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rocksdb/java/RocksDBSample.java

132 lines
4.1 KiB

// Copyright (c) 2014, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
import java.util.*;
import java.lang.*;
import org.rocksdb.*;
import java.io.IOException;
public class RocksDBSample {
static {
System.loadLibrary("rocksdbjni");
}
public static void main(String[] args) {
if (args.length < 1) {
System.out.println("usage: RocksDBSample db_path");
return;
}
String db_path = args[0];
String db_path_not_found = db_path + "_not_found";
System.out.println("RocksDBSample");
RocksDB db = null;
Options options = new Options();
try {
db = RocksDB.open(options, db_path_not_found);
assert(false);
} catch (RocksDBException e) {
System.out.format("caught the expceted exception -- %s\n", e);
assert(db == null);
}
options.setCreateIfMissing(true)
.setWriteBufferSize(8 * 1024)
.setMaxWriteBufferNumber(3)
.setDisableSeekCompaction(true)
.setBlockSize(64 * 1024)
.setMaxBackgroundCompactions(10);
assert(options.createIfMissing() == true);
assert(options.writeBufferSize() == 8192);
assert(options.maxWriteBufferNumber() == 3);
assert(options.disableSeekCompaction() == true);
assert(options.blockSize() == 65536);
assert(options.maxBackgroundCompactions() == 10);
try {
db = RocksDB.open(options, db_path_not_found);
db.put("hello".getBytes(), "world".getBytes());
byte[] value = db.get("hello".getBytes());
assert("world".equals(new String(value)));
} catch (RocksDBException e) {
System.out.format("[ERROR] caught the unexpceted exception -- %s\n", e);
assert(db == null);
assert(false);
}
// be sure to release the c++ pointer
options.dispose();
db.close();
try {
db = RocksDB.open(db_path);
db.put("hello".getBytes(), "world".getBytes());
byte[] value = db.get("hello".getBytes());
System.out.format("Get('hello') = %s\n",
new String(value));
for (int i = 1; i <= 9; ++i) {
for (int j = 1; j <= 9; ++j) {
db.put(String.format("%dx%d", i, j).getBytes(),
String.format("%d", i * j).getBytes());
}
}
for (int i = 1; i <= 9; ++i) {
for (int j = 1; j <= 9; ++j) {
System.out.format("%s ", new String(db.get(
String.format("%dx%d", i, j).getBytes())));
}
System.out.println("");
}
value = db.get("1x1".getBytes());
assert(value != null);
value = db.get("world".getBytes());
assert(value == null);
byte[] testKey = "asdf".getBytes();
byte[] testValue =
"asdfghjkl;'?><MNBVCXZQWERTYUIOP{+_)(*&^%$#@".getBytes();
db.put(testKey, testValue);
byte[] testResult = db.get(testKey);
assert(testResult != null);
assert(Arrays.equals(testValue, testResult));
assert(new String(testValue).equals(new String(testResult)));
byte[] insufficientArray = new byte[10];
byte[] enoughArray = new byte[50];
int len;
len = db.get(testKey, insufficientArray);
assert(len > insufficientArray.length);
len = db.get("asdfjkl;".getBytes(), enoughArray);
assert(len == RocksDB.NOT_FOUND);
len = db.get(testKey, enoughArray);
assert(len == testValue.length);
db.remove(testKey);
len = db.get(testKey, enoughArray);
assert(len == RocksDB.NOT_FOUND);
// repeat the test with WriteOptions
WriteOptions writeOpts = new WriteOptions();
writeOpts.setSync(true);
writeOpts.setDisableWAL(true);
db.put(writeOpts, testKey, testValue);
len = db.get(testKey, enoughArray);
assert(len == testValue.length);
assert(new String(testValue).equals(
new String(enoughArray, 0, len)));
writeOpts.dispose();
} catch (RocksDBException e) {
System.err.println(e);
}
if (db != null) {
db.close();
}
}
}