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/*
* Copyright (C) 2009-2020 Lightbend Inc.
*/
package akka.actor
import java.lang.{ StringBuilder => JStringBuilder }
import java.net.MalformedURLException
import scala.annotation.{ switch, tailrec }
import scala.collection.immutable
import com.github.ghik.silencer.silent
import akka.japi.Util.immutableSeq
/**
* Java API
*/
object ActorPaths {
// static forwarders to `object ActorPath`, since `trait ActorPath`
// could not be changed to `abstract ActorPath` in a binary compatible way
/**
* Parse string as actor path; throws java.net.MalformedURLException if unable to do so.
*/
def fromString(s: String): ActorPath = ActorPath.fromString(s)
/**
* Validates the given actor path element and throws an [[InvalidActorNameException]] if invalid.
* See [[#isValidPathElement]] for a non-throwing version.
*
* @param element actor path element to be validated
*/
final def validatePathElement(element: String): Unit = ActorPath.validatePathElement(element)
/**
* Validates the given actor path element and throws an [[InvalidActorNameException]] if invalid.
* See [[#isValidPathElement]] for a non-throwing version.
*
* @param element actor path element to be validated
* @param fullPath optional fullPath element that may be included for better error messages; null if not given
*/
final def validatePathElement(element: String, fullPath: String): Unit =
ActorPath.validatePathElement(element, fullPath)
/**
* This method is used to validate a path element (Actor Name).
* Since Actors form a tree, it is addressable using an URL, therefore an Actor Name has to conform to:
* RFC-2396.
*
* User defined Actor names may not start from a `$` sign - these are reserved for system names.
*/
final def isValidPathElement(s: String): Boolean = ActorPath.isValidPathElement(s)
}
object ActorPath {
/**
* Parse string as actor path; throws java.net.MalformedURLException if unable to do so.
*/
def fromString(s: String): ActorPath = s match {
case ActorPathExtractor(address, elems) => RootActorPath(address) / elems
case _ => throw new MalformedURLException("cannot parse as ActorPath: " + s)
}
private final val ValidSymbols = """-_.*$+:@&=,!~';"""
private final val ValidPathCode = -1
private final val EmptyPathCode = -2
/**
* Validates the given actor path element and throws an [[InvalidActorNameException]] if invalid.
* See [[#isValidPathElement]] for a non-throwing version.
*
* @param element actor path element to be validated
*/
final def validatePathElement(element: String): Unit = validatePathElement(element, fullPath = null)
/**
* Validates the given actor path element and throws an [[InvalidActorNameException]] if invalid.
* See [[#isValidPathElement]] for a non-throwing version.
*
* @param element actor path element to be validated
* @param fullPath optional fullPath element that may be included for better error messages; null if not given
*/
final def validatePathElement(element: String, fullPath: String): Unit = {
def fullPathMsg = if (fullPath ne null) s""" (in path [$fullPath])""" else ""
(findInvalidPathElementCharPosition(element): @switch) match {
case ValidPathCode =>
// valid
case EmptyPathCode =>
throw InvalidActorNameException(s"Actor path element must not be empty $fullPathMsg")
case invalidAt =>
throw InvalidActorNameException(s"""Invalid actor path element [$element]$fullPathMsg, illegal character [${element(
invalidAt)}] at position: $invalidAt. """ +
"""Actor paths MUST: """ +
"""not start with `$`, """ +
s"""include only ASCII letters and can only contain these special characters: ${ActorPath.ValidSymbols}.""")
}
}
/**
* This method is used to validate a path element (Actor Name).
* Since Actors form a tree, it is addressable using an URL, therefore an Actor Name has to conform to:
* RFC-2396.
*
* User defined Actor names may not start from a `$` sign - these are reserved for system names.
*/
final def isValidPathElement(s: String): Boolean =
findInvalidPathElementCharPosition(s) == ValidPathCode
private final def findInvalidPathElementCharPosition(s: String): Int =
if (s.isEmpty) EmptyPathCode
else {
def isValidChar(c: Char): Boolean =
(c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || (ValidSymbols.indexOf(c) != -1)
def isHexChar(c: Char): Boolean =
(c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F') || (c >= '0' && c <= '9')
val len = s.length
def validate(pos: Int): Int =
if (pos < len)
s.charAt(pos) match {
case c if isValidChar(c) => validate(pos + 1)
case '%' if pos + 2 < len && isHexChar(s.charAt(pos + 1)) && isHexChar(s.charAt(pos + 2)) =>
validate(pos + 3)
case _ => pos
} else ValidPathCode
if (len > 0 && s.charAt(0) != '$') validate(0) else 0
}
private[akka] final val emptyActorPath: immutable.Iterable[String] = List("")
}
/**
* Actor path is a unique path to an actor that shows the creation path
* up through the actor tree to the root actor.
*
* ActorPath defines a natural ordering (so that ActorRefs can be put into
* collections with this requirement); this ordering is intended to be as fast
* as possible, which owing to the bottom-up recursive nature of ActorPath
* is sorted by path elements FROM RIGHT TO LEFT, where RootActorPath >
* ChildActorPath in case the number of elements is different.
