filename);
+    clientBuilder.setClientCertFileName(filename);
+    return this;
+  }
+
+
+  /**
+   * Assigns the client certificate password to use.
+   *
+   * @param password - The certificate password.
+   *
+   * @return The AAIRESTClient instance. This is useful for chaining parameter assignments.
+   */
+  public RestClient clientCertPassword(String password) {
+    logger.debug("Set client certificate password = " + password);
+    clientBuilder.setClientCertPassword(password);
+    return this;
+  }
+
+
+  /**
+   * Assigns the name of the trust store file to use.
+   *
+   * @param filename - the name of the trust store file.
+   *
+   * @return The AAIRESTClient instance. This is useful for chaining parameter assignments.
+   */
+  public RestClient trustStore(String filename) {
+    logger.debug("Set trust store filename = " + filename);
+    clientBuilder.setTruststoreFilename(filename);
+    return this;
+  }
+
+
+  /**
+   * Assigns the connection timeout (in ms) to use when connecting to the target server.
+   *
+   * @param timeout - The length of time to wait in ms before timing out.
+   *
+   * @return The AAIRESTClient instance. This is useful for chaining parameter assignments.
+   */
+  public RestClient connectTimeoutMs(int timeout) {
+    logger.debug("Set connection timeout = " + timeout + " ms");
+    clientBuilder.setConnectTimeoutInMs(timeout);
+    return this;
+  }
+
+
+  /**
+   * Assigns the read timeout (in ms) to use when communicating with the target server.
+   *
+   * @param timeout The read timeout in milliseconds.
+   *
+   * @return The AAIRESTClient instance. This is useful for chaining parameter assignments.
+   */
+  public RestClient readTimeoutMs(int timeout) {
+    logger.debug("Set read timeout = " + timeout + " ms");
+    clientBuilder.setReadTimeoutInMs(timeout);
+    return this;
+  }
+
+  /**
+   * This method operates on a REST endpoint by submitting an HTTP operation request against the
+   * supplied URL.    
+   * This variant of the method will perform a requested number of retries in the event that the
+   * first request is unsuccessful.
+   *
+   * @param operation - the REST operation type to send to the url
+   * @param url - The REST endpoint to submit the REST request to.
+   * @param payload - They payload to provide in the REST request, if applicable
+   * @param headers - The headers that should be passed in the request
+   * @param contentType - The content type of the payload
+   * @param responseType - The expected format of the response.
+   * 
+   * @return The result of the REST request.
+   */
+  protected OperationResult processRequest(RestOperation operation, String url, String payload,
+      Map<String, List<String>> headers, MediaType contentType, MediaType responseType,
+      int numRetries) {
+
+
+    OperationResult result = null;
+
+    long startTimeInMs = System.currentTimeMillis();
+    for (int retryCount = 0; retryCount < numRetries; retryCount++) {
+
+      logger.info(RestClientMsgs.HTTP_REQUEST_WITH_RETRIES, url, Integer.toString(retryCount + 1));
+
+      // Submit our query to the AAI.
+      result = processRequest(operation, url, payload, headers, contentType, responseType);
+
+      // If the submission was successful then we're done.
+      if (Integer.toString(result.getResultCode()).charAt(0) == '2') {
+        logger.info(RestClientMsgs.HTTP_REQUEST_TIME_WITH_RETRIES,
+            Long.toString(System.currentTimeMillis() - startTimeInMs), url,
+            Integer.toString(retryCount));
+        return result;
+      }
+
+      // Our submission was unsuccessful...
+      try {
+        // Sleep between re-tries to be nice to the target system.
+        Thread.sleep(500);
+
+      } catch (InterruptedException e) {
+        logger.error(RestClientMsgs.HTTP_REQUEST_INTERRUPTED, url, e.getLocalizedMessage());
+        break;
+      }
+    }
+
+    // If we've gotten this far, then we failed all of our retries.
+    result.setResultCode(504);
+    result.setFailureCause(
+        "Failed to get a successful result " + "after multiple retries to target server");
+
+    return result;
+  }
+
+  /**
+   * This method operates on a REST endpoint by submitting an HTTP operation request against the
+   * supplied URL.
+   *
+   * @param operation - the REST operation type to send to the url
+   * @param url - The REST endpoint to submit the REST request to.
+   * @param payload - They payload to provide in the REST request, if applicable
+   * @param headers - The headers that should be passed in the request
+   * @param contentType - The content type of the payload
+   * @param responseType - The expected format of the response.
+   *
+   * @return The result of the REST request.
+   */
+  protected OperationResult processRequest(RestOperation operation, String url, String payload,
+      Map<String, List<String>> headers, MediaType contentType, MediaType responseType) {
+
+    ClientResponse clientResponse = null;
+    OperationResult operationResult = new OperationResult();
+    ByteArrayOutputStream baos = new ByteArrayOutputStream();
+
+    String requestType = operation.getRequestType().name();
