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/**
* Copyright 2017 [ZTE] and others.
*
* 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.
*/
package org.onap.workflow.activitiext.restservicetask;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpMethod;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.alibaba.fastjson.JSON;
/**
* This static-class eases HTTP-method execution by self-managed fault-handling
* and automated Response-information processing
*/
public class LowLevelRestApi {
private static final Logger logger = LoggerFactory.getLogger(LowLevelRestApi.class);
// Local HttpClient used for every communication (Singleton implementation)
private static HttpClient httpClient = new HttpClient();
/**
* Executes a passed HttpMethod (Method type is either PUT, POST, GET or
* DELETE) and returns a HttpResponseMessage
*
* @param method
* Method to execute
* @return HttpResponseMessage which contains all information about the
* execution
*/
public static HttpResponseMessage executeHttpMethod(HttpMethod method) throws Exception {
HttpResponseMessage responseMessage = null;
try {
// Execute Request
LowLevelRestApi.httpClient.executeMethod(method);
responseMessage = LowLevelRestApi.extractResponseInformation(method);
logger.info("statusCode: {}", method.getStatusCode());
logger.info("responseBody: {}", method.getResponseBodyAsString());
} catch (Exception e) {
logger.error("visit interface failed!", e);
throw e;
} finally {
// Release Connection anyway
method.releaseConnection();
}
// Extract response information and return
return responseMessage;
}
/**
* Extracts the response information from an executed HttpMethod
*
* @param method
* Executed Method
* @return Packaged response information
*/
private static HttpResponseMessage extractResponseInformation(HttpMethod method) {
// Create and return HttpResponseMethod
HttpResponseMessage responseMessage = new HttpResponseMessage();
responseMessage.setStatusCode(method.getStatusCode());
try {
JSON json = (JSON) JSON.parse(method.getResponseBodyAsString());
responseMessage.setResponseBody(json);
json.toJSONString();
} catch (Exception e) {
logger.info("response is not a json!");
}
return responseMessage;
}
}
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