clients/src/test/java/org/apache/kafka/common/record/BufferSupplierTest.java

/*
 * 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.kafka.common.record;

import org.junit.Test;

import java.nio.ByteBuffer;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertSame;

public class BufferSupplierTest {

    @Test
    public void testGrowableBuffer() {
        BufferSupplier.GrowableBufferSupplier supplier = new BufferSupplier.GrowableBufferSupplier();
        ByteBuffer buffer = supplier.get(1024);
        assertEquals(0, buffer.position());
        assertEquals(1024, buffer.capacity());
        supplier.release(buffer);

        ByteBuffer cached = supplier.get(512);
        assertEquals(0, cached.position());
        assertSame(buffer, cached);

        ByteBuffer increased = supplier.get(2048);
        assertEquals(2048, increased.capacity());
        assertEquals(0, increased.position());
    }

}