src/test/java/com/android/volley/toolbox/ByteArrayPoolTest.java

/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed 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 com.android.volley.toolbox;

import static org.junit.Assert.assertNotSame;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;

import org.junit.Test;

public class ByteArrayPoolTest {
    @Test
    public void reusesBuffer() {
        ByteArrayPool pool = new ByteArrayPool(32);

        byte[] buf1 = pool.getBuf(16);
        byte[] buf2 = pool.getBuf(16);

        pool.returnBuf(buf1);
        pool.returnBuf(buf2);

        byte[] buf3 = pool.getBuf(16);
        byte[] buf4 = pool.getBuf(16);
        assertTrue(buf3 == buf1 || buf3 == buf2);
        assertTrue(buf4 == buf1 || buf4 == buf2);
        assertTrue(buf3 != buf4);
    }

    @Test
    public void obeysSizeLimit() {
        ByteArrayPool pool = new ByteArrayPool(32);

        byte[] buf1 = pool.getBuf(16);
        byte[] buf2 = pool.getBuf(16);
        byte[] buf3 = pool.getBuf(16);

        pool.returnBuf(buf1);
        pool.returnBuf(buf2);
        pool.returnBuf(buf3);

        byte[] buf4 = pool.getBuf(16);
        byte[] buf5 = pool.getBuf(16);
        byte[] buf6 = pool.getBuf(16);

        assertTrue(buf4 == buf2 || buf4 == buf3);
        assertTrue(buf5 == buf2 || buf5 == buf3);
        assertTrue(buf4 != buf5);
        assertTrue(buf6 != buf1 && buf6 != buf2 && buf6 != buf3);
    }

    @Test
    public void returnsBufferWithRightSize() {
        ByteArrayPool pool = new ByteArrayPool(32);

        byte[] buf1 = pool.getBuf(16);
        pool.returnBuf(buf1);

        byte[] buf2 = pool.getBuf(17);
        assertNotSame(buf2, buf1);

        byte[] buf3 = pool.getBuf(15);
        assertSame(buf3, buf1);
    }
}