Java Code Examples for org.mapdb.DB#getTreeMap()

public static void main(String[] args){
DB db = DBMaker.newFileDB(new File("/tmp/db2"))
        .journalDisable()
                //.asyncWriteDisable()
        .make();

Map<Integer, String> map = db.getTreeMap("map");

long time = System.currentTimeMillis();
long max = (int) 1e8;
long step = max/100;
for(int i=0;i<max;i++){
    map.get(i);
    if(i%step == 0){
        System.out.println(100.0 * i/max);
    }

}

System.out.println("Closing");
db.close();

System.out.println(System.currentTimeMillis() - time);
}
 

public static void main(String[] args) {
    DB db = DBMaker.newTempFileDB().make();

    //open or create new map
    Map<Long, String> map = db.getTreeMap("map");

    // open existing or create new Atomic record with given name
    // if no record with given name exist, new recid is created with value `0`
    Atomic.Long keyinc = Atomic.getLong(db, "map_keyinc");


    // Allocate new unique key to use in map
    // Atomic.Long will use `compare-and-swap` operation to atomically store incremented value
    // Key values can be used only for single insert
    // key == 1
    Long key = keyinc.incrementAndGet();
    map.put(key, "some string");

    // insert second entry,
    // key==2
    map.put(keyinc.incrementAndGet(), "some other string");

    System.out.println(map);

}
 

public static void main(String[] args){

        //Configure and open database using builder pattern.
        //All options are available with code auto-completion.
        File dbFile = Utils.tempDbFile();
        DB db = DBMaker.newFileDB(dbFile)
                .closeOnJvmShutdown()
                .encryptionEnable("password")
                .make();

        //open an collection, TreeMap has better performance then HashMap
        ConcurrentNavigableMap<Integer,String> map = db.getTreeMap("collectionName");

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

        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();

    }
 

public static void main(String[] args){
    DB db = DBMaker
            //.newFileDB(new File("/mnt/big/db/aa"))
            .newAppendFileDB(new File("/mnt/big/db/aa" + System.currentTimeMillis()))
            .make();

    Map map = db
            .getTreeMap("map");
            //.getHashMap("map");

    long time = System.currentTimeMillis();
    long max = (int) 1e8;
    AtomicLong progress = new AtomicLong(0);
    Utils.printProgress(progress);

    while(progress.incrementAndGet()<max){
        Long val = Utils.RANDOM.nextLong();
        map.put(val, "test"+val);
    }
    progress.set(-1);

    System.out.println("Closing");
    db.close();

    System.out.println(System.currentTimeMillis() - time);

}
 

public static void main(String[] args) {
	
	// Open or create db file
	DB db = DBMaker.newFileDB(new File("dbCustomValue"))
			.make();
	
	// Open or create table
	Map<String,Person> dbMap = db.getTreeMap("personAndCity");
	
	// Add data
	Person bilbo = new Person("Bilbo","The Shire");
	Person sauron = new Person("Sauron","Mordor");
	Person radagast = new Person("Radagast","Crazy Farm");
	
	dbMap.put("west",bilbo);
	dbMap.put("south",sauron);
	dbMap.put("mid",radagast);

	// Commit and close
	db.commit();
	db.close();


       //
       // Second option for using cystom values is to use your own serializer.
       // This usually leads to better performance as MapDB does not have to
       // analyze the class structure.
       //

       class CustomSerializer implements Serializer<Person>, Serializable{

           @Override
           public void serialize(DataOutput out, Person value) throws IOException {
               out.writeUTF(value.getName());
               out.writeUTF(value.getCity());
           }

           @Override
           public Person deserialize(DataInput in, int available) throws IOException {
               return new Person(in.readUTF(), in.readUTF());
           }
       }

       Serializer<Person> serializer = new CustomSerializer();

       DB db2 = DBMaker.newTempFileDB().make();

       Map<String,Person> map2 = db2.createHashMap("map",null, serializer); //key serializer is null (use default)

       map2.put("North", new Person("Yet another dwarf","Somewhere"));

       db2.close();


}
 

@Override
protected Map<String, byte[]> getMap(DB database) 
{
	//OPEN MAP
	return database.getTreeMap("references");
}
 

public AccountMap(WalletDatabase walletDatabase, DB database) 
{
	//OPEN MAP
	this.addressMap = database.getTreeMap(ADDRESSES);
}