*
* Two actor paths are compared equal when they have the same name and parent
* elements, including the root address information. That does not necessarily
* mean that they point to the same incarnation of the actor if the actor is
* re-created with the same path. In other words, in contrast to how actor
* references are compared the unique id of the actor is not taken into account
* when comparing actor paths.
*/
@silent("@SerialVersionUID has no effect on traits")
@silent("deprecated")
@SerialVersionUID(1L)
sealed trait ActorPath extends Comparable[ActorPath] with Serializable {
/**
* The Address under which this path can be reached; walks up the tree to
* the RootActorPath.
*/
def address: Address
/**
* The name of the actor that this path refers to.
*/
def name: String
/**
* The path for the parent actor.
*/
def parent: ActorPath
/**
* Create a new child actor path.
*/
def /(child: String): ActorPath
/**
* Java API: Create a new child actor path.
*/
def child(child: String): ActorPath = /(child)
/**
* Recursively create a descendant’s path by appending all child names.
*/
def /(child: Iterable[String]): ActorPath =
child.foldLeft(this)((path, elem) => if (elem.isEmpty) path else path / elem)
/**
* Java API: Recursively create a descendant’s path by appending all child names.
*/
def descendant(names: java.lang.Iterable[String]): ActorPath = /(immutableSeq(names))
/**
* Sequence of names for this path from root to this. Performance implication: has to allocate a list.
*/
def elements: immutable.Iterable[String]
/**
* Java API: Sequence of names for this path from root to this. Performance implication: has to allocate a list.
*/
def getElements: java.lang.Iterable[String] =
scala.collection.JavaConverters.asJavaIterableConverter(elements).asJava
/**
* Walk up the tree to obtain and return the RootActorPath.
*/
def root: RootActorPath
/**
* String representation of the path elements, excluding the address
* information. The elements are separated with "/" and starts with "/",
* e.g. "/user/a/b".
*/
def toStringWithoutAddress: String = elements.mkString("/", "/", "")
/**
* Generate String representation, replacing the Address in the RootActor
* Path with the given one unless this path’s address includes host and port
* information.
*/
def toStringWithAddress(address: Address): String
/**
* Generate full String representation including the
* uid for the actor cell instance as URI fragment.
* This representation should be used as serialized
* representation instead of `toString`.
*/
def toSerializationFormat: String
/**
* Generate full String representation including the uid for the actor cell
* instance as URI fragment, replacing the Address in the RootActor Path
* with the given one unless this path’s address includes host and port
* information. This representation should be used as serialized
* representation instead of `toStringWithAddress`.
*/
def toSerializationFormatWithAddress(address: Address): String
/**
* INTERNAL API
* Unique identifier of the actor. Used for distinguishing
* different incarnations of actors with same path (name elements).
*/
private[akka] def uid: Int
/**
* INTERNAL API
* Creates a new ActorPath with same elements but with the specified `uid`.
*/
private[akka] def withUid(uid: Int): ActorPath
}
/**
* Root of the hierarchy of ActorPaths. There is exactly root per ActorSystem
* and node (for remote-enabled or clustered systems).
*/
@SerialVersionUID(1L)
final case class RootActorPath(address: Address, name: String = "/") extends ActorPath {
require(
name.length == 1 || name.indexOf('/', 1) == -1,
("/ may only exist at the beginning of the root actors name, " +
"it is a path separator and is not legal in ActorPath names: [%s]").format(name))
require(name.indexOf('#') == -1, "# is a fragment separator and is not legal in ActorPath names: [%s]".format(name))
override def parent: ActorPath = this
override def root: RootActorPath = this
override def /(child: String): ActorPath = {
val (childName, uid) = ActorCell.splitNameAndUid(child)
new ChildActorPath(this, childName, uid)
}
override def elements: immutable.Iterable[String] = ActorPath.emptyActorPath
override val toString: String = address.toString + name
override val toSerializationFormat: String = toString
override def toStringWithAddress(addr: Address): String =
if (address.host.isDefined) address.toString + name
else addr.toString + name
override def toSerializationFormatWithAddress(addr: Address): String = toStringWithAddress(addr)
override def compareTo(other: ActorPath): Int = other match {
case r: RootActorPath =>
toString.compareTo(r.toString) // FIXME make this cheaper by comparing address and name in isolation
case _: ChildActorPath => 1
}
/**
* INTERNAL API
*/
private[akka] def uid: Int = ActorCell.undefinedUid
/**
* INTERNAL API
*/
override private[akka] def withUid(uid: Int): ActorPath =
if (uid == ActorCell.undefinedUid) this
else throw new IllegalStateException(s"RootActorPath must have undefinedUid, [$uid != ${ActorCell.undefinedUid}")