+
+    // Grab the current time so that we can log how long the
+    // query took once we are done.
+    long startTimeInMs = System.currentTimeMillis();
+    MdcOverride override = new MdcOverride();
+    override.addAttribute(MdcContext.MDC_START_TIME, formatter.format(startTimeInMs));
+
+    logger.info(RestClientMsgs.HTTP_REQUEST, requestType, url);
+
+    try {
+
+      // Get a REST client instance for our request.
+      Client client = getClient();
+
+      // Debug log the request
+      debugRequest(url, payload, headers, responseType);
+
+      // Get a client request builder, and submit our GET request.
+      Builder builder = getClientBuilder(client, url, payload, headers, contentType, responseType);
+      clientResponse = operation.processOperation(builder);
+
+      populateOperationResult(clientResponse, operationResult);
+
+      // Debug log the response
+      debugResponse(operationResult, clientResponse.getHeaders());
+
+    } catch (Exception ex) {
+
+      logger.error(RestClientMsgs.HTTP_REQUEST_ERROR, requestType, url, ex.getLocalizedMessage());
+      operationResult.setResultCode(500);
+      operationResult.setFailureCause(
+          "Error during GET operation to AAI with message = " + ex.getLocalizedMessage());
+
+    } finally {
+
+      if (logger.isDebugEnabled()) {
+        logger.debug(baos.toString());
+      }
+
+      // Not every valid response code is actually represented by the Response.Status
+      // object, so we need to guard against missing codes, otherwise we throw null
+      // pointer exceptions when we try to generate our metrics logs...
+      Response.Status responseStatus =
+          Response.Status.fromStatusCode(operationResult.getResultCode());
+      String responseStatusCodeString = "";
+      if (responseStatus != null) {
+        responseStatusCodeString = responseStatus.toString();
+      }
+
+      metricsLogger.info(RestClientMsgs.HTTP_REQUEST_TIME,
+          new LogFields().setField(LogLine.DefinedFields.STATUS_CODE, responseStatusCodeString)
+              .setField(LogLine.DefinedFields.RESPONSE_CODE, operationResult.getResultCode())
+              .setField(LogLine.DefinedFields.RESPONSE_DESCRIPTION, operationResult.getResult()),
+          override, requestType, Long.toString(System.currentTimeMillis() - startTimeInMs), url);
+      logger.info(RestClientMsgs.HTTP_REQUEST_TIME, requestType,
+          Long.toString(System.currentTimeMillis() - startTimeInMs), url);
+      logger.info(RestClientMsgs.HTTP_RESPONSE, url,
+          operationResult.getResultCode() + " " + responseStatusCodeString);
+    }
+
+    return operationResult;
+  }
+
+  /**
+   * This method submits an HTTP PUT request against the supplied URL.
+   *
+   * @param url - The REST endpoint to submit the PUT request to.
+   * @param payload - the payload to send to the supplied URL
+   * @param headers - The headers that should be passed in the request
+   * @param contentType - The content type of the payload
+   * @param responseType - The expected format of the response.
+   *
+   * @return The result of the PUT request.
+   */
+  public OperationResult put(String url, String payload, Map<String, List<String>> headers,
+      MediaType contentType, MediaType responseType) {
+    return processRequest(putOp, url, payload, headers, contentType, responseType);
+  }
+
+  /**
+   * This method submits an HTTP POST request against the supplied URL.
+   *
+   * @param url - The REST endpoint to submit the POST request to.
+   * @param payload - the payload to send to the supplied URL
+   * @param headers - The headers that should be passed in the request
+   * @param contentType - The content type of the payload
+   * @param responseType - The expected format of the response.
+   *
+   * @return The result of the POST request.
+   */
+  public OperationResult post(String url, String payload, Map<String, List<String>> headers,
+      MediaType contentType, MediaType responseType) {
+    return processRequest(postOp, url, payload, headers, contentType, responseType);
+  }
+
+  /**
+   * This method submits an HTTP GET request against the supplied URL.
+   *
+   * @param url - The REST endpoint to submit the GET request to.
+   * @param headers - The headers that should be passed in the request
+   * @param responseType - The expected format of the response.
+   *
+   * @return The result of the GET request.
+   */
+  public OperationResult get(String url, Map<String, List<String>> headers,
+      MediaType responseType) {
+    return processRequest(getOp, url, null, headers, null, responseType);
+  }
+
+  /**
+   * This method submits an HTTP GET request against the supplied URL. 
+   * This variant of the method will perform a requested number of retries in the event that the
+   * first request is unsuccessful.
+   * 
+   * @param url - The REST endpoint to submit the GET request to.
+   * @param headers - The headers that should be passed in the request
+   * @param responseType - The expected format of the response.
+   * @param numRetries - The number of times to try resubmitting the request in the event of a
