[Java] Add SizeUnit in org.rocksdb.util to store const like KB, GB.

Summary:
* Add a class SizeUnit to store frequently used consts.  Currently
  it has KB, MB, GB, TB, and PB.

* Change the parameter type of Options.writeBufferSize and Options.blockSize
  from int to long.

Test Plan:
make rocksdbjava
make jtest

Reviewers: haobo, ankgup87, sdong, dhruba

Reviewed By: haobo

CC: leveldb

Differential Revision: https://reviews.facebook.net/D17703

java/Makefile

@@ -8,8 +8,8 @@ clean:
 	rm -f $(ROCKSDB_JAR)
 
 java:
-	javac org/rocksdb/*.java
-	jar -cf $(ROCKSDB_JAR) org/rocksdb/*.class
+	javac org/rocksdb/*.java org/rocksdb/util/*.java
+	jar -cf $(ROCKSDB_JAR) org/rocksdb/*.class org/rocksdb/util/*.class
 	javah -d $(NATIVE_INCLUDE) -jni $(NATIVE_JAVA_CLASSES)
 
 sample: java

java/RocksDBSample.java

@@ -6,6 +6,7 @@
 import java.util.*;
 import java.lang.*;
 import org.rocksdb.*;
+import org.rocksdb.util.SizeUnit;
 import java.io.IOException;
 
 public class RocksDBSample {
@@ -33,17 +34,17 @@ public class RocksDBSample {
     }
 
     options.setCreateIfMissing(true)
-        .setWriteBufferSize(8 * 1024)
+        .setWriteBufferSize(8 * SizeUnit.KB)
         .setMaxWriteBufferNumber(3)
         .setDisableSeekCompaction(true)
-        .setBlockSize(64 * 1024)
+        .setBlockSize(64 * SizeUnit.KB)
         .setMaxBackgroundCompactions(10);
 
     assert(options.createIfMissing() == true);
-    assert(options.writeBufferSize() == 8192);
+    assert(options.writeBufferSize() == 8 * SizeUnit.KB);
     assert(options.maxWriteBufferNumber() == 3);
     assert(options.disableSeekCompaction() == true);
-    assert(options.blockSize() == 65536);
+    assert(options.blockSize() == 64 * SizeUnit.KB);
     assert(options.maxBackgroundCompactions() == 10);
 
     try {

java/org/rocksdb/Options.java

@@ -71,7 +71,7 @@ public class Options {
    * @return the instance of the current Options.
    * @see RocksDB.open()
    */
-  public Options setWriteBufferSize(int writeBufferSize) {
+  public Options setWriteBufferSize(long writeBufferSize) {
     assert(isInitialized());
     setWriteBufferSize(nativeHandle_, writeBufferSize);
     return this;
@@ -83,7 +83,7 @@ public class Options {
    * @return size of write buffer.
    * @see setWriteBufferSize()
    */
-  public int writeBufferSize()  {
+  public long writeBufferSize()  {
     assert(isInitialized());
     return writeBufferSize(nativeHandle_);
   }
@@ -127,7 +127,7 @@ public class Options {
    * @return the instance of the current Options.
    * @see RocksDB.open()
    */
-  public Options setBlockSize(int blockSize) {
+  public Options setBlockSize(long blockSize) {
     assert(isInitialized());
     setBlockSize(nativeHandle_, blockSize);
     return this;
@@ -139,7 +139,7 @@ public class Options {
    * @return block size.
    * @see setBlockSize()
    */
-  public int blockSize() {
+  public long blockSize() {
     assert(isInitialized());
     return blockSize(nativeHandle_);
   }
@@ -236,13 +236,13 @@ public class Options {
   private native void dispose0();
   private native void setCreateIfMissing(long handle, boolean flag);
   private native boolean createIfMissing(long handle);
-  private native void setWriteBufferSize(long handle, int writeBufferSize);
-  private native int writeBufferSize(long handle);
+  private native void setWriteBufferSize(long handle, long writeBufferSize);
+  private native long writeBufferSize(long handle);
   private native void setMaxWriteBufferNumber(
       long handle, int maxWriteBufferNumber);
   private native int maxWriteBufferNumber(long handle);
-  private native void setBlockSize(long handle, int blockSize);
-  private native int blockSize(long handle);
+  private native void setBlockSize(long handle, long blockSize);
+  private native long blockSize(long handle);
   private native void setDisableSeekCompaction(
       long handle, boolean disableSeekCompaction);
   private native boolean disableSeekCompaction(long handle);

java/org/rocksdb/util/SizeUnit.java

@@ -0,0 +1,16 @@
+// 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.
+
+package org.rocksdb.util;
+
+public class SizeUnit {
+  public static final long KB = 1024L;
+  public static final long MB = KB * KB;
+  public static final long GB = KB * MB;
+  public static final long TB = KB * GB;
+  public static final long PB = KB * TB;
+
+  private SizeUnit() {}
+}

java/rocksjni/options.cc

@@ -61,10 +61,10 @@ jboolean Java_org_rocksdb_Options_createIfMissing(
 /*
  * Class:     org_rocksdb_Options
  * Method:    setWriteBufferSize
- * Signature: (JZ)I
+ * Signature: (JJ)I
  */
 void Java_org_rocksdb_Options_setWriteBufferSize(
-    JNIEnv* env, jobject jobj, jlong jhandle, jint jwrite_buffer_size) {
+    JNIEnv* env, jobject jobj, jlong jhandle, jlong jwrite_buffer_size) {
   reinterpret_cast<rocksdb::Options*>(jhandle)->write_buffer_size =
           static_cast<size_t>(jwrite_buffer_size);
 }
@@ -73,9 +73,9 @@ void Java_org_rocksdb_Options_setWriteBufferSize(
 /*
  * Class:     org_rocksdb_Options
  * Method:    writeBufferSize
- * Signature: (J)I
+ * Signature: (J)J
  */
-jint Java_org_rocksdb_Options_writeBufferSize(
+jlong Java_org_rocksdb_Options_writeBufferSize(
     JNIEnv* env, jobject jobj, jlong jhandle) {
   return reinterpret_cast<rocksdb::Options*>(jhandle)->write_buffer_size;
 }
@@ -105,10 +105,10 @@ jint Java_org_rocksdb_Options_maxWriteBufferNumber(
 /*
  * Class:     org_rocksdb_Options
  * Method:    setBlockSize
- * Signature: (JI)V
+ * Signature: (JJ)V
  */
 void Java_org_rocksdb_Options_setBlockSize(
-    JNIEnv* env, jobject jobj, jlong jhandle, jint jblock_size) {
+    JNIEnv* env, jobject jobj, jlong jhandle, jlong jblock_size) {
   reinterpret_cast<rocksdb::Options*>(jhandle)->block_size =
           static_cast<size_t>(jblock_size);
 }
@@ -116,9 +116,9 @@ void Java_org_rocksdb_Options_setBlockSize(
 /*
  * Class:     org_rocksdb_Options
  * Method:    blockSize
- * Signature: (J)I
+ * Signature: (J)J
  */
-jint Java_org_rocksdb_Options_blockSize(
+jlong Java_org_rocksdb_Options_blockSize(
     JNIEnv* env, jobject jobj, jlong jhandle) {
   return reinterpret_cast<rocksdb::Options*>(jhandle)->block_size;
 }