A SimpleDataStore详解编程语言

public interface DataStore { 

 /** 

 * return a snapshot value of componentName 

 Map String,Object get(String componentName); 

 Object get(String componentName, String key); 

 void put(String componentName, String key, Object value); 

 void remove(String componentName, String key); 

}

public class SimpleDataStore implements DataStore { 

 // 组件类名或标识, 数据名, 数据值 

 private ConcurrentMap String, ConcurrentMap String, Object data = 

 new ConcurrentHashMap String, ConcurrentMap String,Object (); 

 public Map String, Object get(String componentName) { 

 ConcurrentMap String, Object value = data.get(componentName); 

 if(value == null) return new HashMap String, Object (); 

 return new HashMap String, Object (value); 

 public Object get(String componentName, String key) { 

 if (!data.containsKey(componentName)) { 

 return null; 

 return data.get(componentName).get(key); 

 public void put(String componentName, String key, Object value) { 

 Map String, Object componentData = data.get(componentName); 

 if(null == componentData) { 

 data.putIfAbsent(componentName, new ConcurrentHashMap String, Object ()); 

 componentData = data.get(componentName); 

 componentData.put(key, value); 

 public void remove(String componentName, String key) { 

 if (!data.containsKey(componentName)) { 

 return; 

 data.get(componentName).remove(key); 

}

原创文章，作者：ItWorker，如若转载，请注明出处：https://blog.ytso.com/15906.html