org.jboss.set.aphrodite.JsonStreamService.java Source code

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Here is the source code for org.jboss.set.aphrodite.JsonStreamService.java

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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2015, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.jboss.set.aphrodite;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jboss.set.aphrodite.common.Utils;
import org.jboss.set.aphrodite.domain.Codebase;
import org.jboss.set.aphrodite.domain.Repository;
import org.jboss.set.aphrodite.domain.Stream;
import org.jboss.set.aphrodite.domain.StreamComponent;
import org.jboss.set.aphrodite.spi.NotFoundException;
import org.jboss.set.aphrodite.spi.StreamService;

import java.io.FileInputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;

import javax.json.Json;
import javax.json.JsonArray;
import javax.json.JsonException;
import javax.json.JsonObject;
import javax.json.JsonReader;
import javax.json.JsonValue;

/**
 * A stream service which reads stream date from the specified JSON file.  This implementation
 * assumes that streams are written in order in the json file, i.e. the most recent (upstream) issue
 * is specified as the first JSON object in the "streams" JSON array. An example JSON file can be
 * found at https://github.com/jboss-set/jboss-streams
 *
 * @author Ryan Emerson
 */
public class JsonStreamService implements StreamService {
    private static final String FILE_PROPERTY = "streams.json";
    private static final Log LOG = LogFactory.getLog(JsonStreamService.class);

    private final Map<String, Stream> streamMap = new HashMap<>();
    private final String jsonFileLocation;
    private final Aphrodite aphrodite;
    private boolean streamsAreLoaded = false;

    public JsonStreamService(Aphrodite aphrodite) {
        this(aphrodite, System.getProperty(FILE_PROPERTY));
    }

    public JsonStreamService(Aphrodite aphrodite, String jsonFileLocation) {
        this.aphrodite = aphrodite;
        this.jsonFileLocation = jsonFileLocation;
    }

    @Override
    public List<Stream> getStreams() {
        checkStreamsLoaded();
        return new ArrayList<>(streamMap.values());
    }

    @Override
    public Stream getStream(String streamName) {
        checkStreamsLoaded();
        return streamMap.get(streamName);
    }

    public void loadStreamData() throws NotFoundException {
        try (JsonReader jr = Json.createReader(new FileInputStream(jsonFileLocation))) {
            parseJson(jr.readObject());
        } catch (IOException e) {
            Utils.logException(LOG, "Unable to load file: " + jsonFileLocation, e);
        } catch (JsonException e) {
            Utils.logException(LOG, e);
        }
        streamsAreLoaded = true;
    }

    private void parseJson(JsonObject jsonObject) throws NotFoundException {
        JsonArray jsonArray = jsonObject.getJsonArray("streams");
        Objects.requireNonNull(jsonArray, "streams array must be specified in json file");

        for (JsonValue value : jsonArray) {
            JsonObject json = (JsonObject) value;

            String upstreamName = json.getString("upstream", null);
            Stream upstream = streamMap.get(upstreamName);

            JsonArray codebases = json.getJsonArray("codebases");
            Map<String, StreamComponent> codebaseMap = parseStreamCodebases(codebases);

            Stream currentStream = new Stream(json.getString("name"), upstream, codebaseMap);
            streamMap.put(currentStream.getName(), currentStream);
        }
    }

    private Map<String, StreamComponent> parseStreamCodebases(JsonArray codebases) throws NotFoundException {
        Map<String, StreamComponent> codebaseMap = new HashMap<>();
        for (JsonValue value : codebases) {
            JsonObject json = (JsonObject) value;
            String componentName = json.getString("component_name");
            String codebaseName = json.getString("codebase");
            URL repositoryUrl = parseUrl(json.getString("repository_url"));

            Repository repository = aphrodite.getRepository(repositoryUrl);
            Codebase codebase = new Codebase(codebaseName);

            if (!repository.getCodebases().contains(codebase))
                throw new NotFoundException("The specified codebase '" + codebaseName + "' "
                        + "does not belong to the Repository at " + repository.getURL());

            StreamComponent component = new StreamComponent(componentName, repository, codebase);
            codebaseMap.put(component.getName(), component);
        }
        return codebaseMap;
    }

    private URL parseUrl(String url) {
        try {
            return new URL(url);
        } catch (MalformedURLException e) {
            throw new JsonException("Unable to parse url: " + e.getMessage());
        }
    }

    private void checkStreamsLoaded() {
        if (!streamsAreLoaded)
            Utils.logWarnMessage(LOG, "Stream data has not yet been loaded, you must call "
                    + "'JsonStreamService.loadStreamData()' before calling StreamService methods.");
    }
}