Quelle Buffer.java

Sprache: JAVA

/*
* Copyright (c) 2000, 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* questions.
*/

package java.nio;

import jdk.internal.access.JavaNioAccess;
import jdk.internal.access.SharedSecrets;
import jdk.internal.access.foreign.UnmapperProxy;
import jdk.internal.foreign.AbstractMemorySegmentImpl;
import jdk.internal.foreign.MemorySessionImpl;
import jdk.internal.misc.ScopedMemoryAccess;
import jdk.internal.misc.Unsafe;
import jdk.internal.misc.VM.BufferPool;
import jdk.internal.vm.annotation.ForceInline;

import java.io.FileDescriptor;
import java.lang.foreign.MemorySegment;
import java.lang.ref.Reference;
import java.util.Objects;
import java.util.Spliterator;

/**
* A container for data of a specific primitive type.
*
* A buffer is a linear, finite sequence of elements of a specific
* primitive type. Aside from its content, the essential properties of a
* buffer are its capacity, limit, and position: 
*
* <blockquote>
*
* A buffer's capacity is the number of elements it contains. The
* capacity of a buffer is never negative and never changes. 
*
* A buffer's limit is the index of the first element that should
* not be read or written. A buffer's limit is never negative and is never
* greater than its capacity. 
*
* A buffer's position is the index of the next element to be
* read or written. A buffer's position is never negative and is never
* greater than its limit. 
*
* </blockquote>
*
* There is one subclass of this class for each non-boolean primitive type.
*
*
* <h2> Transferring data </h2>
*
* Each subclass of this class defines two categories of get and
* put operations: 
*
* <blockquote>
*
* Relative operations read or write one or more elements starting
* at the current position and then increment the position by the number of
* elements transferred. If the requested transfer exceeds the limit then a
* relative get operation throws a {@link BufferUnderflowException}
* and a relative put operation throws a {@link
* BufferOverflowException}; in either case, no data is transferred. 
*
* Absolute operations take an explicit element index and do not
* affect the position. Absolute get and put operations throw
* an {@link IndexOutOfBoundsException} if the index argument exceeds the
* limit. 
*
* </blockquote>
*
* Data may also, of course, be transferred in to or out of a buffer by the
* I/O operations of an appropriate channel, which are always relative to the
* current position.
*
*
* <h2> Marking and resetting </h2>
*
* A buffer's mark is the index to which its position will be reset
* when the {@link #reset reset} method is invoked. The mark is not always
* defined, but when it is defined it is never negative and is never greater
* than the position. If the mark is defined then it is discarded when the
* position or the limit is adjusted to a value smaller than the mark. If the
* mark is not defined then invoking the {@link #reset reset} method causes an
* {@link InvalidMarkException} to be thrown.
*
*
* <h2> Invariants </h2>
*
* The following invariant holds for the mark, position, limit, and
* capacity values:
*
* <blockquote>
* {@code 0} {@code <=}
* mark {@code <=}
* position {@code <=}
* limit {@code <=}
* capacity
* </blockquote>
*
* A newly-created buffer always has a position of zero and a mark that is
* undefined. The initial limit may be zero, or it may be some other value
* that depends upon the type of the buffer and the manner in which it is
* constructed. Each element of a newly-allocated buffer is initialized
* to zero.
*
*
* <h2> Additional operations </h2>
*
* In addition to methods for accessing the position, limit, and capacity
* values and for marking and resetting, this class also defines the following
* operations upon buffers:
*
* <ul>
*
* <li> {@link #clear} makes a buffer ready for a new sequence of
* channel-read or relative put operations: It sets the limit to the
* capacity and the position to zero. </li>
*
* <li> {@link #flip} makes a buffer ready for a new sequence of
* channel-write or relative get operations: It sets the limit to the
* current position and then sets the position to zero. </li>
*
* <li> {@link #rewind} makes a buffer ready for re-reading the data that
* it already contains: It leaves the limit unchanged and sets the position
* to zero. </li>
*
* <li> The {@link #slice} and {@link #slice(int,int) slice(index,length)}
* methods create a subsequence of a buffer: They leave the limit and the
* position unchanged. </li>
*
* <li> {@link #duplicate} creates a shallow copy of a buffer: It leaves
* the limit and the position unchanged. </li>
*
* </ul>
*
*
* <h2> Read-only buffers </h2>
*
* Every buffer is readable, but not every buffer is writable. The
* mutation methods of each buffer class are specified as optional
* operations that will throw a {@link ReadOnlyBufferException} when
* invoked upon a read-only buffer. A read-only buffer does not allow its
* content to be changed, but its mark, position, and limit values are mutable.
* Whether or not a buffer is read-only may be determined by invoking its
* {@link #isReadOnly isReadOnly} method.
*
*
* <h2> Thread safety </h2>
*
* Buffers are not safe for use by multiple concurrent threads. If a
* buffer is to be used by more than one thread then access to the buffer
* should be controlled by appropriate synchronization.
*
*
* <h2> Invocation chaining </h2>
*
* Methods in this class that do not otherwise have a value to return are
* specified to return the buffer upon which they are invoked. This allows
* method invocations to be chained; for example, the sequence of statements
*
* <blockquote><pre>
* b.flip();
* b.position(23);
* b.limit(42);</pre></blockquote>
*
* can be replaced by the single, more compact statement
*
* <blockquote><pre>
* b.flip().position(23).limit(42);</pre></blockquote>
*
*
* @author Mark Reinhold
* @author JSR-51 Expert Group
* @since 1.4
* @sealedGraph
*/

