de.pubflow.server.core.restConnection.WorkflowSender.java Source code

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Here is the source code for de.pubflow.server.core.restConnection.WorkflowSender.java

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/**
 * Copyright (C) 2016 Marc Adolf, Arnd Plumhoff (http://www.pubflow.uni-kiel.de/)
 *
 * 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 de.pubflow.server.core.restConnection;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClientBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.gson.Gson;

import de.pubflow.server.common.exceptions.WFRestException;
import de.pubflow.server.core.rest.messages.WorkflowRestCall;

/**
 * The WorkflowSender is responsible for the outgoing communication with the
 * Workflow engine.
 * 
 * @author Marc Adolf
 *
 */
public class WorkflowSender {

    /**
     * Sends a post request to the Workflow engine to use a certain Workflow
     * specified through the given path.
     * 
     * @param wfCall
     *            The message with all necessary informations to create a new
     *            Workflow
     * @param workflowPath
     *            The path for the specific Workflow to be used.
     * @throws WFRestException
     *             if the connection responses with a HTTP response code other
     *             than 2xx
     */
    public static void initWorkflow(WorkflowRestCall wfCall, String workflowPath) throws WFRestException {
        Logger myLogger = LoggerFactory.getLogger(WorkflowSender.class);

        myLogger.info("Trying to use workflow on: " + workflowPath);
        Gson gson = new Gson();
        HttpClient httpClient = HttpClientBuilder.create().build();
        HttpPost post = new HttpPost(workflowPath);
        HttpResponse response = null;

        try {
            StringEntity postingString = new StringEntity(gson.toJson(wfCall), ContentType.APPLICATION_JSON);

            post.setEntity(postingString);
            post.setHeader("Content-type", "application/json;charset=utf-8");
            response = httpClient.execute(post);
            System.out.println(post.getURI());
            myLogger.info("Http response: " + response.toString());

        } catch (Exception e) {
            myLogger.error("Could not deploy new Workflow with ID: " + wfCall.getID());
            myLogger.error(e.toString());
            throw new WFRestException("Workflow could not be started");
        }
        if (response.getStatusLine().getStatusCode() >= 300) {
            throw new WFRestException(
                    "The called WorkflowService send status code: " + response.getStatusLine().getStatusCode()
                            + " and error: " + response.getStatusLine().getReasonPhrase());
        }

    }

}