+   *        failure.
+   * 
+   * @return The result of the GET request.
+   */
+  public OperationResult get(String url, Map<String, List<String>> headers, MediaType responseType,
+      int numRetries) {
+    return processRequest(getOp, url, null, headers, null, responseType, numRetries);
+  }
+
+  /**
+   * This method submits an HTTP DELETE request against the supplied URL.
+   *
+   * @param url - The REST endpoint to submit the DELETE request to.
+   * @param headers - The headers that should be passed in the request
+   * @param responseType - The expected format of the response.
+   *
+   * @return The result of the DELETE request.
+   */
+  public OperationResult delete(String url, Map<String, List<String>> headers,
+      MediaType responseType) {
+    return processRequest(deleteOp, url, null, headers, null, responseType);
+  }
+
+  /**
+   * This method does a health check ("ping") against the supplied URL.
+   *
+   * @param url - The REST endpoint to attempt a health check.
+   * @param srcAppName - The name of the application using this client.
+   * @param destAppName - The name of the destination app.
+   *
+   * @return A boolean value. True if connection attempt was successful, false otherwise.
+   *
+   */
+  public boolean healthCheck(String url, String srcAppName, String destAppName) {
+    return healthCheck(url, srcAppName, destAppName, MediaType.TEXT_PLAIN_TYPE);
+
+  }
+
+  /**
+   * This method does a health check ("ping") against the supplied URL.
+   *
+   * @param url - The REST endpoint to attempt a health check.
+   * @param srcAppName - The name of the application using this client.
+   * @param destAppName - The name of the destination app.
+   * @param responseType - The response type.
+   *
+   * @return A boolean value. True if connection attempt was successful, false otherwise.
+   *
+   */
+  public boolean healthCheck(String url, String srcAppName, String destAppName,
+      MediaType responseType) {
+    MultivaluedMap<String, String> headers = new MultivaluedMapImpl();
+    headers.put(Headers.FROM_APP_ID, Arrays.asList(new String[] {srcAppName}));
+    headers.put(Headers.TRANSACTION_ID, Arrays.asList(new String[] {UUID.randomUUID().toString()}));
+
+    try {
+      logger.info(RestClientMsgs.HEALTH_CHECK_ATTEMPT, destAppName, url);
+      OperationResult result = get(url, headers, responseType);
+
+      if (result != null && result.getFailureCause() == null) {
+        logger.info(RestClientMsgs.HEALTH_CHECK_SUCCESS, destAppName, url);
+        return true;
+      } else {
+        logger.error(RestClientMsgs.HEALTH_CHECK_FAILURE, destAppName, url,
+            result.getFailureCause());
+        return false;
+      }
+    } catch (Exception e) {
+      logger.error(RestClientMsgs.HEALTH_CHECK_FAILURE, destAppName, url, e.getMessage());
+      return false;
+    }
+  }
+
+  /**
+   * This method constructs a client request builder that can be used for submitting REST requests
+   * to the supplied URL endpoint.
+   *
+   * @param client - The REST client we will be using to talk to the server.
+   * @param url - The URL endpoint that our request will be submitted to.
+   * @param headers - The headers that should be passed in the request
+   * @param contentType - the content type of the payload
+   * @param responseType - The expected format of the response.
+   *
+   * @return A client request builder.
+   */
+  private Builder getClientBuilder(Client client, String url, String payload,
+      Map<String, List<String>> headers, MediaType contentType, MediaType responseType) {
+
+    WebResource resource = client.resource(url);
+    Builder builder = null;
+
+    builder = resource.accept(responseType);
+
+    if (contentType != null) {
+      builder.type(contentType);
+    }
+
+    if (payload != null) {
+      builder.entity(payload);
+    }
+
+    if (headers != null) {
+      for (Entry<String, List<String>> header : headers.entrySet()) {
+        builder.header(header.getKey(), header.getValue());
+      }
+    }
+
+    return builder;
+  }
+
+  private void debugRequest(String url, String payload, Map<String, List<String>> headers,
+      MediaType responseType) {
+    if (logger.isDebugEnabled()) {
+      StringBuilder debugRequest = new StringBuilder("REQUEST:\n");
+      debugRequest.append("URL: ").append(url).append("\n");
+      debugRequest.append("Payload: ").append(payload).append("\n");
+      debugRequest.append("Response Type: ").append(responseType).append("\n");
+      if (headers != null) {
+        debugRequest.append("Headers: ");
+        for (Entry<String, List<String>> header : headers.entrySet()) {
+          debugRequest.append("\n\t").append(header.getKey()).append(":");
+          for (String headerEntry : header.getValue()) {
+            debugRequest.append("\"").append(headerEntry).append("\" ");
+          }
+        }
+      }
+      logger.debug(debugRequest.toString());
+    }
+  }
+
+  private void debugResponse(OperationResult operationResult,
+      MultivaluedMap<String, String> headers) {
+    if (logger.isDebugEnabled()) {
+      StringBuilder debugResponse = new StringBuilder("RESPONSE:\n");
