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8330077: Allow max number of events to be buffered to be configurable to avoid OVERFLOW_EVENT

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Reviewed-by: bpb, alanb
This commit is contained in:
Fabian Meumertzheim 2024-05-06 17:01:11 +00:00 • committed by Brian Burkhalter
parent ae60d84500
commit a8b3f194e8
3 changed files with 160 additions and 4 deletions
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28
src/java.base/share/classes/sun/nio/fs/AbstractWatchKey.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2008, 2024, 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
@ -28,16 +28,38 @@ package sun.nio.fs;
import java.nio.file.*;
import java.util.*;
import jdk.internal.util.ArraysSupport;
import sun.security.action.GetPropertyAction;
/**
* Base implementation class for watch keys.
*/
abstract class AbstractWatchKey implements WatchKey {
private static final int DEFAULT_MAX_EVENT_LIST_SIZE = 512;
/**
* Maximum size of event list (in the future this may be tunable)
* Maximum size of event list before dropping events and signalling OVERFLOW
*/
static final int MAX_EVENT_LIST_SIZE = 512;
static final int MAX_EVENT_LIST_SIZE;
static {
String rawValue = GetPropertyAction.privilegedGetProperty(
"jdk.nio.file.WatchService.maxEventsPerPoll",
String.valueOf(DEFAULT_MAX_EVENT_LIST_SIZE));
int intValue;
try {
// Clamp to max array length to signal OVERFLOW and drop events
// before OOMing.
intValue = Math.clamp(
Long.decode(rawValue),
1,
ArraysSupport.SOFT_MAX_ARRAY_LENGTH);
} catch (NumberFormatException e) {
intValue = DEFAULT_MAX_EVENT_LIST_SIZE;
}
MAX_EVENT_LIST_SIZE = intValue;
}
/**
* Special event to signal overflow