Netty 4.1.107.Final · io.netty.util.internal.PlatformDependent

Modifier and Type	Class and Description
private static class	PlatformDependent.AtomicLongCounter
private static class	PlatformDependent.Mpsc
private static interface	PlatformDependent.ThreadLocalRandomProvider

Modifier and Type	Field and Description
private static final int	ADDRESS_SIZE
private static final String[]	ALLOWED_LINUX_OS_CLASSIFIERS
public static final boolean	BIG_ENDIAN_NATIVE_ORDER
private static final int	BIT_MODE
private static final long	BYTE_ARRAY_BASE_OFFSET
private static final boolean	CAN_ENABLE_TCP_NODELAY_BY_DEFAULT
private static final Cleaner	CLEANER
private static final boolean	DIRECT_BUFFER_PREFERRED
private static final AtomicLong	DIRECT_MEMORY_COUNTER
private static final long	DIRECT_MEMORY_LIMIT
private static final boolean	IS_IVKVM_DOT_NET
private static final boolean	IS_J9_JVM
private static final boolean	IS_OSX
private static final boolean	IS_WINDOWS
private static final String	LINUX_ID_LIKE_PREFIX
private static final String	LINUX_ID_PREFIX
private static final Set<String>	LINUX_OS_CLASSIFIERS
private static final InternalLogger	logger
private static final int	MAX_ALLOWED_MPSC_CAPACITY
private static final long	MAX_DIRECT_MEMORY
private static Pattern	MAX_DIRECT_MEMORY_SIZE_ARG_PATTERN
private static final boolean	MAYBE_SUPER_USER
private static final int	MIN_MAX_MPSC_CAPACITY
private static final int	MPSC_CHUNK_SIZE
private static final Cleaner	NOOP
private static final String	NORMALIZED_ARCH
private static final String	NORMALIZED_OS
private static final String[]	OS_RELEASE_FILES
private static final PlatformDependent.ThreadLocalRandomProvider	RANDOM_PROVIDER
private static final File	TMPDIR
private static final int	UNINITIALIZED_ARRAY_ALLOCATION_THRESHOLD
private static final Throwable	UNSAFE_UNAVAILABILITY_CAUSE
private static final boolean	USE_DIRECT_BUFFER_NO_CLEANER

Access	Constructor and Description
private	PlatformDependent()

