com.seanbright.osgi.launcher.Daemon.java Source code

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Here is the source code for com.seanbright.osgi.launcher.Daemon.java

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/*
 * Copyright (C) 2014, Sean Bright. All Rights Reserved.
 *
 * 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 com.seanbright.osgi.launcher;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import org.apache.commons.daemon.DaemonContext;
import org.apache.commons.daemon.DaemonInitException;
import org.osgi.framework.launch.FrameworkFactory;
import com.seanbright.osgi.launcher.util.PropertiesParser;

public class Daemon implements org.apache.commons.daemon.Daemon {
    private DaemonContext context;
    private FrameworkFactory factory;
    private FrameworkThread thread;

    private Map<String, String> frameworkProps;

    @Override
    public void init(DaemonContext context) throws DaemonInitException, Exception {
        this.context = context;

        frameworkProps = loadFrameworkProperties(
                context.getArguments().length == 0 ? "framework.properties" : context.getArguments()[0]);

        factory = FrameworkFactories.get();
    }

    @Override
    public void start() throws Exception {
        // Find and launch a framework
        thread = new FrameworkThread(context, factory, frameworkProps);

        thread.start();
    }

    @Override
    public void stop() throws Exception {
        thread.shutdown();
        thread.join();
        thread = null;
    }

    @Override
    public void destroy() {
    }

    public static void main(String[] args) throws Exception {
        Daemon d = new Daemon();

        d.init(null);
        d.start();
    }

    private Map<String, String> loadFrameworkProperties(String filename) {
        Map<String, String> properties = new HashMap<String, String>();

        File f = new File(filename);

        if (!f.exists() || !f.isFile() || !f.canRead()) {
            return properties;
        }

        Properties workingCopy = new Properties();

        FileInputStream stream = null;

        try {
            stream = new FileInputStream(f);

            workingCopy.load(stream);
        } catch (IOException e) {
            e.printStackTrace(System.err);
        } finally {
            if (stream != null) {
                try {
                    stream.close();
                } catch (IOException e) {
                    /* Ignore */
                }
            }
        }

        for (String key : workingCopy.stringPropertyNames()) {
            properties.put(key, workingCopy.getProperty(key));
        }

        PropertiesParser.performSubstitutions(properties);

        return properties;
    }
}