/*
 * 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.fluss.memory;

import org.apache.fluss.testutils.junit.parameterized.ParameterizedTestExtension;

import org.junit.jupiter.api.TestTemplate;
import org.junit.jupiter.api.extension.ExtendWith;

import java.nio.ByteBuffer;

import static org.apache.fluss.memory.MemoryUtils.getByteBufferAddress;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatThrownBy;

/** Tests for the {@link MemorySegment} in off-heap mode using direct memory. */
@ExtendWith(ParameterizedTestExtension.class)
public class OffHeapDirectMemorySegmentTest extends MemorySegmentTestBase {

    public OffHeapDirectMemorySegmentTest(int pageSize) {
        super(pageSize);
    }

    @Override
    MemorySegment createSegment(int size) {
        return MemorySegment.allocateOffHeapMemory(size);
    }

    @TestTemplate
    public void testHeapSegmentSpecifics() {
        final int bufSize = 411;
        MemorySegment seg = createSegment(bufSize);

        assertThat(seg.isOffHeap()).isTrue();
        assertThat(seg.size()).isEqualTo(bufSize);

        //noinspection ResultOfMethodCallIgnored.
        assertThatThrownBy(seg::getArray).isInstanceOf(IllegalStateException.class);

        ByteBuffer buf1 = seg.wrap(1, 2);
        ByteBuffer buf2 = seg.wrap(3, 4);

        assertThat(buf2).isNotSameAs(buf1);
        assertThat(buf1.position()).isEqualTo(1);
        assertThat(buf1.limit()).isEqualTo(3);
        assertThat(buf2.position()).isEqualTo(3);
        assertThat(buf2.limit()).isEqualTo(7);
    }

    @TestTemplate
    public void testGetAddress() {
        assertThat(segment.getAddress())
                .isEqualTo(getByteBufferAddress(segment.getOffHeapBuffer()));
    }
}
