HazelcastAPI Hazelcast Sınıfı - Hazelcast Member'ı Başlatır

Giriş

Şu satırı dahil ederiz

import com.hazelcast.core.Hazelcast;

bootstrappedInstance metodu

Bence bu metodun tek amacı Jet Job içinde kullanmak. 

Örnek

Şöyle yaparız. Böylece Job client içinden de yüklense, member içinden de yüklense çalışabilir.

Pipeline pipeline = ...
HazelcastInstance hz = Hazelcast.bootstrappedInstance();

hz.getJet().newJob(pipeline);

getAllHazelcastInstances metodu

Şöyle yaparız

Set<HazelcastInstance> instances = Hazelcast.getAllHazelcastInstances();
HazelcastInstance hz = instances.stream().findFirst().get();
Map map = hz.getMap("mapName"); // shared distributed map

getOrCreateHazelcastInstance metodu

İmzası şöyle

public static HazelcastInstance getOrCreateHazelcastInstance();

Şöyle yaparız

import com.hazelcast.config.Config;
import com.hazelcast.core.Hazelcast;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.core.IAtomicReference;
import com.hazelcast.core.IFunction;

Config config = new Config();
config.setInstanceName("HAZELCAST_INSTANCE");
HazelcastInstance hazelcastInstance = Hazelcast.getOrCreateHazelcastInstance(config);

IAtomicReference<String> atomicReference = hazelcastInstance.getAtomicReference("TEST");
String item = "A";
System.out.println("Item: " + atomicReference.alterAndGet(new MyFunction(item)));

getHazelcastInstanceByName metodu

Eğer ismi belirtilen instance'ı bulamazsa null döner.

Örnek

Şöyle yaparız

// You can also create a named Hazelcast member. 
// In this case, you should set instanceName of Config object as shown below
Config config = new Config();
config.setInstanceName( "my-instance" );
Hazelcast.newHazelcastInstance( config );

// To retrieve an existing Hazelcast member by its name, use the following
Hazelcast.getHazelcastInstanceByName( "my-instance" );

newHazelcastInstance metodu

Yeni member başlatır. Açıklaması şöyle. Yani gömülü bile olsa hazelcast.xml dosyasını belirtmek mümkün.

Hazelcast will look into two places for the configuration file:

1. System property: Hazelcast will first check if "hazelcast.config" system property is set to a file path. Example: 

  -Dhazelcast.config=C:/myhazelcast.xml.

2. Classpath: If config file is not set as a system property, Hazelcast will check classpath for hazelcast.xml file.

3. If Hazelcast doesn't find any config file, it will start with the default configuration (hazelcast-default.xml) located in hazelcast.jar.

Metodun için şöyle. Yani Config.load() çağrısı yapıyor. Bu yüzden hazelcast.xml içindeki değerler ortam değişkenleri tarafından ezilebilir. Configuration Builder ve Configuration Loader farklı şeyler

public static HazelcastInstance newHazelcastInstance() {
  return HazelcastInstanceFactory.newHazelcastInstance(null);
}

public static HazelcastInstance newHazelcastInstance(Config config) {
  if (config == null) {
    config = Config.load();
  }

  return newHazelcastInstance(
                config,
                config.getInstanceName(),
                new DefaultNodeContext()
  );
}

Örnek

Şöyle yaparız

HazelcastInstance hz = Hazelcast.newHazelcastInstance();

shutdownAll metodu

İmzası şöyle

public static void shutdownAll();

Aynı JVM içinde başlatılan tüm HazelcastInstance nesnelerini kapatır