Add statistics

java/rocksjni/statistics.cc

@@ -0,0 +1,31 @@
+// 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.
+//
+// This file implements the "bridge" between Java and C++ and enables
+// calling c++ rocksdb::Statistics methods from Java side.
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <jni.h>
+#include <string>
+#include <memory>
+
+#include "include/org_rocksdb_Statistics.h"
+#include "rocksjni/portal.h"
+#include "rocksdb/statistics.h"
+#include "rocksdb/options.h"
+
+/*
+ * Class:     org_rocksdb_Statistics
+ * Method:    getTickerCount0
+ * Signature: (IJ)J
+ */
+jlong Java_org_rocksdb_Statistics_getTickerCount0(
+    JNIEnv* env, jobject jobj, int ticker, jlong handle) {
+  auto st = reinterpret_cast<rocksdb::Statistics*>(handle);
+  assert(st != nullptr);
+  
+  return st->getTickerCount(static_cast<rocksdb::Tickers>(ticker));
+}