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Posted to notifications@pekko.apache.org by "He-Pin (via GitHub)" <gi...@apache.org> on 2025/09/20 07:35:18 UTC
[PR] feat: Support setting starting number of virtual thread. [pekko]
He-Pin opened a new pull request, #2242:
URL: https://github.com/apache/pekko/pull/2242
Motivation:
Refs: https://github.com/apache/pekko/issues/2170
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Re: [PR] feat: Support setting starting number of virtual thread. [pekko]
Posted by "pjfanning (via GitHub)" <gi...@apache.org>.
pjfanning commented on PR #2242:
URL: https://github.com/apache/pekko/pull/2242#issuecomment-3334866415
lgtm
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Re: [PR] feat: Support setting starting number of virtual thread. [pekko]
Posted by "He-Pin (via GitHub)" <gi...@apache.org>.
He-Pin merged PR #2242:
URL: https://github.com/apache/pekko/pull/2242
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Re: [PR] feat: Support setting starting number of virtual thread. [pekko]
Posted by "Copilot (via GitHub)" <gi...@apache.org>.
Copilot commented on code in PR #2242:
URL: https://github.com/apache/pekko/pull/2242#discussion_r2366108695
##########
actor/src/main/resources/reference.conf:
##########
@@ -569,6 +577,10 @@ pekko {
#jdk.virtualThreadScheduler.minRunnable
#jdk.unparker.maxPoolSize
fallback = "fork-join-executor"
+
+ # When using virtual-thread-executor, you can set the starting naumber for virtual threads created by this dispatcher.
Review Comment:
The word 'naumber' is misspelled. It should be 'number'.
```suggestion
# When using virtual-thread-executor, you can set the starting number for virtual threads created by this dispatcher.
```
##########
actor/src/main/resources/reference.conf:
##########
@@ -555,6 +559,10 @@ pekko {
# --add-opens=java.base/jdk.internal.misc=ALL-UNNAMED
# --add-opens=java.base/java.lang=ALL-UNNAMED
virtualize = off
+
+ # When virtualize = on, you can set the starting naumber for virtual threads created by this dispatcher.
Review Comment:
The word 'naumber' is misspelled. It should be 'number'.
##########
actor/src/main/scala/org/apache/pekko/dispatch/VirtualThreadSupport.scala:
##########
@@ -57,53 +57,57 @@ private[dispatch] object VirtualThreadSupport {
/**
* Create a virtual thread factory with the default Virtual Thread executor.
+ * @param prefix the prefix of the virtual thread name.
+ * @param start the starting number of the virtual thread name, if -1, the number will not be appended.
*/
- def newVirtualThreadFactory(prefix: String): ThreadFactory = {
- require(isSupported, "Virtual thread is not supported.")
- try {
- val builderClass = ClassLoader.getSystemClassLoader.loadClass("java.lang.Thread$Builder")
- val ofVirtualClass = ClassLoader.getSystemClassLoader.loadClass("java.lang.Thread$Builder$OfVirtual")
- val ofVirtualMethod = lookup.findStatic(classOf[Thread], "ofVirtual", MethodType.methodType(ofVirtualClass))
- var builder = ofVirtualMethod.invoke()
- val nameMethod = lookup.findVirtual(ofVirtualClass, "name",
- MethodType.methodType(ofVirtualClass, classOf[String], classOf[Long]))
- // TODO support replace scheduler when we drop Java 8 support
- val factoryMethod = lookup.findVirtual(builderClass, "factory", MethodType.methodType(classOf[ThreadFactory]))
- builder = nameMethod.invoke(builder, prefix + "-virtual-thread-", zero)
- factoryMethod.invoke(builder).asInstanceOf[ThreadFactory]
- } catch {
- case NonFatal(e) =>
- // --add-opens java.base/java.lang=ALL-UNNAMED
- throw new UnsupportedOperationException("Failed to create virtual thread factory", e)
- }
+ def newVirtualThreadFactory(prefix: String, start: Int): ThreadFactory = {
+ newVirtualThreadFactory(prefix, start, null)
}
/**
- * Create a virtual thread factory with the specified executor as the scheduler of virtual thread.
+ * Create a virtual thread factory with the default Virtual Thread executor.
+ * @param prefix the prefix of the virtual thread name.
+ * @param start the starting number of the virtual thread name, if -1, the number will not be appended.
+ * @param executor the executor to be used as the scheduler of virtual thread. If null, the default scheduler will be used.