Method Summary

Modifier and Type	Method and Description
private static void	addClassifier(Set<String> allowed classifiers allowed, Set<String> destination set dest, String... potential classifiers to add maybeClassifiers) Adds only those classifier strings to `dest` which are present in `allowed`.
pack-priv static void	addFilesystemOsClassifiers(final Set<String> allowedClassifiers, final Set<String> availableClassifiers)
pack-priv static boolean	addPropertyOsClassifiers(Set<String> allowedClassifiers, Set<String> availableClassifiers)
public static int	addressSize() Return the address size of the OS.
private static int	addressSize0()
public static long	align(long value, int alignment)
public static ByteBuffer	alignDirectBuffer(ByteBuffer buffer, int alignment)
public static ByteBuffer	allocateDirectNoCleaner(int capacity) Allocate a new `ByteBuffer` with the given `capacity`.
public static long	allocateMemory(long size)
public static byte[]	allocateUninitializedArray(int size)
public static int	bitMode() Returns the bit mode of the current VM (usually 32 or 64.)
private static int	bitMode0()
public static long	byteArrayBaseOffset()
private static long	byteArrayBaseOffset0()
public static boolean	canEnableTcpNoDelayByDefault() Returns `true` if and only if it is fine to enable TCP_NODELAY socket option by default.
public static void	copyMemory(long srcAddr, long dstAddr, long length)
public static void	copyMemory(byte[] src, int srcIndex, long dstAddr, long length)
public static void	copyMemory(byte[] src, int srcIndex, byte[] dst, int dstIndex, long length)
public static void	copyMemory(long srcAddr, byte[] dst, int dstIndex, long length)
public static File	createTempFile(String prefix, String suffix, File directory)
private static void	decrementMemoryCounter(int capacity)
public static ByteBuffer	directBuffer(long memoryAddress, int size)
public static long	directBufferAddress(ByteBuffer buffer)
public static boolean	directBufferPreferred() Returns `true` if the platform has reliable low-level direct buffer access API and a user has not specified `-Dio.netty.noPreferDirect` option.
public static boolean	equals(byte[] the first byte array. bytes1, int the position (inclusive) to start comparing in `bytes1`. startPos1, byte[] the second byte array. bytes2, int the position (inclusive) to start comparing in `bytes2`. startPos2, int the amount of bytes to compare. This is assumed to be validated as not going out of bounds by the caller. length) Compare two `byte` arrays for equality.
public static int	Returns: `0` if not equal. `1` if equal. equalsConstantTime(byte[] the first byte array. bytes1, int the position (inclusive) to start comparing in `bytes1`. startPos1, byte[] the second byte array. bytes2, int the position (inclusive) to start comparing in `bytes2`. startPos2, int the amount of bytes to compare. This is assumed to be validated as not going out of bounds by the caller. length) Compare two `byte` arrays for equality without leaking timing information.
private static boolean	equalsSafe(byte[] bytes1, int startPos1, byte[] bytes2, int startPos2, int length)
public static long	Returns: The estimated max direct memory, in bytes. estimateMaxDirectMemory() Compute an estimate of the maximum amount of direct memory available to this JVM.
public static void	freeDirectBuffer(ByteBuffer buffer) Try to deallocate the specified direct `ByteBuffer`.
public static void	freeDirectNoCleaner(ByteBuffer buffer) This method MUST only be called for `ByteBuffer`s that were allocated via `allocateDirectNoCleaner(int)`.
public static void	freeMemory(long address)
public static byte	getByte(long address)
public static byte	getByte(byte[] data, int index)
public static byte	getByte(byte[] data, long index)
public static ClassLoader	getClassLoader(final Class<?> clazz) Return the `ClassLoader` for the given `Class`.
public static ClassLoader	getContextClassLoader() Return the context `ClassLoader` for the current `Thread`.
public static int	getInt(Object object, long fieldOffset)
public static int	getInt(long address)
public static int	getInt(byte[] data, int index)
public static int	getInt(int[] data, long index)
private static int	getIntSafe(byte[] bytes, int offset)
public static int	getIntVolatile(long address)
public static long	getLong(long address)
public static long	getLong(byte[] data, int index)
public static long	getLong(long[] data, long index)
private static long	getLongSafe(byte[] bytes, int offset)
private static Pattern	getMaxDirectMemorySizeArgPattern()
public static Object	getObject(Object object, long fieldOffset)
public static short	getShort(long address)
public static short	getShort(byte[] data, int index)
private static short	getShortSafe(byte[] bytes, int offset)
public static ClassLoader	getSystemClassLoader() Return the system `ClassLoader`.
public static Throwable	getUnsafeUnavailabilityCause() Return the reason (if any) why `sun.misc.Unsafe` was not available.
public static boolean	hasAlignDirectByteBuffer()
public static boolean	hasDirectBufferNoCleanerConstructor()
public static int	Returns: The hash code of `bytes` assuming ASCII character encoding. The resulting hash code will be case insensitive. hashCodeAscii(byte[] The array which contains the data to hash. bytes, int What index to start generating a hash code in `bytes` startPos, int The amount of bytes that should be accounted for in the computation. length) Calculate a hash code of a byte array assuming ASCII character encoding.
public static int	Returns: The hash code of `bytes` assuming ASCII character encoding. The resulting hash code will be case insensitive. hashCodeAscii(CharSequence The array which contains the data to hash (assumed to be equivalent to a `byte[]`). bytes) Calculate a hash code of a byte array assuming ASCII character encoding.
private static int	hashCodeAsciiCompute(CharSequence value, int offset, int hash) Identical to `PlatformDependent0#hashCodeAsciiCompute(long, int)` but for `CharSequence`.
pack-priv static int	hashCodeAsciiSafe(byte[] bytes, int startPos, int length) Package private for testing purposes only!
private static int	hashCodeAsciiSanitizeByte(char value) Identical to `PlatformDependent0#hashCodeAsciiSanitize(byte)` but for `CharSequence`.
