curator-global-config's Introduction

Globally Centralized Configuration (Java)

Central configuration repository client using Zookeeper. Build on top of Zookeeper using Curator Framework https://github.com/Netflix/curator

General Overview

Java Application connects to set of Zookeeper servers using Curator Framework
Fetches recent configuration settings (property file) and maintains local copy in HashMap for quick lookups
Client watches znode for changes and updates local HashMap when configuration changes
Optionally client may add listeners on each configuration key to handle onChange events

Example

// Zookeeper CuratorFramework Connections
CuratorFramework zooClient = CuratorFrameworkFactory.builder().namespace("curatordemo")
			.connectString("localhost:2181").retryPolicy(new ExponentialBackoffRetry(1000, 3))
			.connectionTimeoutMs(30000).build();
zooClient.start();

// Configuration Manager Initialization
ConfManager confManager = ConfManager.getInstance();
confManager.setDataFormat(CONF_DATA_FORMAT.JSON); // assumes data to be in JSON
confManager.setZookeeperPath("/sample-path"); // optional to set correct global path
confManager.setClient(zooClient);

// Read Properties (String, Integers, Arrays)
String stringProp = confManager.getPropertyAsString("test.stringKey", "defValue");
Integer intProp = confManager.getPropertyAsInteger("test.intKey", 10);
ArrayList<String> arrayProp = confManager.getPropertyAsList("test.arrayKey", Arrays.asList(""));

confManager.addChangeListener("test.changeKeyTest", new ConfManager.PropertyChangeHandler<String>() {
    @Override
    public void handle(String newValue) {
        System.out.println("Received new value: " + newValue);
    }
});

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