eu.eco2clouds.accounting.bonfire.BFClientAccountingImpl.java Source code

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Here is the source code for eu.eco2clouds.accounting.bonfire.BFClientAccountingImpl.java

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package eu.eco2clouds.accounting.bonfire;

import java.io.IOException;
import java.io.StringReader;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;

import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
import org.apache.log4j.Logger;

import eu.eco2clouds.accounting.Dictionary;
import eu.eco2clouds.accounting.conf.Configuration;
import eu.eco2clouds.accounting.http.HCClientFactory;
import eu.eco2clouds.api.bonfire.occi.datamodel.Experiment;

/**
 * 
 * Copyright 2014 ATOS SPAIN S.A. 
 * 
 * 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.
 * 
 * @author: David Garcia Perez. Atos Research and Innovation, Atos SPAIN SA
 * e-mail david.garciaperez@atos.net
 */
public class BFClientAccountingImpl implements BFClientAccounting {
    private static Logger logger = Logger.getLogger(BFClientAccountingImpl.class);
    protected String url;
    protected String userId;
    protected String groupId;
    private HttpClient httpClient;

    public BFClientAccountingImpl() {
        url = Configuration.bonfireAPIUrl;
        groupId = Configuration.bonfireApiGroup;
    }

    @Override
    public Experiment getExperiment(String userId, long experimentId) {
        this.userId = userId;
        Boolean exception = false;
        String experimentUrl = url + "/experiments/" + experimentId;

        String response = getMethod(experimentUrl, exception);
        logger.debug(response);

        Experiment experiment = new Experiment();

        try {
            JAXBContext jaxbContext = JAXBContext.newInstance(Experiment.class);
            Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
            experiment = (Experiment) jaxbUnmarshaller.unmarshal(new StringReader(response));
        } catch (JAXBException e) {
            logger.warn("Error trying to parse returned status of hosts: " + experimentUrl + " Exception: "
                    + e.getMessage());
            exception = true;
        }

        if (exception)
            return new Experiment();
        return experiment;
    }

    private String getMethod(String url, Boolean exception) {
        // Create an instance of HttpClient.
        HttpClient client = getHttpClient();

        logger.debug("Connecting to: " + url);
        // Create a method instance.
        GetMethod method = new GetMethod(url);
        setHeaders(method);

        // Provide custom retry handler is necessary
        method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,
                new DefaultHttpMethodRetryHandler(3, false));

        String response = "";

        try {
            // Execute the method.
            int statusCode = client.executeMethod(method);

            if (statusCode != HttpStatus.SC_OK) { //TODO test for this case... 
                logger.warn(
                        "get managed experiments information... : " + url + " failed: " + method.getStatusLine());
            } else {
                // Read the response body.
                byte[] responseBody = method.getResponseBody();
                response = new String(responseBody);
            }

        } catch (HttpException e) {
            logger.warn("Fatal protocol violation: " + e.getMessage());
            e.printStackTrace();
            exception = true;
        } catch (IOException e) {
            logger.warn("Fatal transport error: " + e.getMessage());
            e.printStackTrace();
            exception = true;
        } finally {
            // Release the connection.
            method.releaseConnection();
        }

        return response;
    }

    private HttpClient getHttpClient() {
        if (httpClient == null) {
            httpClient = HCClientFactory.getHttpClient();
        }

        return httpClient;
    }

    private void setHeaders(HttpMethod method) {
        method.addRequestHeader(Dictionary.X_BONFIRE_ASSERTED_ID, userId);
        method.addRequestHeader(Dictionary.X_BONFIRE_GROUPS_ID, groupId);
        method.addRequestHeader("User-Agent", Dictionary.USER_AGENT);
        method.addRequestHeader("Accept", Dictionary.ACCEPT);
    }

}