private static int	hashCodeAsciiSanitizeInt(CharSequence value, int offset) Identical to `PlatformDependent0#hashCodeAsciiSanitize(int)` but for `CharSequence`.
private static int	hashCodeAsciiSanitizeShort(CharSequence value, int offset) Identical to `PlatformDependent0#hashCodeAsciiSanitize(short)` but for `CharSequence`.
public static boolean	hasUnsafe() Return `true` if `sun.misc.Unsafe` was found on the classpath and can be used for accelerated direct memory access.
private static void	incrementMemoryCounter(int capacity)
public static boolean	isAndroid() Returns `true` if and only if the current platform is Android
public static boolean	isIkvmDotNet() Returns `true` if the running JVM is IKVM.NET, `false` otherwise.
private static boolean	isIkvmDotNet0()
public static boolean	isJ9Jvm() Returns `true` if the running JVM is either IBM J9 or Eclipse OpenJ9, `false` otherwise.
private static boolean	isJ9Jvm0()
public static boolean	isOsx() Return `true` if the JVM is running on OSX / MacOS
private static boolean	isOsx0()
public static boolean	isUnaligned() `true` if and only if the platform supports unaligned access.
public static boolean	isWindows() Return `true` if the JVM is running on Windows
private static boolean	isWindows0()
public static boolean	Returns: `false` if `bytes[startPos:startsPos+length)` contains a value other than zero. isZero(byte[] The byte array. bytes, int The starting index (inclusive) in `bytes`. startPos, int The amount of bytes to check for zero. length) Determine if a subsection of an array is zero.
private static boolean	isZeroSafe(byte[] bytes, int startPos, int length)
public static int	javaVersion() Return the version of Java under which this library is used.
public static long	maxDirectMemory() Returns the maximum memory reserved for direct buffer allocation.
public static boolean	maybeSuperUser() Return `true` if the current user may be a super-user.
private static boolean	maybeSuperUser0()
public static <C> Deque<C>	newConcurrentDeque() Returns a new concurrent `Deque`.
public static <K, V> ConcurrentMap<K, V>	newConcurrentHashMap() Creates a new fastest `ConcurrentMap` implementation for the current platform.
public static <K, V> ConcurrentMap<K, V>	newConcurrentHashMap(int initialCapacity) Creates a new fastest `ConcurrentMap` implementation for the current platform.
public static <K, V> ConcurrentMap<K, V>	newConcurrentHashMap(int initialCapacity, float loadFactor) Creates a new fastest `ConcurrentMap` implementation for the current platform.
public static <K, V> ConcurrentMap<K, V>	newConcurrentHashMap(int initialCapacity, float loadFactor, int concurrencyLevel) Creates a new fastest `ConcurrentMap` implementation for the current platform.
public static <K, V> ConcurrentMap<K, V>	newConcurrentHashMap(Map<? extends K, ? extends V> map) Creates a new fastest `ConcurrentMap` implementation for the current platform.
public static <T> Queue<T>	newFixedMpscQueue(int capacity) Create a new `Queue` which is safe to use for multiple producers (different threads) and a single consumer (one thread!) with the given fixes `capacity`.
public static LongCounter	newLongCounter() Creates a new fastest `LongCounter` implementation for the current platform.
public static <T> Queue<T>	Returns: A MPSC queue which may be unbounded. newMpscQueue() Create a new `Queue` which is safe to use for multiple producers (different threads) and a single consumer (one thread!).
public static <T> Queue<T>	newMpscQueue(final int maxCapacity) Create a new `Queue` which is safe to use for multiple producers (different threads) and a single consumer (one thread!).
public static <T> Queue<T>	newMpscQueue(final int chunkSize, final int maxCapacity) Create a new `Queue` which is safe to use for multiple producers (different threads) and a single consumer (one thread!).
public static <T> Queue<T>	newSpscQueue() Create a new `Queue` which is safe to use for single producer (one thread!) and a single consumer (one thread!).
private static String	normalize(String value)
private static String	normalizeArch(String value)
public static String	normalizedArch()
public static Set<String>	normalizedLinuxClassifiers()
public static String	normalizedOs()
private static String	normalizeOs(String value)
private static String	normalizeOsReleaseVariableValue(String value)
public static long	objectFieldOffset(Field field)
public static void	putByte(long address, byte value)
public static void	putByte(byte[] data, int index, byte value)
public static void	putByte(Object data, long offset, byte value)
public static void	putInt(long address, int value)
public static void	putInt(byte[] data, int index, int value)
public static void	putIntOrdered(long adddress, int newValue)
public static void	putLong(long address, long value)
public static void	putLong(byte[] data, int index, long value)
public static void	putObject(Object o, long offset, Object x)
public static void	putShort(long address, short value)
public static void	putShort(byte[] data, int index, short value)
public static ByteBuffer	reallocateDirectNoCleaner(ByteBuffer buffer, int capacity) Reallocate a new `ByteBuffer` with the given `capacity`.
public static long	reallocateMemory(long address, long newSize)
pack-priv static void	safeConstructPutInt(Object object, long fieldOffset, int value)
public static void	setMemory(byte[] dst, int dstIndex, long bytes, byte value)
public static void	setMemory(long address, long bytes, byte value)
public static Random	threadLocalRandom() Return a `Random` which is not-threadsafe and so can only be used from the same thread.
public static void	throwException(Throwable t) Raises an exception bypassing compiler checks for checked exceptions.
private static <E extends Throwable> void	throwException0(Throwable t)
public static File	tmpdir() Returns the temporary directory.
private static File	tmpdir0()
private static File	toDirectory(String path)
private static Throwable	unsafeUnavailabilityCause0()
public static long	usedDirectMemory() Returns the current memory reserved for direct buffer allocation.
public static boolean	useDirectBufferNoCleaner()

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

public final Class PlatformDependent

Nested and Inner Type Summary

Field Summary

Constructor Summary

Method Summary