+      debugResponse.append("Result: ").append(operationResult.getResultCode()).append("\n");
+      debugResponse.append("Failure Cause: ").append(operationResult.getFailureCause())
+          .append("\n");
+      debugResponse.append("Payload: ").append(operationResult.getResult()).append("\n");
+      if (headers != null) {
+        debugResponse.append("Headers: ");
+        for (Entry<String, List<String>> header : headers.entrySet()) {
+          debugResponse.append("\n\t").append(header.getKey()).append(":");
+          for (String headerEntry : header.getValue()) {
+            debugResponse.append("\"").append(headerEntry).append("\" ");
+          }
+        }
+      }
+      logger.debug(debugResponse.toString());
+    }
+  }
+
+
+  /**
+   * This method creates an instance of the low level REST client to use for communicating with the
+   * AAI, if one has not already been created, otherwise it returns the already created instance.
+   *
+   * @return A {@link Client} instance.
+   */
+  private synchronized Client getClient() throws Exception {
+
+    if (restClient == null) {
+
+      if (logger.isDebugEnabled()) {
+        logger.debug("Instantiating REST client with following parameters:");
+        logger.debug(
+            "  validate server hostname          = " + clientBuilder.isValidateServerHostname());
+        logger.debug(
+            "  validate server certificate chain = " + clientBuilder.isValidateServerCertChain());
+        logger.debug(
+            "  client certificate filename       = " + clientBuilder.getClientCertFileName());
+        logger.debug(
+            "  client certificate password       = " + clientBuilder.getClientCertPassword());
+        logger.debug(
+            "  trust store filename              = " + clientBuilder.getTruststoreFilename());
+        logger.debug("  connection timeout                = "
+            + clientBuilder.getConnectTimeoutInMs() + " ms");
+        logger.debug(
+            "  read timeout                      = " + clientBuilder.getReadTimeoutInMs() + " ms");
+      }
+
+      restClient = clientBuilder.getClient();
+    }
+
+    return restClient;
+  }
+
+
+  /**
+   * This method populates the fields of an {@link OperationResult} instance based on the contents
+   * of a {@link ClientResponse} received in response to a REST request.
+   */
+  private void populateOperationResult(ClientResponse response, OperationResult opResult) {
+
+    // If we got back a NULL response, then just produce a generic
+    // error code and result indicating this.
+    if (response == null) {
+      opResult.setResultCode(500);
+      opResult.setFailureCause("Client response was null");
+      return;
+    }
+
+    int statusCode = response.getStatus();
+    String payload = response.getEntity(String.class);
+
+    opResult.setResultCode(statusCode);
+
+    if ((statusCode < 200) || (statusCode > 299)) {
+      opResult.setFailureCause(payload);
+    } else {
+      opResult.setResult(payload);
+    }
+
+    opResult.setHeaders(response.getHeaders());
+  }
+
+  private class GetRestOperation implements RestOperation {
+    public ClientResponse processOperation(Builder builder) {
+      return builder.get(ClientResponse.class);
+    }
+
+    public RequestType getRequestType() {
+      return RequestType.GET;
+    }
+  }
+
+  private class PutRestOperation implements RestOperation {
+    public ClientResponse processOperation(Builder builder) {
+      return builder.put(ClientResponse.class);
+    }
+
+    public RequestType getRequestType() {
+      return RequestType.PUT;
+    }
+  }
+
+  private class PostRestOperation implements RestOperation {
+    public ClientResponse processOperation(Builder builder) {
+      return builder.post(ClientResponse.class);
+    }
+
+    public RequestType getRequestType() {
+      return RequestType.POST;
+    }
+  }
+
+  private class DeleteRestOperation implements RestOperation {
+    public ClientResponse processOperation(Builder builder) {
+      return builder.delete(ClientResponse.class);
+    }
+
+    public RequestType getRequestType() {
+      return RequestType.DELETE;
+    }
+  }
+
+  /**
+   * Interface used wrap a Jersey REST call using a functional interface.
+   */
+  private interface RestOperation {
+
+    /**
+     * Method used to wrap the functionality of making a REST call out to the endpoint.
+     *
+     * @param builder the Jersey builder used to make the request
+     * @return the response from the REST endpoint
+     */
+    public ClientResponse processOperation(Builder builder);
+
+    /**
+     * Returns the REST request type.
+     */
+    public RequestType getRequestType();
+
+    /**
+     * The supported REST request types.
+     */
+    public enum RequestType {
+      GET, PUT, POST, DELETE;
+    }
+  }
+}
diff --git a/src/main/java/org/openecomp/restclient/logging/RestClientMsgs.java b/src/main/java/org/openecomp/restclient/logging/RestClientMsgs.java
new file mode 100644
index 0000000..0b59139
--- /dev/null
+++ b/src/main/java/org/openecomp/restclient/logging/RestClientMsgs.java
@@ -0,0 +1,114 @@
+/**