public abstract sealed class Buffer
 permits ByteBuffer, CharBuffer, DoubleBuffer, FloatBuffer, IntBuffer,
 LongBuffer, ShortBuffer {
 // Cached unsafe-access object
 static final Unsafe UNSAFE = Unsafe.getUnsafe();

 static final ScopedMemoryAccess SCOPED_MEMORY_ACCESS = ScopedMemoryAccess.getScopedMemoryAccess();

 /**
 * The characteristics of Spliterators that traverse and split elements
 * maintained in Buffers.
 */
 static final int SPLITERATOR_CHARACTERISTICS =
 Spliterator.SIZED | Spliterator.SUBSIZED | Spliterator.ORDERED;

 // Invariants: mark <= position <= limit <= capacity
 private int mark = -1;
 private int position = 0;
 private int limit;
 private int capacity;

 // Used by heap byte buffers or direct buffers with Unsafe access
 // For heap byte buffers this field will be the address relative to the
 // array base address and offset into that array. The address might
 // not align on a word boundary for slices, nor align at a long word
 // (8 byte) boundary for byte[] allocations on 32-bit systems.
 // For direct buffers it is the start address of the memory region. The
 // address might not align on a word boundary for slices, nor when created
 // using JNI, see NewDirectByteBuffer(void*, long).
 // Should ideally be declared final
 // NOTE: hoisted here for speed in JNI GetDirectBufferAddress
 long address;

 // Used by buffers generated by the memory access API (JEP-370)
 final MemorySegment segment;

 // Creates a new buffer with given address and capacity.
 //
 Buffer(long addr, int cap, MemorySegment segment) {
 this.address = addr;
 this.capacity = cap;
 this.segment = segment;
 }

 // Creates a new buffer with the given mark, position, limit, and capacity,
 // after checking invariants.
 //
 Buffer(int mark, int pos, int lim, int cap, MemorySegment segment) { // package-private
 if (cap < 0)
 throw createCapacityException(cap);
 this.capacity = cap;
 this.segment = segment;
 limit(lim);
 position(pos);
 if (mark >= 0) {
 if (mark > pos)
 throw new IllegalArgumentException("mark > position: ("
 + mark + " > " + pos + ")");
 this.mark = mark;
 }
 }

 /**
 * Returns an {@code IllegalArgumentException} indicating that the source
 * and target are the same {@code Buffer}. Intended for use in
 * {@code put(src)} when the parameter is the {@code Buffer} on which the
 * method is being invoked.
 *
 * @return IllegalArgumentException
 * With a message indicating equal source and target buffers
 */
 static IllegalArgumentException createSameBufferException() {
 return new IllegalArgumentException("The source buffer is this buffer");
 }