*/
- def newVirtualThreadFactory(prefix: String, executor: ExecutorService): ThreadFactory =
+ def newVirtualThreadFactory(prefix: String, start: Int, executor: ExecutorService): ThreadFactory = {
+ require(isSupported, "Virtual thread is not supported.")
+ require(prefix != null && prefix.nonEmpty, "prefix should not be null or empty.")
try {
val builderClass = ClassLoader.getSystemClassLoader.loadClass("java.lang.Thread$Builder")
val ofVirtualClass = ClassLoader.getSystemClassLoader.loadClass("java.lang.Thread$Builder$OfVirtual")
- val ofVirtualMethod = classOf[Thread].getDeclaredMethod("ofVirtual")
- var builder = ofVirtualMethod.invoke(null)
+ val ofVirtualMethod = lookup.findStatic(classOf[Thread], "ofVirtual", MethodType.methodType(ofVirtualClass))
+ var builder = ofVirtualMethod.invoke()
+ // set the name
+ if (start <= -1) {
+ val nameMethod = lookup.findVirtual(ofVirtualClass, "name",
+ MethodType.methodType(ofVirtualClass, classOf[String]))
+ builder = nameMethod.invoke(builder, prefix + "-virtual-thread")
+ } else {
+ val nameMethod = lookup.findVirtual(ofVirtualClass, "name",
+ MethodType.methodType(ofVirtualClass, classOf[String], classOf[Long]))
+ builder = nameMethod.invoke(builder, prefix + "-virtual-thread-", zero)
Review Comment:
The `start` parameter is ignored when `start > -1`. The code should use the actual `start` value instead of hardcoded `zero`. It should be `java.lang.Long.valueOf(start.toLong)`.
```suggestion
builder = nameMethod.invoke(builder, prefix + "-virtual-thread-", java.lang.Long.valueOf(start.toLong))
```
##########
actor/src/main/scala/org/apache/pekko/dispatch/VirtualThreadSupport.scala:
##########
@@ -57,53 +57,57 @@ private[dispatch] object VirtualThreadSupport {
/**
* Create a virtual thread factory with the default Virtual Thread executor.
+ * @param prefix the prefix of the virtual thread name.
+ * @param start the starting number of the virtual thread name, if -1, the number will not be appended.
*/
- def newVirtualThreadFactory(prefix: String): ThreadFactory = {
- require(isSupported, "Virtual thread is not supported.")
- try {
- val builderClass = ClassLoader.getSystemClassLoader.loadClass("java.lang.Thread$Builder")
- val ofVirtualClass = ClassLoader.getSystemClassLoader.loadClass("java.lang.Thread$Builder$OfVirtual")
- val ofVirtualMethod = lookup.findStatic(classOf[Thread], "ofVirtual", MethodType.methodType(ofVirtualClass))
- var builder = ofVirtualMethod.invoke()
- val nameMethod = lookup.findVirtual(ofVirtualClass, "name",
- MethodType.methodType(ofVirtualClass, classOf[String], classOf[Long]))
- // TODO support replace scheduler when we drop Java 8 support
- val factoryMethod = lookup.findVirtual(builderClass, "factory", MethodType.methodType(classOf[ThreadFactory]))
- builder = nameMethod.invoke(builder, prefix + "-virtual-thread-", zero)
- factoryMethod.invoke(builder).asInstanceOf[ThreadFactory]
- } catch {
- case NonFatal(e) =>
- // --add-opens java.base/java.lang=ALL-UNNAMED
- throw new UnsupportedOperationException("Failed to create virtual thread factory", e)
- }
+ def newVirtualThreadFactory(prefix: String, start: Int): ThreadFactory = {
+ newVirtualThreadFactory(prefix, start, null)
}
/**
- * Create a virtual thread factory with the specified executor as the scheduler of virtual thread.
+ * Create a virtual thread factory with the default Virtual Thread executor.
+ * @param prefix the prefix of the virtual thread name.
+ * @param start the starting number of the virtual thread name, if -1, the number will not be appended.
+ * @param executor the executor to be used as the scheduler of virtual thread. If null, the default scheduler will be used.
*/
- def newVirtualThreadFactory(prefix: String, executor: ExecutorService): ThreadFactory =
+ def newVirtualThreadFactory(prefix: String, start: Int, executor: ExecutorService): ThreadFactory = {
+ require(isSupported, "Virtual thread is not supported.")
