uk.dsxt.voting.common.registries.RegistriesServerWeb.java Source code

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Here is the source code for uk.dsxt.voting.common.registries.RegistriesServerWeb.java

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/******************************************************************************
 * e-voting system                                                            *
 * Copyright (C) 2016 DSX Technologies Limited.                               *
 * *
 * This program is free software; you can redistribute it and/or modify       *
 * it under the terms of the GNU General Public License as published by       *
 * the Free Software Foundation; either version 2 of the License, or          *
 * (at your option) any later version.                                        *
 * *
 * This program is distributed in the hope that it will be useful,            *
 * but WITHOUT ANY WARRANTY; without even the implied                         *
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.           *
 * See the GNU General Public License for more details.                       *
 * *
 * You can find copy of the GNU General Public License in LICENSE.txt file    *
 * at the top-level directory of this distribution.                           *
 * *
 * Removal or modification of this copyright notice is prohibited.            *
 * *
 ******************************************************************************/

package uk.dsxt.voting.common.registries;

import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.Value;
import lombok.extern.log4j.Log4j2;
import uk.dsxt.voting.common.domain.dataModel.Participant;
import uk.dsxt.voting.common.utils.web.HttpHelper;
import uk.dsxt.voting.common.utils.InternalLogicException;
import uk.dsxt.voting.common.utils.web.RequestType;

import java.net.ConnectException;

@Log4j2
@Value
public class RegistriesServerWeb implements RegistriesServer {
    private static final String PARTICIPANTS_URL_PART = "/participants";

    public static final String EMPTY_ERROR = "Empty answer";
    public static final String INTERNAL_LOGIC_ERROR = "Internal logic exception";
    public static final String UNKNOWN_ERROR = "Unknown exception";

    private final ObjectMapper mapper = new ObjectMapper();

    private final HttpHelper httpHelper;

    private final String participantUrl;

    public RegistriesServerWeb(String baseUrl, int connectionTimeout, int readTimeout) {
        participantUrl = String.format("%s%s", baseUrl, PARTICIPANTS_URL_PART);

        httpHelper = new HttpHelper(connectionTimeout, readTimeout);
    }

    private <T> T execute(String name, String url, Class<T> clazz) {
        try {
            while (!Thread.currentThread().isInterrupted()) {
                try {
                    String answer = httpHelper.request(url, RequestType.GET);
                    T value = mapper.readValue(answer, clazz);
                    if (value != null)
                        return value;
                    log.error("{} failed. value is null. url={}", name, url);
                } catch (InternalLogicException e) {
                    log.error("{} failed. Logic exception. url={}. Reason: {}", name, url, e.getMessage());
                } catch (ConnectException connEx) {
                    log.error("{} failed. Couldn't establish connection. url={}. Reason: {}", name, url,
                            connEx.getMessage());
                } catch (Exception ex) {
                    log.error(String.format("%s failed. url=%s", name, url), ex);
                }
                Thread.sleep(1000);
            }
        } catch (InterruptedException e) {
            log.error("{} failed. InterruptedException. url={}", name, url);
        }
        return null;
    }

    @Override
    public Participant[] getParticipants() {
        return execute("getParticipants", participantUrl, Participant[].class);
    }
}