 /**
 * Verify that the capacity is nonnegative.
 *
 * @param capacity
 * The new buffer's capacity, in $type$s
 *
 * @throws IllegalArgumentException
 * If the {@code capacity} is a negative integer
 */
 static IllegalArgumentException createCapacityException(int capacity) {
 assert capacity < 0 : "capacity expected to be negative";
 return new IllegalArgumentException("capacity < 0: ("
 + capacity + " < 0)");
 }

 /**
 * Returns this buffer's capacity.
 *
 * @return The capacity of this buffer
 */
 public final int capacity() {
 return capacity;
 }

 /**
 * Returns this buffer's position.
 *
 * @return The position of this buffer
 */
 public final int position() {
 return position;
 }

 /**
 * Sets this buffer's position. If the mark is defined and larger than the
 * new position then it is discarded.
 *
 * @param newPosition
 * The new position value; must be non-negative
 * and no larger than the current limit
 *
 * @return This buffer
 *
 * @throws IllegalArgumentException
 * If the preconditions on {@code newPosition} do not hold
 */
 public Buffer position(int newPosition) {
 if (newPosition > limit | newPosition < 0)
 throw createPositionException(newPosition);
 if (mark > newPosition) mark = -1;
 position = newPosition;
 return this;
 }

 /**
 * Verify that {@code 0 < newPosition <= limit}
 *
 * @param newPosition
 * The new position value
 *
 * @throws IllegalArgumentException
 * If the specified position is out of bounds.
 */
 private IllegalArgumentException createPositionException(int newPosition) {
 String msg = null;

 if (newPosition > limit) {
 msg = "newPosition > limit: (" + newPosition + " > " + limit + ")";
 } else { // assume negative
 assert newPosition < 0 : "newPosition expected to be negative";
 msg = "newPosition < 0: (" + newPosition + " < 0)";
 }

 return new IllegalArgumentException(msg);
 }

 /**
 * Returns this buffer's limit.
 *
 * @return The limit of this buffer
 */
 public final int limit() {
 return limit;
 }

 /**
 * Sets this buffer's limit. If the position is larger than the new limit
 * then it is set to the new limit. If the mark is defined and larger than
 * the new limit then it is discarded.
 *
 * @param newLimit
 * The new limit value; must be non-negative
 * and no larger than this buffer's capacity
 *
 * @return This buffer
 *
 * @throws IllegalArgumentException
 * If the preconditions on {@code newLimit} do not hold
 */
 public Buffer limit(int newLimit) {
 if (newLimit > capacity | newLimit < 0)
 throw createLimitException(newLimit);
 limit = newLimit;
 if (position > newLimit) position = newLimit;
 if (mark > newLimit) mark = -1;
 return this;
 }

 /**
 * Verify that {@code 0 < newLimit <= capacity}
 *
 * @param newLimit
 * The new limit value
 *
 * @throws IllegalArgumentException
 * If the specified limit is out of bounds.
 */
 private IllegalArgumentException createLimitException(int newLimit) {
 String msg = null;

 if (newLimit > capacity) {
 msg = "newLimit > capacity: (" + newLimit + " > " + capacity + ")";
 } else { // assume negative
 assert newLimit < 0 : "newLimit expected to be negative";
 msg = "newLimit < 0: (" + newLimit + " < 0)";
 }

 return new IllegalArgumentException(msg);
 }

 /**
 * Sets this buffer's mark at its position.
 *
 * @return This buffer
 */
 public Buffer mark() {
 mark = position;
 return this;
 }

 /**
 * Resets this buffer's position to the previously-marked position.
 *
 * Invoking this method neither changes nor discards the mark's
 * value. 
 *
 * @return This buffer
 *
 * @throws InvalidMarkException
 * If the mark has not been set
 */
 public Buffer reset() {
 int m = mark;
 if (m < 0)
 throw new InvalidMarkException();
 position = m;
 return this;
 }

