How to read xml file key value using netflix archaius API? - netflix-archaius

Question

I am new in Netflix Archaius. Can anyone please provide sample code to read key value from xml file ?
Also would like to see values are update automatically when I changed any key in XML file ...
Regards,
Ashish

Answer 1

Sample JUnit on how to use xml for key/value pairs and using Archaius to automatically load the changes :
Important note on the sample code : The program exits after the first callback. If you want to test more callbacks, increase the counter at class variable 'latch'
package com.test.config;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CountDownLatch;
import org.apache.commons.configuration.XMLPropertiesConfiguration;
import org.junit.Test;
import com.netflix.config.AbstractPollingScheduler;
import com.netflix.config.ConcurrentMapConfiguration;
import com.netflix.config.ConfigurationManager;
import com.netflix.config.DynamicConfiguration;
import com.netflix.config.DynamicPropertyFactory;
import com.netflix.config.DynamicStringProperty;
import com.netflix.config.FixedDelayPollingScheduler;
import com.netflix.config.PollResult;
import com.netflix.config.PolledConfigurationSource;
public class TestArchaius {
CountDownLatch latch = new CountDownLatch(1);
#Test
public void tes() throws Exception {
AbstractPollingScheduler scheduler = new FixedDelayPollingScheduler(0, 1000, false);
DynamicConfiguration dynamicConfiguration = new DynamicConfiguration(new MyPolledConfigurationSource(), scheduler);
ConfigurationManager.install(dynamicConfiguration);
DynamicStringProperty fieldsProperty = DynamicPropertyFactory.getInstance().getStringProperty("key1", "");
fieldsProperty.addCallback(() -> {
System.out.println(fieldsProperty.get());
latch.countDown();
});
latch.await();
}
class MyPolledConfigurationSource implements PolledConfigurationSource {
#Override
public PollResult poll(boolean initial, Object checkPoint) throws Exception {
ConcurrentMapConfiguration configFromPropertiesFile = new ConcurrentMapConfiguration(
new XMLPropertiesConfiguration("test.xml"));
Map<String, Object> fullProperties = new HashMap<String, Object>();
configFromPropertiesFile.getProperties().forEach((k, v) -> fullProperties.put((String) k, v));
return PollResult.createFull(fullProperties);
}
}
}
test.xml :
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
<properties>
<comment>Description of the property list</comment>
<entry key="key1">value1</entry>
<entry key="key2">value2</entry>
<entry key="key3">value3</entry>
</properties>