+ * ============LICENSE_START=======================================================

+ * RestClient

+ * ================================================================================

+ * Copyright © 2017 AT&T Intellectual Property.

+ * Copyright © 2017 Amdocs

+ * 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=========================================================

+ *

+ * ECOMP and OpenECOMP are trademarks

+ * and service marks of AT&T Intellectual Property.

+ */

+package org.openecomp.restclient.logging;

+

+import com.att.eelf.i18n.EELFResourceManager;

+import org.openecomp.cl.eelf.LogMessageEnum;

+

+public enum RestClientMsgs implements LogMessageEnum {

+

+  /**

+   * Arguments: 

+   *    {0} = HTTP operation 

+   *    {1} = URL

+   */

+  HTTP_REQUEST,

+

+  /**

+   * Arguments: 

+   *    {0} = HTTP operation 

+   *    {1} = URL 

+   *    {2} = Attempt count.

+   */

+  HTTP_REQUEST_WITH_RETRIES,

+

+  /**

+   * Arguments: 

+   *    {0} = HTTP operation 

+   *    {1} - URL 

+   *    {2} - Operation time in ms.

+   */

+  HTTP_REQUEST_TIME,

+

+  /**

+   * Arguments: 

+   *    {0} = HTTP operation 

+   *    {1} - URL 

+   *    {2} - Operation time in ms. 

+   *    {3} - Retry count.

+   */

+  HTTP_REQUEST_TIME_WITH_RETRIES,

+

+  /**

+   * Arguments: 

+   *    {0} = HTTP operation 

+   *    {1} - URL 

+   *    {2} - Error message.

+   */

+  HTTP_REQUEST_INTERRUPTED,

+

+  /**

+   * Arguments: 

+   *    {0} = HTTP operation 

+   *    {1} - URL 

+   *    {2} - Error message.

+   */

+  HTTP_REQUEST_ERROR,

+

+  /**

+   * . Arguments: 

+   *    {0} = Target URL

+   */

+  HEALTH_CHECK_ATTEMPT,

+

+  /**

+   * . Arguments: 

+   *    {0} = Target URL

+   */

+  HEALTH_CHECK_SUCCESS,

+

+  /**

+   * . Arguments: 

+   *    {0} = Target URL 

+   *    {1} = failure cause

+   */

+  HEALTH_CHECK_FAILURE,

+

+

+  /**

+   * . Arguments: 

+   *    {0} = URL 

+   *    {1} - Response code

+   */

+  HTTP_RESPONSE;

+

+

+  /**

+   * Static initializer to ensure the resource bundles for this class are loaded...

+   */

+  static {

+    EELFResourceManager.loadMessageBundle("logging/RESTClientMsgs");

+  }

+}

diff --git a/src/main/java/org/openecomp/restclient/rest/HttpUtil.java b/src/main/java/org/openecomp/restclient/rest/HttpUtil.java
new file mode 100644
index 0000000..89af684
--- /dev/null
+++ b/src/main/java/org/openecomp/restclient/rest/HttpUtil.java
@@ -0,0 +1,115 @@
+/**

+ * ============LICENSE_START=======================================================

+ * RestClient

+ * ================================================================================

+ * Copyright © 2017 AT&T Intellectual Property.

