Added CompactByteString
* CompactByteString provides an instance of ByteString that is guaranteed to be compact and has performance-optimized element acces (since no range-checking is necessary) * sealed abstract class ByteString, since the implementations of ByteString1 and ByteStings assume a fixed set of ByteString classes (in pattern matching).
This commit is contained in:
Oliver Schulz
parent
670bb396f9
commit
ecef10eabc
1 changed files with 130 additions and 36 deletions
|
|
@ -16,31 +16,23 @@ object ByteString {
|
|||
/**
|
||||
* Creates a new ByteString by copying a byte array.
|
||||
*/
|
||||
def apply(bytes: Array[Byte]): ByteString = ByteString1(bytes.clone)
|
||||
def apply(bytes: Array[Byte]): ByteString = CompactByteString(bytes)
|
||||
|
||||
/**
|
||||
* Creates a new ByteString by copying bytes.
|
||||
*/
|
||||
def apply(bytes: Byte*): ByteString = {
|
||||
val ar = new Array[Byte](bytes.size)
|
||||
bytes.copyToArray(ar)
|
||||
ByteString1(ar)
|
||||
}
|
||||
def apply(bytes: Byte*): ByteString = CompactByteString(bytes: _*)
|
||||
|
||||
/**
|
||||
* Creates a new ByteString by converting from integral numbers to bytes.
|
||||
*/
|
||||
def apply[T](bytes: T*)(implicit num: Integral[T]): ByteString =
|
||||
ByteString1(bytes.map(x ⇒ num.toInt(x).toByte)(collection.breakOut))
|
||||
CompactByteString(bytes: _*)(num)
|
||||
|
||||
/**
|
||||
* Creates a new ByteString by copying bytes from a ByteBuffer.
|
||||
*/
|
||||
def apply(bytes: ByteBuffer): ByteString = {
|
||||
val ar = new Array[Byte](bytes.remaining)
|
||||
bytes.get(ar)
|
||||
ByteString1(ar)
|
||||
}
|
||||
def apply(bytes: ByteBuffer): ByteString = CompactByteString(bytes)
|
||||
|
||||
/**
|
||||
* Creates a new ByteString by encoding a String as UTF-8.
|
||||
|
|
@ -50,24 +42,16 @@ object ByteString {
|
|||
/**
|
||||
* Creates a new ByteString by encoding a String with a charset.
|
||||
*/
|
||||
def apply(string: String, charset: String): ByteString = ByteString1(string.getBytes(charset))
|
||||
def apply(string: String, charset: String): ByteString = CompactByteString(string, charset)
|
||||
|
||||
/**
|
||||
* Creates a new ByteString by copying length bytes starting at offset from
|
||||
* an Array.
|
||||
*/
|
||||
def fromArray(array: Array[Byte], offset: Int, length: Int): ByteString = {
|
||||
val copyOffset = math.max(offset, 0)
|
||||
val copyLength = math.max(math.min(array.length - copyOffset, length), 0)
|
||||
if (copyLength == 0) empty
|
||||
else {
|
||||
val copyArray = new Array[Byte](copyLength)
|
||||
Array.copy(array, copyOffset, copyArray, 0, copyLength)
|
||||
ByteString1(copyArray)
|
||||
}
|
||||
}
|
||||
def fromArray(array: Array[Byte], offset: Int, length: Int): ByteString =
|
||||
CompactByteString.fromArray(array, offset, length)
|
||||
|
||||
val empty: ByteString = ByteString1(Array.empty[Byte])
|
||||
val empty: ByteString = CompactByteString(Array.empty[Byte])
|
||||
|
||||
def newBuilder = new ByteStringBuilder
|
||||
|
||||
|
|
@ -76,6 +60,46 @@ object ByteString {
|
|||
def apply() = newBuilder
|
||||
}
|
||||
|
||||
private[akka] object ByteStringCompact {
|
||||
def apply(bytes: Array[Byte]) = new ByteStringCompact(bytes)
|
||||
}
|
||||
|
||||
/**
|
||||
* Implementation of CompactByteString.
