PlatformDependent0Test Class — netty Architecture

Source Code

common/src/test/java/io/netty/util/internal/PlatformDependent0Test.java lines 27–94

public class PlatformDependent0Test {

    @BeforeAll
    public static void assumeUnsafe() {
        assumeTrue(PlatformDependent0.hasUnsafe());
        assumeTrue(PlatformDependent0.hasDirectBufferNoCleanerConstructor());
    }

    @Test
    public void testNewDirectBufferNegativeMemoryAddress() {
        testNewDirectBufferMemoryAddress(-1);
    }

    @Test
    public void testNewDirectBufferNonNegativeMemoryAddress() {
        testNewDirectBufferMemoryAddress(10);
    }

    @Test
    public void testNewDirectBufferZeroMemoryAddress() {
        PlatformDependent0.newDirectBuffer(0, 10);
    }

    private static void testNewDirectBufferMemoryAddress(long address) {
        assumeTrue(PlatformDependent0.hasDirectBufferNoCleanerConstructor());

        int capacity = 10;
        ByteBuffer buffer = PlatformDependent0.newDirectBuffer(address, capacity);
        assertEquals(address, PlatformDependent0.directBufferAddress(buffer));
        assertEquals(capacity, buffer.capacity());
    }

    @Test
    public void testMajorVersionFromJavaSpecificationVersion() {
        final SecurityManager current = System.getSecurityManager();

        try {
            System.setSecurityManager(new SecurityManager() {
                @Override
                public void checkPropertyAccess(String key) {
                    if (key.equals("java.specification.version")) {
                        // deny
                        throw new SecurityException(key);
                    }
                }

                // so we can restore the security manager
                @Override
                public void checkPermission(Permission perm) {
                }
            });

            assertEquals(6, PlatformDependent0.majorVersionFromJavaSpecificationVersion());
        } finally {
            System.setSecurityManager(current);
        }
    }

    @Test
    public void testMajorVersion() {
        assertEquals(6, PlatformDependent0.majorVersion("1.6"));
        assertEquals(7, PlatformDependent0.majorVersion("1.7"));
        assertEquals(8, PlatformDependent0.majorVersion("1.8"));
        assertEquals(8, PlatformDependent0.majorVersion("8"));
        assertEquals(9, PlatformDependent0.majorVersion("1.9")); // early version of JDK 9 before Project Verona
        assertEquals(9, PlatformDependent0.majorVersion("9"));
    }
}