+ * Copyright © 2017 Amdocs

+ * 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=========================================================

+ *

+ * ECOMP and OpenECOMP are trademarks

+ * and service marks of AT&T Intellectual Property.

+ */

+package org.openecomp.restclient.rest;

+

+public class HttpUtil {

+

+  /**

+   * Determines if the provided HTTP response is present in the provided list of acceptable response

+   * codes.

+   *

+   * @param response the http response we got from our request

+   * @param list the list of acceptable response codes

+   * @return true if the http response is in the provided list

+   */

+  public static boolean isHttpResponseInList(int response, int... list) {

+    for (int checkCode : list) {

+      if (checkCode == response) {

+        return true;

+      }

+    }

+    return false;

+  }

+

+  /**

+   * Determines if the provided http response is of the information class.

+   *

+   * @param response the http response we got from our request

+   * @return true if the response is of the informational class and false otherwise

+   */

+  public static boolean isHttpResponseClassInformational(int response) {

+    return isExpectedHttpResponseClass(response, '1');

+  }

+

+  /**

+   * Determines if the provided http response is of the success class.

+   *

+   * @param response the http response we got from our request

+   * @return true if the response is of the success class and false otherwise

+   */

+  public static boolean isHttpResponseClassSuccess(int response) {

+    return isExpectedHttpResponseClass(response, '2');

+  }

+

+  /**

+   * Determines if the provided http response is of the redirection class.

+   *

+   * @param response the http response we got from our request

+   * @return true if the response is of the redirection class and false otherwise

+   */

+  public static boolean isHttpResponseClassRedirection(int response) {

+    return isExpectedHttpResponseClass(response, '3');

+  }

+

+  /**

+   * Determines if the provided http response is of the client error class.

+   *

+   * @param response the http response we got from our request

+   * @return true if the response is of the client error class and false otherwise

+   */

+  public static boolean isHttpResponseClassClientError(int response) {

+    return isExpectedHttpResponseClass(response, '4');

+  }

+

+  /**

+   * Determines if the provided http response is of the server error class.

+   *

+   * @param response the http response we got from our request

+   * @return true if the response is of the server error class and false otherwise

+   */

+  public static boolean isHttpResponseClassServerError(int response) {

+    return isExpectedHttpResponseClass(response, '5');

+  }

+

+  /**

+   * Helper method to determine if we have received the response class we are expecting.

+   *

+   * @param response the http response we got from our request

+   * @param expectedClass the expected http response class ie: 1, 2, 3, 4, 5 which maps to 1xx, 2xx,

+   *        3xx, 4xx, 5xx respectively

+   * @return true if the response if of our expected class and false if not

+   */

+  private static boolean isExpectedHttpResponseClass(int response, char expectedClass) {

+    if (response < 100 || response >= 600) {

+      return false;

+    }

+

+    if (Integer.toString(response).charAt(0) == expectedClass) {

+      return true;

+    }

+

+    return false;

+  }

+}

diff --git a/src/main/java/org/openecomp/restclient/rest/RestClientBuilder.java b/src/main/java/org/openecomp/restclient/rest/RestClientBuilder.java
new file mode 100644
index 0000000..3d546fe
--- /dev/null
+++ b/src/main/java/org/openecomp/restclient/rest/RestClientBuilder.java
@@ -0,0 +1,229 @@
+/**

+ * ============LICENSE_START=======================================================

+ * RestClient

+ * ================================================================================

+ * Copyright © 2017 AT&T Intellectual Property.

+ * Copyright © 2017 Amdocs

+ * 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=========================================================

+ *

+ * ECOMP and OpenECOMP are trademarks

+ * and service marks of AT&T Intellectual Property.

+ */

+package org.openecomp.restclient.rest;

+

+import com.sun.jersey.api.client.Client;

+import com.sun.jersey.api.client.config.ClientConfig;

+import com.sun.jersey.api.client.config.DefaultClientConfig;

+import com.sun.jersey.client.urlconnection.HTTPSProperties;

+

+import java.io.FileInputStream;

+import java.security.KeyStore;

+import java.security.cert.X509Certificate;

+

+import javax.net.ssl.HostnameVerifier;

+import javax.net.ssl.KeyManagerFactory;

+import javax.net.ssl.SSLContext;

+import javax.net.ssl.SSLSession;

+import javax.net.ssl.TrustManager;

+import javax.net.ssl.X509TrustManager;

+

+/**

+ * This is a generic REST Client builder with flexible security validation. Sometimes it's nice to

+ * be able to disable server chain cert validation and hostname validation to work-around lab

+ * issues, but at the same time be able to provide complete validation with client cert + hostname +

+ * server cert chain validation.  