 /**
 * Clears this buffer. The position is set to zero, the limit is set to
 * the capacity, and the mark is discarded.
 *
 * Invoke this method before using a sequence of channel-read or
 * put operations to fill this buffer. For example:
 *
 * <blockquote><pre>
 * buf.clear(); // Prepare buffer for reading
 * in.read(buf); // Read data</pre></blockquote>
 *
 * This method does not actually erase the data in the buffer, but it
 * is named as if it did because it will most often be used in situations
 * in which that might as well be the case. 
 *
 * @return This buffer
 */
 public Buffer clear() {
 position = 0;
 limit = capacity;
 mark = -1;
 return this;
 }

 /**
 * Flips this buffer. The limit is set to the current position and then
 * the position is set to zero. If the mark is defined then it is
 * discarded.
 *
 * After a sequence of channel-read or put operations, invoke
 * this method to prepare for a sequence of channel-write or relative
 * get operations. For example:
 *
 * <blockquote><pre>
 * buf.put(magic); // Prepend header
 * in.read(buf); // Read data into rest of buffer
 * buf.flip(); // Flip buffer
 * out.write(buf); // Write header + data to channel</pre></blockquote>
 *
 * This method is often used in conjunction with the {@link
 * java.nio.ByteBuffer#compact compact} method when transferring data from
 * one place to another. 
 *
 * @return This buffer
 */
 public Buffer flip() {
 limit = position;
 position = 0;
 mark = -1;
 return this;
 }

 /**
 * Rewinds this buffer. The position is set to zero and the mark is
 * discarded.
 *
 * Invoke this method before a sequence of channel-write or get
 * operations, assuming that the limit has already been set
 * appropriately. For example:
 *
 * <blockquote><pre>
 * out.write(buf); // Write remaining data
 * buf.rewind(); // Rewind buffer
 * buf.get(array); // Copy data into array</pre></blockquote>
 *
 * @return This buffer
 */
 public Buffer rewind() {
 position = 0;
 mark = -1;
 return this;
 }

 /**
 * Returns the number of elements between the current position and the
 * limit.
 *
 * @return The number of elements remaining in this buffer
 */
 public final int remaining() {
 int rem = limit - position;
 return rem > 0 ? rem : 0;
 }

 /**
 * Tells whether there are any elements between the current position and
 * the limit.
 *
 * @return {@code true} if, and only if, there is at least one element
 * remaining in this buffer
 */
 public final boolean hasRemaining() {
 return position < limit;
 }

 /**
 * Tells whether or not this buffer is read-only.
 *
 * @return {@code true} if, and only if, this buffer is read-only
 */
 public abstract boolean isReadOnly();

 /**
 * Tells whether or not this buffer is backed by an accessible
 * array.
 *
 * If this method returns {@code true} then the {@link #array() array}
 * and {@link #arrayOffset() arrayOffset} methods may safely be invoked.
 * 
 *
 * @return {@code true} if, and only if, this buffer
 * is backed by an array and is not read-only
 *
 * @since 1.6
 */
 public abstract boolean hasArray();

 /**
 * Returns the array that backs this
 * buffer  (optional operation).
 *
 * This method is intended to allow array-backed buffers to be
 * passed to native code more efficiently. Concrete subclasses
 * provide more strongly-typed return values for this method.
 *
 * Modifications to this buffer's content will cause the returned
 * array's content to be modified, and vice versa.
 *
 * Invoke the {@link #hasArray hasArray} method before invoking this
 * method in order to ensure that this buffer has an accessible backing
 * array. 
 *
 * @return The array that backs this buffer
 *
 * @throws ReadOnlyBufferException
 * If this buffer is backed by an array but is read-only
 *
 * @throws UnsupportedOperationException
 * If this buffer is not backed by an accessible array
 *
 * @since 1.6
 */
 public abstract Object array();

 /**
 * Returns the offset within this buffer's backing array of the first
 * element of the buffer  (optional operation).
 *
 * If this buffer is backed by an array then buffer position p
 * corresponds to array index p + {@code arrayOffset()}.
 *
 * Invoke the {@link #hasArray hasArray} method before invoking this
 * method in order to ensure that this buffer has an accessible backing
 * array. 
 *
 * @return The offset within this buffer's array
 * of the first element of the buffer
 *
 * @throws ReadOnlyBufferException
 * If this buffer is backed by an array but is read-only
 *
 * @throws UnsupportedOperationException
 * If this buffer is not backed by an accessible array
 *
 * @since 1.6
 */
 public abstract int arrayOffset();