+ require(prefix != null && prefix.nonEmpty, "prefix should not be null or empty.")
try {
val builderClass = ClassLoader.getSystemClassLoader.loadClass("java.lang.Thread$Builder")
val ofVirtualClass = ClassLoader.getSystemClassLoader.loadClass("java.lang.Thread$Builder$OfVirtual")
- val ofVirtualMethod = classOf[Thread].getDeclaredMethod("ofVirtual")
- var builder = ofVirtualMethod.invoke(null)
+ val ofVirtualMethod = lookup.findStatic(classOf[Thread], "ofVirtual", MethodType.methodType(ofVirtualClass))
+ var builder = ofVirtualMethod.invoke()
+ // set the name
+ if (start <= -1) {
Review Comment:
The condition `start <= -1` should be `start < 0` or `start == -1`. Using `<= -1` includes values like -2, -3, etc., which may not be intended behavior according to the documentation that specifically mentions -1.
```suggestion
if (start == -1) {
```
##########
actor/src/main/resources/reference.conf:
##########
@@ -623,6 +635,10 @@ pekko {
# --add-opens=java.base/jdk.internal.misc=ALL-UNNAMED
# --add-opens=java.base/java.lang=ALL-UNNAMED
virtualize = off
+
+ # When virtualize = on, you can set the starting naumber for virtual threads created by this dispatcher.
Review Comment:
The word 'naumber' is misspelled. It should be 'number'.
```suggestion
# When virtualize = on, you can set the starting number for virtual threads created by this dispatcher.
```
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Re: [PR] feat: Support setting starting number of virtual thread. [pekko]
Posted by "Copilot (via GitHub)" <gi...@apache.org>.
Copilot commented on code in PR #2242:
URL: https://github.com/apache/pekko/pull/2242#discussion_r2366576005
##########
actor/src/main/resources/reference.conf:
##########
@@ -492,6 +492,10 @@ pekko {
# --add-opens=java.base/jdk.internal.misc=ALL-UNNAMED
# --add-opens=java.base/java.lang=ALL-UNNAMED
virtualize = off
+
+ # When virtualize = on, you can set the starting id for virtual threads created by this dispatcher.
+ # -1 to turn off, 0 (default) to start from 0, or any positive number to start from that number.
+ virtual-thread-start-number = -1
Review Comment:
The default value is set to -1 (no numbering) in the configuration, but the documentation in the code comments suggests 0 is the default. This inconsistency should be resolved to avoid confusion.
```suggestion
virtual-thread-start-number = 0
```
##########
actor/src/main/resources/reference.conf:
##########
@@ -569,6 +577,10 @@ pekko {
#jdk.virtualThreadScheduler.minRunnable
#jdk.unparker.maxPoolSize
fallback = "fork-join-executor"
+
+ # When using virtual-thread-executor, you can set the starting number for virtual threads created by this dispatcher.
+ # -1 to turn off, 0 (default) to start from 0, or any positive number to start from that number.
+ virtual-thread-start-number = -1
Review Comment:
The default value is set to -1 (no numbering) in the configuration, but the documentation in the code comments suggests 0 is the default. This inconsistency should be resolved to avoid confusion.
```suggestion
virtual-thread-start-number = 0
```
##########
actor/src/main/resources/reference.conf:
##########
@@ -623,6 +635,10 @@ pekko {
# --add-opens=java.base/jdk.internal.misc=ALL-UNNAMED
# --add-opens=java.base/java.lang=ALL-UNNAMED
virtualize = off
+
+ # When virtualize = on, you can set the starting number for virtual threads created by this dispatcher.
+ # -1 to turn off, 0 (default) to start from 0, or any positive number to start from that number.
Review Comment:
The default value is set to -1 (no numbering) in the configuration, but the documentation in the code comments suggests 0 is the default. This inconsistency should be resolved to avoid confusion.
```suggestion
# -1 (default) to turn off, 0 to start from 0, or any positive number to start from that number.
```
##########
actor/src/main/resources/reference.conf:
##########
@@ -555,6 +559,10 @@ pekko {
# --add-opens=java.base/jdk.internal.misc=ALL-UNNAMED
# --add-opens=java.base/java.lang=ALL-UNNAMED
virtualize = off
+
+ # When virtualize = on, you can set the starting number for virtual threads created by this dispatcher.
+ # -1 to turn off, 0 (default) to start from 0, or any positive number to start from that number.
+ virtual-thread-start-number = -1
Review Comment:
The default value is set to -1 (no numbering) in the configuration, but the documentation in the code comments suggests 0 is the default. This inconsistency should be resolved to avoid confusion.
