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From Avin <avi...@yahoo.com.INVALID>
Subject Composite Configuration with ReloadingFileBasedConfiguration
Date Wed, 20 Apr 2016 03:10:59 GMT
I am trying to implement the Apache Configuration 2 in my codebaseimport java.io.File;
import java.util.concurrent.TimeUnit;

import org.apache.commons.configuration2.PropertiesConfiguration;
import org.apache.commons.configuration2.builder.ConfigurationBuilderEvent;
import org.apache.commons.configuration2.builder.ReloadingFileBasedConfigurationBuilder;
import org.apache.commons.configuration2.builder.fluent.Parameters;
import org.apache.commons.configuration2.convert.DefaultListDelimiterHandler;
import org.apache.commons.configuration2.event.EventListener;
import org.apache.commons.configuration2.ex.ConfigurationException;
import org.apache.commons.configuration2.reloading.PeriodicReloadingTrigger;

import org.apache.commons.configuration2.CompositeConfiguration;

public class Test {

    private static final long DELAY_MILLIS = 10 * 60 * 5;


    public static void main(String[] args) {
        // TODO Auto-generated method stub
        CompositeConfiguration compositeConfiguration = new CompositeConfiguration();
        PropertiesConfiguration props = null;
        try {
            props = initPropertiesConfiguration(new File("/tmp/DEV.properties"));
        } catch (ConfigurationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        compositeConfiguration.addConfiguration( props );
        compositeConfiguration.addEventListener(ConfigurationBuilderEvent.ANY,
                new EventListener<ConfigurationBuilderEvent>()
                {
                    @Override
                    public void onEvent(ConfigurationBuilderEvent event)
                    {
                        System.out.println("Event:" + event);

                    }
                });

        System.out.println(compositeConfiguration.getString("property1"));

        try {
            Thread.sleep(14*1000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        // Have a script which changes the value of property1 in DEV.properties
        System.out.println(compositeConfiguration.getString("property1"));
    }

    protected static PropertiesConfiguration initPropertiesConfiguration(File propsFile) throws
ConfigurationException { 

        if(propsFile.exists()) {

            final ReloadingFileBasedConfigurationBuilder<PropertiesConfiguration> builder
=
                    new ReloadingFileBasedConfigurationBuilder<PropertiesConfiguration>(PropertiesConfiguration.class)
                    .configure(new Parameters().fileBased()
                        .setFile(propsFile)
                        .setReloadingRefreshDelay(DELAY_MILLIS)
                        .setThrowExceptionOnMissing(false)
                        .setListDelimiterHandler(new DefaultListDelimiterHandler(';')));
            final PropertiesConfiguration propsConfiguration = builder.getConfiguration();
            PeriodicReloadingTrigger trigger = new PeriodicReloadingTrigger(builder.getReloadingController(),
                    null, 1, TimeUnit.SECONDS);
                trigger.start();

            return propsConfiguration;
        } else {
            return new PropertiesConfiguration();
        }

    }
}
Here is a sample code that I using to check whether the Automatic Reloading works or not.
However when the underlying property file is updated, the configuration doesn't reflect it.Once
the DEV.properties is updated, it doesn't get reflected when the compositeConfiguration.getString("property1") is
called again. 

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