+ * I used the ModelLoader REST client as a base and merged in the TSUI client I wrote which also

+ * validates the server hostname and server certificate chain.

+ * 

+ * @author DAVEA

+ *

+ */

+public class RestClientBuilder {

+

+  public static final boolean DEFAULT_VALIDATE_SERVER_HOST = false;

+  public static final boolean DEFAULT_VALIDATE_CERT_CHAIN = false;

+  public static final String DEFAULT_CLIENT_CERT_FILENAME = null;

+  public static final String DEFAULT_CERT_PASSWORD = null;

+  public static final String DEFAULT_TRUST_STORE_FILENAME = null;

+  public static final int DEFAULT_CONNECT_TIMEOUT_MS = 60000;

+  public static final int DEFAULT_READ_TIMEOUT_MS = 60000;

+

+  private static final String SSL_PROTOCOL = "TLS";

+  private static final String KEYSTORE_ALGORITHM = "SunX509";

+  private static final String KEYSTORE_TYPE = "PKCS12";

+

+  /*

+   * TODO: implement fluent interface?

+   */

+

+  private boolean validateServerHostname;

+  private boolean validateServerCertChain;

+  private String clientCertFileName;

+  private String clientCertPassword;

+  private String truststoreFilename;

+  private int connectTimeoutInMs;

+  private int readTimeoutInMs;

+

+  /**

+   * Rest Client Builder.

+   */

+  public RestClientBuilder() {

+    validateServerHostname = DEFAULT_VALIDATE_SERVER_HOST;

+    validateServerCertChain = DEFAULT_VALIDATE_CERT_CHAIN;

+    clientCertFileName = DEFAULT_CLIENT_CERT_FILENAME;

+    clientCertPassword = DEFAULT_CERT_PASSWORD;

+    truststoreFilename = DEFAULT_TRUST_STORE_FILENAME;

+    connectTimeoutInMs = DEFAULT_CONNECT_TIMEOUT_MS;

+    readTimeoutInMs = DEFAULT_READ_TIMEOUT_MS;

+  }

+

+  public boolean isValidateServerHostname() {

+    return validateServerHostname;

+  }

+

+  public void setValidateServerHostname(boolean validateServerHostname) {

+    this.validateServerHostname = validateServerHostname;

+  }

+

+  public boolean isValidateServerCertChain() {

+    return validateServerCertChain;

+  }

+

+  public void setValidateServerCertChain(boolean validateServerCertChain) {

+    this.validateServerCertChain = validateServerCertChain;

+  }

+

+  public String getClientCertFileName() {

+    return clientCertFileName;

+  }

+

+  public void setClientCertFileName(String clientCertFileName) {

+    this.clientCertFileName = clientCertFileName;

+  }

+

+  public String getClientCertPassword() {

+    return clientCertPassword;

+  }

+

+  public void setClientCertPassword(String clientCertPassword) {

+    this.clientCertPassword = clientCertPassword;

+  }

+

+  public String getTruststoreFilename() {

+    return truststoreFilename;

+  }

+

+  public void setTruststoreFilename(String truststoreFilename) {

+    this.truststoreFilename = truststoreFilename;

+  }

+

+  public int getConnectTimeoutInMs() {

+    return connectTimeoutInMs;

+  }

+

+  public void setConnectTimeoutInMs(int connectTimeoutInMs) {

+    this.connectTimeoutInMs = connectTimeoutInMs;

+  }

+

+  public int getReadTimeoutInMs() {

+    return readTimeoutInMs;

+  }

+

+  public void setReadTimeoutInMs(int readTimeoutInMs) {

+    this.readTimeoutInMs = readTimeoutInMs;

+  }

+

+  /**

+   * Returns Client.

+   */

+  public Client getClient() throws Exception {

+

+    ClientConfig clientConfig = new DefaultClientConfig();

+

+    // Check to see if we need to perform proper validation of

+    // the certificate chains.