```suggestion
virtual-thread-start-number = 0
```
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Re: [PR] feat: Support setting starting number of virtual thread. [pekko]
Posted by "He-Pin (via GitHub)" <gi...@apache.org>.
He-Pin commented on PR #2242:
URL: https://github.com/apache/pekko/pull/2242#issuecomment-3314875569
I will change the default value to -1.
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Re: [PR] feat: Support setting starting number of virtual thread. [pekko]
Posted by "He-Pin (via GitHub)" <gi...@apache.org>.
He-Pin commented on PR #2242:
URL: https://github.com/apache/pekko/pull/2242#issuecomment-3314985163
this one should be ready now
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Re: [PR] feat: Support setting starting number of virtual thread. [pekko]
Posted by "He-Pin (via GitHub)" <gi...@apache.org>.
He-Pin commented on PR #2242:
URL: https://github.com/apache/pekko/pull/2242#issuecomment-3324186047
Yes, but not sure why Java makes the api like that, but a number is more flexible.
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Re: [PR] feat: Support setting starting number of virtual thread. [pekko]
Posted by "He-Pin (via GitHub)" <gi...@apache.org>.
He-Pin commented on PR #2242:
URL: https://github.com/apache/pekko/pull/2242#issuecomment-3334810904
@pjfanning so any further feedback on this pr？
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Re: [PR] feat: Support setting starting number of virtual thread. [pekko]
Posted by "He-Pin (via GitHub)" <gi...@apache.org>.
He-Pin commented on PR #2242:
URL: https://github.com/apache/pekko/pull/2242#issuecomment-3333476078
@pjfanning would you like to unblock this:)
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Re: [PR] feat: Support setting starting number of virtual thread. [pekko]
Posted by "He-Pin (via GitHub)" <gi...@apache.org>.
He-Pin commented on PR #2242:
URL: https://github.com/apache/pekko/pull/2242#issuecomment-3323752626
@pjfanning Would you like to take a look at this?
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Re: [PR] feat: Support setting starting number of virtual thread. [pekko]
Posted by "mdedetrich (via GitHub)" <gi...@apache.org>.
mdedetrich commented on code in PR #2242:
URL: https://github.com/apache/pekko/pull/2242#discussion_r2365572969
##########
actor/src/main/resources/reference.conf:
##########
@@ -555,6 +559,10 @@ pekko {
# --add-opens=java.base/jdk.internal.misc=ALL-UNNAMED
# --add-opens=java.base/java.lang=ALL-UNNAMED
virtualize = off
+
+ # When virtualize = on, you can set the starting naumber for virtual threads created by this dispatcher.
Review Comment:
Typo here
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Re: [PR] feat: Support setting starting number of virtual thread. [pekko]
Posted by "mdedetrich (via GitHub)" <gi...@apache.org>.
mdedetrich commented on PR #2242:
URL: https://github.com/apache/pekko/pull/2242#issuecomment-3324146449
> @mdedetrich because the underlying api `start` is a `long`
I know, its just that I can't see any situation why you would want to configure it to any value that isn't `-1` (disabled) or `0`. Why would you want to count from 1, 10, 100, 324234 etc etc?
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Re: [PR] feat: Support setting starting number of virtual thread. [pekko]
Posted by "He-Pin (via GitHub)" <gi...@apache.org>.
He-Pin commented on PR #2242:
URL: https://github.com/apache/pekko/pull/2242#issuecomment-3314738539
We may want to make the virtual thread total unnamed
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Re: [PR] feat: Support setting starting number of virtual thread. [pekko]
Posted by "He-Pin (via GitHub)" <gi...@apache.org>.
He-Pin commented on PR #2242:
URL: https://github.com/apache/pekko/pull/2242#issuecomment-3316682790
@pjfanning I have fixed the typo, it should be ready now.
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Re: [PR] feat: Support setting starting number of virtual thread. [pekko]
Posted by "He-Pin (via GitHub)" <gi...@apache.org>.
He-Pin commented on PR #2242:
URL: https://github.com/apache/pekko/pull/2242#issuecomment-3334871911
Thanks，make my day
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Re: [PR] feat: Support setting starting number of virtual thread. [pekko]
Posted by "He-Pin (via GitHub)" <gi...@apache.org>.
He-Pin commented on PR #2242:
URL: https://github.com/apache/pekko/pull/2242#issuecomment-3324139509
@mdedetrich because the underlying api `start` is a `long`
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