 /**
 * Tells whether or not this buffer is
 * <a href="ByteBuffer.html#direct">direct</a>.
 *
 * @return {@code true} if, and only if, this buffer is direct
 *
 * @since 1.6
 */
 public abstract boolean isDirect();

 /**
 * Creates a new buffer whose content is a shared subsequence of
 * this buffer's content.
 *
 * The content of the new buffer will start at this buffer's current
 * position. Changes to this buffer's content will be visible in the new
 * buffer, and vice versa; the two buffers' position, limit, and mark
 * values will be independent.
 *
 * The new buffer's position will be zero, its capacity and its limit
 * will be the number of elements remaining in this buffer, its mark will be
 * undefined. The new buffer will be direct if, and only if, this buffer is
 * direct, and it will be read-only if, and only if, this buffer is
 * read-only. 
 *
 * @return The new buffer
 *
 * @since 9
 */
 public abstract Buffer slice();

 /**
 * Creates a new buffer whose content is a shared subsequence of
 * this buffer's content.
 *
 * The content of the new buffer will start at position {@code index}
 * in this buffer, and will contain {@code length} elements. Changes to
 * this buffer's content will be visible in the new buffer, and vice versa;
 * the two buffers' position, limit, and mark values will be independent.
 *
 * The new buffer's position will be zero, its capacity and its limit
 * will be {@code length}, its mark will be undefined. The new buffer will
 * be direct if, and only if, this buffer is direct, and it will be
 * read-only if, and only if, this buffer is read-only. 
 *
 * @param index
 * The position in this buffer at which the content of the new
 * buffer will start; must be non-negative and no larger than
 * {@link #limit() limit()}
 *
 * @param length
 * The number of elements the new buffer will contain; must be
 * non-negative and no larger than {@code limit() - index}
 *
 * @return The new buffer
 *
 * @throws IndexOutOfBoundsException
 * If {@code index} is negative or greater than {@code limit()},
 * {@code length} is negative, or {@code length > limit() - index}
 *
 * @since 13
 */
 public abstract Buffer slice(int index, int length);

 /**
 * Creates a new buffer that shares this buffer's content.
 *
 * The content of the new buffer will be that of this buffer. Changes
 * to this buffer's content will be visible in the new buffer, and vice
 * versa; the two buffers' position, limit, and mark values will be
 * independent.
 *
 * The new buffer's capacity, limit, position and mark values will be
 * identical to those of this buffer. The new buffer will be direct if, and
 * only if, this buffer is direct, and it will be read-only if, and only if,
 * this buffer is read-only. 
 *
 * @return The new buffer
 *
 * @since 9
 */
 public abstract Buffer duplicate();

 // -- Package-private methods for bounds checking, etc. --

 /**
 *
 * @return the base reference, paired with the address
 * field, which in combination can be used for unsafe access into a heap
 * buffer or direct byte buffer (and views of).
 */
 abstract Object base();

 /**
 * Checks the current position against the limit, throwing a {@link
 * BufferUnderflowException} if it is not smaller than the limit, and then
 * increments the position.
 *
 * @return The current position value, before it is incremented
 */
 final int nextGetIndex() { // package-private
 int p = position;
 if (p >= limit)
 throw new BufferUnderflowException();
 position = p + 1;
 return p;
 }

 final int nextGetIndex(int nb) { // package-private
 int p = position;
 if (limit - p < nb)
 throw new BufferUnderflowException();
 position = p + nb;
 return p;
 }

 /**
 * Checks the current position against the limit, throwing a {@link
 * BufferOverflowException} if it is not smaller than the limit, and then
 * increments the position.
 *
 * @return The current position value, before it is incremented
 */
 final int nextPutIndex() { // package-private
 int p = position;
 if (p >= limit)
 throw new BufferOverflowException();
 position = p + 1;
 return p;
 }

 final int nextPutIndex(int nb) { // package-private
 int p = position;
 if (limit - p < nb)
 throw new BufferOverflowException();
 position = p + nb;
 return p;
 }