}
@SerialVersionUID(1L)
final class ChildActorPath private[akka] (val parent: ActorPath, val name: String, override private[akka] val uid: Int)
extends ActorPath {
if (name.indexOf('/') != -1)
throw new IllegalArgumentException("/ is a path separator and is not legal in ActorPath names: [%s]".format(name))
if (name.indexOf('#') != -1)
throw new IllegalArgumentException(
"# is a fragment separator and is not legal in ActorPath names: [%s]".format(name))
override def address: Address = root.address
override def /(child: String): ActorPath = {
val (childName, uid) = ActorCell.splitNameAndUid(child)
new ChildActorPath(this, childName, uid)
}
override def elements: immutable.Iterable[String] = {
@tailrec
def rec(p: ActorPath, acc: List[String]): immutable.Iterable[String] = p match {
case _: RootActorPath => acc
case _ => rec(p.parent, p.name :: acc)
}
rec(this, Nil)
}
override def root: RootActorPath = {
@tailrec
def rec(p: ActorPath): RootActorPath = p match {
case r: RootActorPath => r
case _ => rec(p.parent)
}
rec(this)
}
/**
* INTERNAL API
*/
override private[akka] def withUid(uid: Int): ActorPath =
if (uid == this.uid) this
else new ChildActorPath(parent, name, uid)
override def toString: String = {
val length = toStringLength
buildToString(new JStringBuilder(length), length, 0, _.toString).toString
}
override def toSerializationFormat: String = {
val length = toStringLength
val sb = buildToString(new JStringBuilder(length + 12), length, 0, _.toString)
appendUidFragment(sb).toString
}
private def toStringLength: Int = toStringOffset + name.length
private val toStringOffset: Int = parent match {
case r: RootActorPath => r.address.toString.length + r.name.length
case c: ChildActorPath => c.toStringLength + 1
}
override def toStringWithAddress(addr: Address): String = {
if (IgnoreActorRef.isIgnoreRefPath(this)) {
// we never change address for IgnoreActorRef
this.toString
} else {
val diff = addressStringLengthDiff(addr)
val length = toStringLength + diff
buildToString(new JStringBuilder(length), length, diff, _.toStringWithAddress(addr)).toString
}
}
override def toSerializationFormatWithAddress(addr: Address): String = {
if (IgnoreActorRef.isIgnoreRefPath(this)) {
// we never change address for IgnoreActorRef
this.toString
} else {
val diff = addressStringLengthDiff(addr)
val length = toStringLength + diff
val sb = buildToString(new JStringBuilder(length + 12), length, diff, _.toStringWithAddress(addr))
appendUidFragment(sb).toString
}
}
private def addressStringLengthDiff(address: Address): Int = {
val r = root
if (r.address.host.isDefined) 0
else address.toString.length - r.address.toString.length
}
/**
* Optimized toString construction. Used by `toString`, `toSerializationFormat`,
* and friends `WithAddress`
* @param sb builder that will be modified (and same instance is returned)
* @param length pre-calculated length of the to be constructed String, not
* necessarily same as sb.capacity because more things may be appended to the
* sb afterwards
* @param diff difference in offset for each child element, due to different address
* @param rootString function to construct the root element string
*/
private def buildToString(
sb: JStringBuilder,
length: Int,
diff: Int,
rootString: RootActorPath => String): JStringBuilder = {
@tailrec
def rec(p: ActorPath): JStringBuilder = p match {
case r: RootActorPath =>
val rootStr = rootString(r)
sb.replace(0, rootStr.length, rootStr)
case c: ChildActorPath =>
val start = c.toStringOffset + diff
val end = start + c.name.length
sb.replace(start, end, c.name)
if (c ne this)
sb.replace(end, end + 1, "/")
rec(c.parent)
}
sb.setLength(length)
rec(this)
}
private def appendUidFragment(sb: JStringBuilder): JStringBuilder = {
if (uid == ActorCell.undefinedUid) sb
else sb.append("#").append(uid)
}
override def equals(other: Any): Boolean = {
@tailrec
def rec(left: ActorPath, right: ActorPath): Boolean =
if (left eq right) true
else if (left.isInstanceOf[RootActorPath]) left.equals(right)
else if (right.isInstanceOf[RootActorPath]) right.equals(left)
else left.name == right.name && rec(left.parent, right.parent)
other match {
case p: ActorPath => rec(this, p)
case _ => false
}
}
// TODO RK investigate Phil’s hash from scala.collection.mutable.HashTable.improve
override def hashCode: Int = {
import akka.routing.MurmurHash._
@tailrec
def rec(p: ActorPath, h: Int, c: Int, k: Int): Int = p match {
case r: RootActorPath => extendHash(h, r.##, c, k)
case _ => rec(p.parent, extendHash(h, stringHash(name), c, k), nextMagicA(c), nextMagicB(k))
}
finalizeHash(rec(this, startHash(42), startMagicA, startMagicB))
}
override def compareTo(other: ActorPath): Int = {
@tailrec
def rec(left: ActorPath, right: ActorPath): Int =
if (left eq right) 0
else if (left.isInstanceOf[RootActorPath]) left.compareTo(right)
else if (right.isInstanceOf[RootActorPath]) -right.compareTo(left)
else {
val x = left.name.compareTo(right.name)
if (x == 0) rec(left.parent, right.parent)
else x
}
rec(this, other)
}
}
