+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.arrow.dataset.jni;
+
+/**
+ * C++ memory pool(arrow::MemoryPool)'s Java mapped instance.
+ */
+public class NativeMemoryPool implements AutoCloseable {
+ private final long nativeInstanceId;
+
+ static {
+ JniLoader.get().ensureLoaded();
+ }
+
+ private NativeMemoryPool(long nativeInstanceId) {
+ this.nativeInstanceId = nativeInstanceId;
+ }
+
+ /**
+ * Get the default memory pool. This will return arrow::default_memory_pool() directly.
+ */
+ public static NativeMemoryPool getDefault() {
+ return new NativeMemoryPool(getDefaultMemoryPool());
+ }
+
+ /**
+ * Create a listenable memory pool (see also: arrow::ReservationListenableMemoryPool) with
+ * a specific listener. All buffers created from the memory pool should take enough reservation
+ * from the listener in advance.
+ */
+ public static NativeMemoryPool createListenable(ReservationListener listener) {
+ return new NativeMemoryPool(createListenableMemoryPool(listener));
+ }
+
+ /**
+ * Return native instance ID of this memory pool.
+ */
+ public long getNativeInstanceId() {
+ return nativeInstanceId;
+ }
+
+ /**
+ * Get current allocated bytes.
+ */
+ public long getBytesAllocated() {
+ return bytesAllocated(nativeInstanceId);
+ }
+
+ @Override
+ public void close() throws Exception {
+ releaseMemoryPool(nativeInstanceId);
+ }
+
+ private static native long getDefaultMemoryPool();
+
+ private static native long createListenableMemoryPool(ReservationListener listener);
+
+ private static native void releaseMemoryPool(long id);
+
+ private static native long bytesAllocated(long id);
+}