|
||||
*/
|
||||
@SerialVersionUID(8153715304510848081L)
|
||||
final class ByteStringCompact private (private val bytes: Array[Byte]) extends CompactByteString {
|
||||
def apply(idx: Int): Byte = bytes(idx)
|
||||
|
||||
override def length = bytes.length
|
||||
|
||||
def toArray: Array[Byte] = bytes.clone
|
||||
|
||||
def toByteString1: ByteString1 = ByteString1(bytes)
|
||||
|
||||
override def clone: ByteStringCompact = new ByteStringCompact(toArray)
|
||||
|
||||
def compact: ByteStringCompact = this
|
||||
|
||||
def asByteBuffer: ByteBuffer =
|
||||
toByteString1.asByteBuffer
|
||||
|
||||
def decodeString(charset: String): String = new String(bytes, charset)
|
||||
|
||||
def ++(that: ByteString): ByteString =
|
||||
if (!that.isEmpty) toByteString1 ++ that else this
|
||||
|
||||
override def slice(from: Int, until: Int): ByteString =
|
||||
if ((from != 0) || (until != length)) toByteString1.slice(from, until)
|
||||
else this
|
||||
|
||||
override def copyToArray[A >: Byte](xs: Array[A], start: Int, len: Int): Unit =
|
||||
toByteString1.copyToArray(xs, start, len)
|
||||
|
||||
def copyToBuffer(buffer: ByteBuffer): Int =
|
||||
toByteString1.copyToBuffer(buffer)
|
||||
}
|
||||
|
||||
private[akka] object ByteString1 {
|
||||
def apply(bytes: Array[Byte]) = new ByteString1(bytes)
|
||||
}
|
||||
|
|
@ -102,10 +126,10 @@ object ByteString {
|
|||
ar
|
||||
}
|
||||
|
||||
override def clone: ByteString = new ByteString1(toArray)
|
||||
override def clone: CompactByteString = ByteStringCompact(toArray)
|
||||
|
||||
def compact: ByteString =
|
||||
if (length == bytes.length) this else clone
|
||||
def compact: CompactByteString =
|
||||
if (length == bytes.length) ByteStringCompact(bytes) else clone
|
||||
|
||||
def asByteBuffer: ByteBuffer = {
|
||||
val buffer = ByteBuffer.wrap(bytes, startIndex, length).asReadOnlyBuffer
|
||||
|
|
@ -117,6 +141,7 @@ object ByteString {
|
|||
new String(if (length == bytes.length) bytes else toArray, charset)
|
||||
|
||||
def ++(that: ByteString): ByteString = that match {
|
||||
case b: ByteStringCompact ⇒ ByteStrings(this, b.toByteString1)
|
||||
case b: ByteString1 ⇒ ByteStrings(this, b)
|
||||
case bs: ByteStrings ⇒ ByteStrings(this, bs)
|
||||
}
|
||||
|
|
@ -234,18 +259,19 @@ object ByteString {
|
|||
}
|
||||
|
||||
def ++(that: ByteString): ByteString = that match {
|
||||
case b: ByteStringCompact ⇒ ByteStrings(this, b.toByteString1)
|
||||
case b: ByteString1 ⇒ ByteStrings(this, b)
|
||||
case bs: ByteStrings ⇒ ByteStrings(this, bs)
|
||||
}
|
||||
|
||||
def compact: ByteString = {
|
||||
def compact: CompactByteString = {
|
||||
val ar = new Array[Byte](length)
|
||||
var pos = 0
|
||||
bytestrings foreach { b ⇒
|
||||
b.copyToArray(ar, pos, b.length)
|
||||
pos += b.length
|
||||
}
|
||||
ByteString1(ar)
|
||||
ByteStringCompact(ar)
|
||||
}
|
||||
|
||||
def asByteBuffer: ByteBuffer = compact.asByteBuffer
|
||||
|
|
@ -272,7 +298,7 @@ object ByteString {
|
|||
*
|
||||
* TODO: Add performance characteristics
|
||||
*/
|
||||
abstract class ByteString extends IndexedSeq[Byte] with IndexedSeqOptimized[Byte, ByteString] {
|
||||
sealed abstract class ByteString extends IndexedSeq[Byte] with IndexedSeqOptimized[Byte, ByteString] {
|
||||
override protected[this] def newBuilder = ByteString.newBuilder
|
||||
|
||||
/**
|
||||
|
|
@ -293,7 +319,7 @@ abstract class ByteString extends IndexedSeq[Byte] with IndexedSeqOptimized[Byte
|
|||
* Create a new ByteString with all contents compacted into a single
|
||||
* byte array.
