be.vlaanderen.sesam.monitor.internal.ConfigurationServiceImpl.java Source code

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Here is the source code for be.vlaanderen.sesam.monitor.internal.ConfigurationServiceImpl.java

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/*
 * Copyright 2011 Vlaams Gewest
 *
 * This file is part of SESAM, the Service Endpoint Security And Monitoring framework.
 *
 * SESAM 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 3 of the License, or
 * (at your option) any later version.
 *
 * SESAM 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 SESAM.  If not, see <http://www.gnu.org/licenses/>.
 */

package be.vlaanderen.sesam.monitor.internal;

import java.io.File;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;

import org.osgi.framework.BundleContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.osgi.context.support.OsgiBundleXmlApplicationContext;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import be.vlaanderen.sesam.monitor.ClientConnectionService;
import be.vlaanderen.sesam.monitor.ConfigurationService;
import be.vlaanderen.sesam.monitor.MonitorService;
import be.vlaanderen.sesam.monitor.MonitorTask;

@Component
public class ConfigurationServiceImpl implements ConfigurationService, InitializingBean {

    private static final Logger log = LoggerFactory.getLogger(ConfigurationServiceImpl.class);

    private static final long SCANTIMEMILLIS = 60000;

    @Autowired
    @Qualifier("configurationFile")
    private String configurationFile;

    @Autowired
    private BundleContext bundleContext;

    @Autowired
    private ClientConnectionService clientService;

    @Autowired
    @Qualifier("configurationTaskFileRootFolder")
    private String taskRootFolder;

    @Autowired
    private MonitorService monitorService;

    private long lastModified;

    public void afterPropertiesSet() throws Exception {
        checkConfigurationChange();
    }

    @SuppressWarnings("unchecked")
    @Scheduled(fixedDelay = SCANTIMEMILLIS)
    public void checkConfigurationChange() {
        log.debug("Checking for configuration changes.");
        try {
            File f = new File(configurationFile);
            if (f.isFile()) {
                long l = f.lastModified();
                if (l != lastModified) {
                    loadConfiguration();
                }
            } else {
                log.warn("Configuration file not found!");
                monitorService.monitor(Collections.EMPTY_LIST);
            }
        } catch (Exception e) {
            log.warn("Failed checking for configuration changes: " + e.getMessage());
        }
    }

    // ---------------------------------------------------------

    private void loadConfiguration() {
        lastModified = (new File(configurationFile)).lastModified();
        OsgiBundleXmlApplicationContext ctx = new OsgiBundleXmlApplicationContext(
                new String[] { "file:" + configurationFile });
        ctx.setBundleContext(bundleContext);
        ctx.refresh();
        Map<String, MonitorTask> tasks = ctx.getBeansOfType(MonitorTask.class);
        List<MonitorTask> badUns = new ArrayList<MonitorTask>();

        // FIXME
        // need to manually wire beans, OSGi issue, manually parsing isn't giving the same result as automatically at
        // startup...
        for (MonitorTask mt : tasks.values()) {
            mt.setClientService(clientService);
            mt.setTaskRootFolder(taskRootFolder);
            try {
                mt.afterPropertiesSet();
                if (!mt.isActive() || !mt.isValid())
                    badUns.add(mt);
            } catch (Exception e) {
                log.warn("Failed initializing task: " + mt.getName() + " -- " + e.getMessage());
                badUns.add(mt);
            }
        }

        tasks.values().removeAll(badUns);

        monitorService.monitor(tasks.values());
    }
}