+    TrustManager[] trustAllCerts = null;

+    if (validateServerCertChain) {

+      if (truststoreFilename != null) {

+        System.setProperty("javax.net.ssl.trustStore", truststoreFilename);

+      } else {

+        throw new IllegalArgumentException("Trust store filename must be set!");

+      }

+

+    } else {

+

+      // We aren't validating certificates, so create a trust manager that does

+      // not validate certificate chains.

+      trustAllCerts = new TrustManager[] {new X509TrustManager() {

+        public X509Certificate[] getAcceptedIssuers() {

+          return null;

+        }

+

+        public void checkClientTrusted(X509Certificate[] certs, String authType) {}

+

+        public void checkServerTrusted(X509Certificate[] certs, String authType) {}

+      }};

+    }

+

+    // Set up the SSL context, keystore, etc. to use for our connection

+    // to the AAI.

+    SSLContext ctx = SSLContext.getInstance(SSL_PROTOCOL);

+    KeyManagerFactory kmf = KeyManagerFactory.getInstance(KEYSTORE_ALGORITHM);

+    KeyStore ks = KeyStore.getInstance(KEYSTORE_TYPE);

+

+    char[] pwd = null;

+    if (clientCertPassword != null) {

+      pwd = clientCertPassword.toCharArray();

+    }

+

+    if (clientCertFileName != null) {

+      FileInputStream fin = new FileInputStream(clientCertFileName);

+

+      // Load the keystore and initialize the key manager factory.

+      ks.load(fin, pwd);

+      kmf.init(ks, pwd);

+

+      ctx.init(kmf.getKeyManagers(), trustAllCerts, null);

+    } else {

+      ctx.init(null, trustAllCerts, null);

+    }

+

+

+    // Are we performing validation of the server host name?

+    if (validateServerHostname) {

+      clientConfig.getProperties().put(HTTPSProperties.PROPERTY_HTTPS_PROPERTIES,

+          new HTTPSProperties(null, ctx));

+

+    } else {

+      clientConfig.getProperties().put(HTTPSProperties.PROPERTY_HTTPS_PROPERTIES,

+          new HTTPSProperties(new HostnameVerifier() {

+            @Override

+            public boolean verify(String str, SSLSession sslSession) {

+              return true;

+            }

+          }, ctx));

+    }

+

+    // Finally, create and initialize our client...

+    Client client = null;

+    client = Client.create(clientConfig);

+    client.setConnectTimeout(connectTimeoutInMs);

+    client.setReadTimeout(readTimeoutInMs);

+

+    // ...and return it to the caller.

+    return client;

+  }

+}

diff --git a/src/main/resources/logging/RESTClientMsgs.properties b/src/main/resources/logging/RESTClientMsgs.properties
new file mode 100644
index 0000000..9df0764
--- /dev/null
+++ b/src/main/resources/logging/RESTClientMsgs.properties
@@ -0,0 +1,57 @@
+#Resource key=Error Code|Message text|Resolution text |Description text
+#######
+#Newlines can be utilized to add some clarity ensuring continuing line
+#has atleast one leading space
+#ResourceKey=\
+#             ERR0000E\
+#             Sample error msg txt\
+#             Sample resolution msg\
+#             Sample description txt
+#
+######
+#Error code classification category
+#000    Info/Debug
+#100    Permission errors
+#200    Availability errors/Timeouts
+#300    Data errors
+#400    Schema Interface type/validation errors
+#500    Business process errors
+#900    Unknown errors
+#
+########################################################################
+
+HTTP_REQUEST=\
+    AC0001I|\
+    {0} request at url = {1}
+
+HTTP_REQUEST_WITH_RETRIES=\
+    AC0002I|\
+    {0} request at url = {1} attempt number = {2}
+
+HTTP_REQUEST_TIME=\
+    AC0003I|\
+    {0} request operation time = {1} ms for link = {2}
+
+HTTP_RESPONSE=\
+    AC0004I|\
+    request at url = {0} resulted in http response: {1}
+    
+HEALTH_CHECK_ATTEMPT=\
+    AC0005I|\
+    Attempting to connect to {0} at {1}
+
+HEALTH_CHECK_SUCCESS=\
+    AC0006I|\
+    Successfully established connection to {0} at {1}
+
+HTTP_REQUEST_INTERRUPTED=\
+    AC2001E|\
+    {0} request interrupted while sleeping at url = {1} with cause = {2}
+
+HTTP_REQUEST_ERROR=\
+    AC2002E|\
+    Error during {0} operation to endpoint at url = {1} with error = {2}
+
+HEALTH_CHECK_FAILURE=\
+    AC2003E|\
+    Failed to establish connection to {0} at {1}. Cause {2}