 /**
 * Checks the given index against the limit, throwing an {@link
 * IndexOutOfBoundsException} if it is not smaller than the limit
 * or is smaller than zero.
 */
 final int checkIndex(int i) { // package-private
 return Objects.checkIndex(i, limit);
 }

 final int checkIndex(int i, int nb) { // package-private
 if ((i < 0) || (nb > limit - i))
 throw new IndexOutOfBoundsException();
 return i;
 }

 final int markValue() { // package-private
 return mark;
 }

 final void discardMark() { // package-private
 mark = -1;
 }

 @ForceInline
 final MemorySessionImpl session() {
 if (segment != null) {
 return ((AbstractMemorySegmentImpl)segment).sessionImpl();
 } else {
 return null;
 }
 }

 final void checkSession() {
 MemorySessionImpl session = session();
 if (session != null) {
 session.checkValidState();
 }
 }

 static {
 // setup access to this package in SharedSecrets
 SharedSecrets.setJavaNioAccess(
 new JavaNioAccess() {

 @Override
 public BufferPool getDirectBufferPool() {
 return Bits.BUFFER_POOL;
 }

 @Override
 public ByteBuffer newDirectByteBuffer(long addr, int cap, Object obj, MemorySegment segment) {
 return new DirectByteBuffer(addr, cap, obj, segment);
 }

 @Override
 public ByteBuffer newMappedByteBuffer(UnmapperProxy unmapperProxy, long address, int cap, Object obj, MemorySegment segment) {
 return new DirectByteBuffer(address, cap, obj, unmapperProxy.fileDescriptor(), unmapperProxy.isSync(), segment);
 }

 @Override
 public ByteBuffer newHeapByteBuffer(byte[] hb, int offset, int capacity, MemorySegment segment) {
 return new HeapByteBuffer(hb, -1, 0, capacity, capacity, offset, segment);
 }

 @Override
 public Object getBufferBase(Buffer buffer) {
 return buffer.base();
 }

 @Override
 public long getBufferAddress(Buffer buffer) {
 return buffer.address;
 }

 @Override
 public UnmapperProxy unmapper(Buffer buffer) {
 if (buffer instanceof MappedByteBuffer mbb) {
 return mbb.unmapper();
 } else {
 return null;
 }
 }

 @Override
 public MemorySegment bufferSegment(Buffer buffer) {
 return buffer.segment;
 }

 @Override
 public void acquireSession(Buffer buffer) {
 var scope = buffer.session();
 if (scope != null) {
 scope.acquire0();
 }
 }

 @Override
 public void releaseSession(Buffer buffer) {
 try {
 var scope = buffer.session();
 if (scope != null) {
 scope.release0();
 }
 } finally {
 Reference.reachabilityFence(buffer);
 }
 }

 @Override
 public boolean isThreadConfined(Buffer buffer) {
 var scope = buffer.session();
 return scope != null && scope.ownerThread() != null;
 }

 @Override
 public boolean hasSession(Buffer buffer) {
 return buffer.session() != null;
 }

 @Override
 public void force(FileDescriptor fd, long address, boolean isSync, long offset, long size) {
 MappedMemoryUtils.force(fd, address, isSync, offset, size);
 }

 @Override
 public void load(long address, boolean isSync, long size) {
 MappedMemoryUtils.load(address, isSync, size);
 }

 @Override
 public void unload(long address, boolean isSync, long size) {
 MappedMemoryUtils.unload(address, isSync, size);
 }

 @Override
 public boolean isLoaded(long address, boolean isSync, long size) {
 return MappedMemoryUtils.isLoaded(address, isSync, size);
 }

 @Override
 public void reserveMemory(long size, long cap) {
 Bits.reserveMemory(size, cap);
 }

 @Override
 public void unreserveMemory(long size, long cap) {
 Bits.unreserveMemory(size, cap);
 }

 @Override
 public int pageSize() {
 return Bits.pageSize();
 }
 });
 }

}

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