com.netflix.config.samples.SampleApplication Maven / Gradle / Ivy
/**
* Copyright 2014 Netflix, Inc.
*
* 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.netflix.config.samples;
import org.apache.commons.configuration.AbstractConfiguration;
import com.netflix.config.ConcurrentMapConfiguration;
import com.netflix.config.DynamicIntProperty;
import com.netflix.config.DynamicPropertyFactory;
import com.netflix.config.DynamicStringProperty;
import com.netflix.config.jmx.ConfigJMXManager;
import com.netflix.config.jmx.ConfigMBean;
/**
* A Sample Application built to showcase the usage of Configuration and DynamicProperties
*
* To run this sample application, add the following jars to your classpath:
*
* - archaius-core-xxx.jar (latest release/snapshot of archaius-core)
*
- commons-configuration-1.8.jar
*
- commons-lang-2.6.jar
*
- commons-logging-1.1.1.jar
*
*
* @author stonse
*
*/
public class SampleApplication extends Thread {
static ConfigMBean configMBean = null;
public SampleApplication() {
// This application is set up as a non-daemon app
// as we want it to just hang around allowing us to launch jconsole
// to perform properties based operations
setDaemon(false);
start();
}
public void run() {
while (true) {
try {
sleep(100);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
}
/**
* SampleApplication entrypoint
* @param args
*/
public static void main(String[] args) {
//@SuppressWarnings(value = {"unused" })
new SampleApplication();
// Step 1.
// Create a Source of Configuration
// Here we use a simple ConcurrentMapConfiguration
// You can use your own, or use of the pre built ones including JDBCConfigurationSource
// which lets you load properties from any RDBMS
AbstractConfiguration myConfiguration = new ConcurrentMapConfiguration();
myConfiguration.setProperty("com.netflix.config.samples.sampleapp.prop1", "value1");
myConfiguration.setProperty(
"com.netflix.config.samples.SampleApp.SampleBean.name",
"A Coffee Bean from Gautemala");
// STEP 2: Optional. Dynamic Runtime property change option
// We would like to utilize the benefits of obtaining dynamic property
// changes
// initialize the DynamicPropertyFactory with our configuration source
DynamicPropertyFactory.initWithConfigurationSource(myConfiguration);
// STEP 3: Optional. Option to inspect and modify properties using JConsole
// We would like to inspect properties via JMX JConsole and potentially
// update
// these properties too
// Register the MBean
//
// This can be also achieved automatically by setting "true" to
// system property "archaius.dynamicPropertyFactory.registerConfigWithJMX"
configMBean = ConfigJMXManager.registerConfigMbean(myConfiguration);
// once this application is launched, launch JConsole and navigate to
// the
// Config MBean (under the MBeans tab)
System.out
.println("Started SampleApplication. Launch JConsole to inspect and update properties");
System.out.println("To see how callback work, update property com.netflix.config.samples.SampleApp.SampleBean.sensitiveBeanData from BaseConfigBean in JConsole");
SampleBean sampleBean = new SampleBean();
System.out.println("SampleBean:" + sampleBean);
System.out.println(sampleBean.getName());
}
}
/**
* Simple Class that has its field values influenced (assigned with values) from
* Properties Some fields can get initialized at startup only and NOT change
* when actual property value is changed. Others can use
* DynamicProperty and contain values that are in sync with the
* runtime changes to the property source.
*
* @author stonse
*
*/
class SampleBean {
/**
* Default CTOR
*/
public SampleBean() {
// value of field obtained during init only
this.name = DynamicPropertyFactory
.getInstance()
.getStringProperty(
"com.netflix.config.samples.SampleApp.SampleBean.name",
"Sample Bean").get();
}
/**
* Name of this bean :-) The value for this can be obtained from Properties
*/
public String name;
/**
* Number of seeds in this bean. The value for this is automatically
* populated by the Configuration. Additionally, if the property value is
* modified, the new value will be reflected as well We can assign a default
* value as well in case a value was not configured or the configuration was
* not successfully loaded
*
*/
public DynamicIntProperty numSeeds = DynamicPropertyFactory.getInstance()
.getIntProperty(
"com.netflix.config.samples.SampleApp.SampleBean.numSeeds",
2);
/**
* This field utilizes the feature of Callbacks.
* When a property value is changed at runtime, it will receive a callback
* which can be used to trigger other operations or used for bookkeeping
*/
DynamicStringProperty sensitiveBeanData = DynamicPropertyFactory
.getInstance()
.getStringProperty(
"com.netflix.config.samples.SampleApp.SampleBean.sensitiveBeanData",
"magic", new Runnable() {
public void run() {
// let my auditing system know about this change
System.out
.println("SampleBean.sensitiveData changed to:"
+ sensitiveBeanData.get());
}
});
/**
* returns the name of this bean
* @return
*/
public String getName(){
return name;
}
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("SampleBean ->name:");
sb.append(name);
sb.append("\t numSeeds:");
sb.append(numSeeds);
sb.append("\tsensitiveBeanData:");
sb.append(sensitiveBeanData);
return sb.toString();
};
}