CosmService.java

/**
 * Copyright (c) 2010-2016 by the respective copyright holders.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package org.openhab.persistence.cosm.internal;

import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Map;

import org.apache.commons.lang.StringUtils;
import org.openhab.core.items.Item;
import org.openhab.core.persistence.PersistenceService;
import org.osgi.framework.BundleContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import flexjson.JSONSerializer;

/**
 * This is the implementation of the Cosm {@link PersistenceService}. To learn
 * more about Cosm please visit their <a href="http://cosm.com/">website</a>.
 *
 * @author Dmitry Krasnov
 * @since 1.1.0
 */
public class CosmService implements PersistenceService {

    private static final Logger logger = LoggerFactory.getLogger(CosmService.class);

    private String apiKey;
    private String url;

    private final static String DEFAULT_EVENT_URL = "http://api.cosm.com/v2/feeds/";

    private boolean initialized = false;

    /**
     * @{inheritDoc}
     */
    public String getName() {
        return "cosm";
    }

    /**
     * @{inheritDoc}
     */
    public void store(Item item, String alias) {
        if (initialized) {
            try {
                String serviceUrl = url;
                if (alias == null) {
                    alias = item.getName();
                }
                serviceUrl += "/" + alias;
                URL url = new URL(serviceUrl);
                HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
                httpCon.setDoOutput(true);
                httpCon.setRequestMethod("PUT");
                httpCon.setRequestProperty("Content-type", "application/json");
                httpCon.setRequestProperty("X-ApiKey", apiKey);
                OutputStreamWriter out = new OutputStreamWriter(httpCon.getOutputStream());

                JSONSerializer serializer = new JSONSerializer().transform(new CosmEventTransformer(),
                        CosmEventBean.class);
                String serializedBean = serializer.serialize(new CosmEventBean(alias, item.getState().toString()));

                out.write(serializedBean);
                out.flush();
                logger.debug("Stored item '{}' as '{}' in Cosm and received response: {} ",
                        new String[] { item.getName(), alias, httpCon.getResponseMessage() });
                out.close();
            } catch (Exception e) {
                logger.warn("Connection error");
            }
        }
    }

    /**
     * @{inheritDoc}
     */
    public void store(Item item) {
        throw new UnsupportedOperationException(
                "The cosm service requires aliases for persistence configurations that should match the id within the feed");
    }

    /**
     * @{inheritDoc}
     */
    public void activate(final BundleContext bundleContext, final Map<String, Object> config) {
        if (config != null) {

            url = (String) config.get("url");
            if (StringUtils.isBlank(url)) {
                url = DEFAULT_EVENT_URL;
            }

            apiKey = (String) config.get("apikey");
            if (StringUtils.isBlank(apiKey)) {
                logger.warn("The Cosm API-Key is missing - please configure it in openhab.cfg");
            }

            initialized = true;
        }
    }

}