fix java sample typo and replace deprecated code with latest (#7906)

Summary:
1. replace deprecated code in sample java with latest api
2. fix optimistictransaction sample code typo

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7906

Reviewed By: ajkr

Differential Revision: D26127429

Pulled By: jay-zhuang

fbshipit-source-id: f015ad1435f565cffb8798a4fb5afc44c72d73d7

java/samples/src/main/java/OptimisticTransactionSample.java

@@ -111,7 +111,7 @@ public class OptimisticTransactionSample {
       // Read a key using the snapshot.
       readOptions.setSnapshot(snapshot);
       final byte[] value = txn.getForUpdate(readOptions, key1, true);
-      assert(value == value1);
+      assert (value == null);
 
       try {
         // Attempt to commit transaction

java/samples/src/main/java/RocksDBColumnFamilySample.java

@@ -53,8 +53,8 @@ public class RocksDBColumnFamilySample {
 
       try {
         // put and get from non-default column family
-        db.put(columnFamilyHandles.get(0), new WriteOptions(),
-            "key".getBytes(), "value".getBytes());
+        db.put(
+            columnFamilyHandles.get(1), new WriteOptions(), "key".getBytes(), "value".getBytes());
 
         // atomic write
         try (final WriteBatch wb = new WriteBatch()) {
@@ -62,7 +62,7 @@ public class RocksDBColumnFamilySample {
               "value2".getBytes());
           wb.put(columnFamilyHandles.get(1), "key3".getBytes(),
               "value3".getBytes());
-          wb.remove(columnFamilyHandles.get(0), "key".getBytes());
+          wb.delete(columnFamilyHandles.get(1), "key".getBytes());
           db.write(new WriteOptions(), wb);
         }
 

java/samples/src/main/java/RocksDBSample.java

@@ -45,7 +45,7 @@ public class RocksDBSample {
             .setStatistics(stats)
             .setWriteBufferSize(8 * SizeUnit.KB)
             .setMaxWriteBufferNumber(3)
-            .setMaxBackgroundCompactions(10)
+            .setMaxBackgroundJobs(10)
             .setCompressionType(CompressionType.SNAPPY_COMPRESSION)
             .setCompactionStyle(CompactionStyle.UNIVERSAL);
       } catch (final IllegalArgumentException e) {
@@ -55,7 +55,7 @@ public class RocksDBSample {
       assert (options.createIfMissing() == true);
       assert (options.writeBufferSize() == 8 * SizeUnit.KB);
       assert (options.maxWriteBufferNumber() == 3);
-      assert (options.maxBackgroundCompactions() == 10);
+      assert (options.maxBackgroundJobs() == 10);
       assert (options.compressionType() == CompressionType.SNAPPY_COMPRESSION);
       assert (options.compactionStyle() == CompactionStyle.UNIVERSAL);
 
@@ -87,24 +87,17 @@ public class RocksDBSample {
       options.setRateLimiter(rateLimiter);
 
       final BlockBasedTableConfig table_options = new BlockBasedTableConfig();
-      table_options.setBlockCacheSize(64 * SizeUnit.KB)
-          .setFilter(bloomFilter)
-          .setCacheNumShardBits(6)
+      Cache cache = new LRUCache(64 * 1024, 6);
+      table_options.setBlockCache(cache)
+          .setFilterPolicy(bloomFilter)
           .setBlockSizeDeviation(5)
           .setBlockRestartInterval(10)
           .setCacheIndexAndFilterBlocks(true)
-          .setHashIndexAllowCollision(false)
-          .setBlockCacheCompressedSize(64 * SizeUnit.KB)
-          .setBlockCacheCompressedNumShardBits(10);
+          .setBlockCacheCompressed(new LRUCache(64 * 1000, 10));
 
-      assert (table_options.blockCacheSize() == 64 * SizeUnit.KB);
-      assert (table_options.cacheNumShardBits() == 6);
       assert (table_options.blockSizeDeviation() == 5);
       assert (table_options.blockRestartInterval() == 10);
       assert (table_options.cacheIndexAndFilterBlocks() == true);
-      assert (table_options.hashIndexAllowCollision() == false);
-      assert (table_options.blockCacheCompressedSize() == 64 * SizeUnit.KB);
-      assert (table_options.blockCacheCompressedNumShardBits() == 10);
 
       options.setTableFormatConfig(table_options);
       assert (options.tableFactoryName().equals("BlockBasedTable"));
@@ -203,7 +196,7 @@ public class RocksDBSample {
         len = db.get(readOptions, testKey, enoughArray);
         assert (len == testValue.length);
 
-        db.remove(testKey);
+        db.delete(testKey);
         len = db.get(testKey, enoughArray);
         assert (len == RocksDB.NOT_FOUND);
 
@@ -284,15 +277,15 @@ public class RocksDBSample {
           }
         }
 
-        Map<byte[], byte[]> values = db.multiGet(keys);
+        List<byte[]> values = db.multiGetAsList(keys);
         assert (values.size() == keys.size());
-        for (final byte[] value1 : values.values()) {
+        for (final byte[] value1 : values) {
           assert (value1 != null);
         }
 
-        values = db.multiGet(new ReadOptions(), keys);
+        values = db.multiGetAsList(new ReadOptions(), keys);
         assert (values.size() == keys.size());
-        for (final byte[] value1 : values.values()) {
+        for (final byte[] value1 : values) {
           assert (value1 != null);
         }
       } catch (final RocksDBException e) {