|
||||
*/
|
||||
def compact: ByteString
|
||||
def compact: CompactByteString
|
||||
|
||||
/**
|
||||
* Returns a read-only ByteBuffer that directly wraps this ByteString
|
||||
|
|
@ -323,13 +349,77 @@ abstract class ByteString extends IndexedSeq[Byte] with IndexedSeqOptimized[Byte
|
|||
final def mapI(f: Byte ⇒ Int): ByteString = map(f andThen (_.toByte))
|
||||
}
|
||||
|
||||
object CompactByteString {
|
||||
/**
|
||||
* Creates a new CompactByteString by copying a byte array.
|
||||
*/
|
||||
def apply(bytes: Array[Byte]): CompactByteString = ByteString.ByteStringCompact(bytes.clone)
|
||||
|
||||
/**
|
||||
* Creates a new CompactByteString by copying bytes.
|
||||
*/
|
||||
def apply(bytes: Byte*): CompactByteString = {
|
||||
val ar = new Array[Byte](bytes.size)
|
||||
bytes.copyToArray(ar)
|
||||
CompactByteString(ar)
|
||||
}
|
||||
|
||||
/**
|
||||
* Creates a new CompactByteString by converting from integral numbers to bytes.
|
||||
*/
|
||||
def apply[T](bytes: T*)(implicit num: Integral[T]): CompactByteString =
|
||||
ByteString.ByteStringCompact(bytes.map(x ⇒ num.toInt(x).toByte)(collection.breakOut))
|
||||
|
||||
/**
|
||||
* Creates a new CompactByteString by copying bytes from a ByteBuffer.
|
||||
*/
|
||||
def apply(bytes: ByteBuffer): CompactByteString = {
|
||||
val ar = new Array[Byte](bytes.remaining)
|
||||
bytes.get(ar)
|
||||
ByteString.ByteStringCompact(ar)
|
||||
}
|
||||
|
||||
/**
|
||||
* Creates a new CompactByteString by encoding a String as UTF-8.
|
||||
*/
|
||||
def apply(string: String): CompactByteString = apply(string, "UTF-8")
|
||||
|
||||
/**
|
||||
* Creates a new CompactByteString by encoding a String with a charset.
|
||||
*/
|
||||
def apply(string: String, charset: String): CompactByteString =
|
||||
ByteString.ByteStringCompact(string.getBytes(charset))
|
||||
|
||||
/**
|
||||
* Creates a new CompactByteString by copying length bytes starting at offset from
|
||||
* an Array.
|
||||
*/
|
||||
def fromArray(array: Array[Byte], offset: Int, length: Int): CompactByteString = {
|
||||
val copyOffset = math.max(offset, 0)
|
||||
val copyLength = math.max(math.min(array.length - copyOffset, length), 0)
|
||||
if (copyLength == 0) empty
|
||||
else {
|
||||
val copyArray = new Array[Byte](copyLength)
|
||||
Array.copy(array, copyOffset, copyArray, 0, copyLength)
|
||||
ByteString.ByteStringCompact(copyArray)
|
||||
}
|
||||
}
|
||||
|
||||
val empty: CompactByteString = ByteString.ByteStringCompact(Array.empty[Byte])
|
||||
}
|
||||
|
||||
/**
|
||||
* A compact, unfragmented ByteString.
|
||||
*/
|
||||
sealed abstract class CompactByteString extends ByteString with Serializable
|
||||
|
||||
/**
|
||||
* A mutable builder for efficiently creating a [[akka.util.ByteString]].
|
||||
*
|
||||
* The created ByteString is not automatically compacted.
|
||||
*/
|
||||
final class ByteStringBuilder extends Builder[Byte, ByteString] {
|
||||
import ByteString.{ ByteString1, ByteStrings }
|
||||
import ByteString.{ ByteStringCompact, ByteString1, ByteStrings }
|
||||
private var _length = 0
|
||||
private val _builder = new VectorBuilder[ByteString1]()
|
||||
private var _temp: Array[Byte] = _
|
||||
|
|
@ -370,6 +460,10 @@ final class ByteStringBuilder extends Builder[Byte, ByteString] {
|
|||
|
||||
override def ++=(xs: TraversableOnce[Byte]): this.type = {
|
||||
xs match {
|
||||
case b: ByteStringCompact ⇒
|
||||
clearTemp()
|
||||
_builder += b.toByteString1
|
||||
_length += b.length
|
||||
case b: ByteString1 ⇒
|
||||
clearTemp()
|
||||
_builder += b
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue