Java Map的持久化存儲：MapDB

MapDB 提供了并發的 TreeMap 和 HashMap ，使用基于磁盤的存儲。快速、可伸縮性以及易用。

示例代碼：

import org.mapdb.*;

// configure and open database using builder pattern.
// all options are available with code auto-completion.
DB db = DBMaker.newFileDB(new File("testdb"))
               .closeOnJvmShutdown()
               .encryptionEnable("password")
               .make();

// open existing an collection (or create new)
ConcurrentNavigableMap<Integer,String> map = db.getTreeMap("collectionName");

map.put(1, "one");
map.put(2, "two");
// map.keySet() is now [1,2]

db.commit();  //persist changes into disk

map.put(3, "three");
// map.keySet() is now [1,2,3]
db.rollback(); //revert recent changes
// map.keySet() is now [1,2]

db.close();

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