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The following commit(s) were added to refs/heads/master by this push:
new 7775ab1ebf Optimize MimePath#validate by first querying the MimePath
cache before attempting to parse
new e623b46231 Merge pull request #3976 from
matthiasblaesing/mime_parser_performance
7775ab1ebf is described below
commit 7775ab1ebf2839b895c4300a4e8b8013a5225ca9
Author: Matthias Bläsing <mblaes...@doppel-helix.eu>
AuthorDate: Sat Apr 2 10:35:13 2022 +0200
Optimize MimePath#validate by first querying the MimePath cache before
attempting to parse
For the changes regarding the switch from a synchronized access to a
HashMap to a ConcurrentHashMap:
The existing synchronisation only protected the get and set operations
on the map and not some secondary functionality (iteration for example).
Using a ConcurrentHashMap should thus improve performance and not
change the semantics.
---
.../netbeans/api/editor/mimelookup/MimePath.java | 48 ++++++++++++----------
1 file changed, 26 insertions(+), 22 deletions(-)
diff --git
a/platform/editor.mimelookup/src/org/netbeans/api/editor/mimelookup/MimePath.java
b/platform/editor.mimelookup/src/org/netbeans/api/editor/mimelookup/MimePath.java
index 7a6b3cd487..50f9598006 100644
---
a/platform/editor.mimelookup/src/org/netbeans/api/editor/mimelookup/MimePath.java
+++
b/platform/editor.mimelookup/src/org/netbeans/api/editor/mimelookup/MimePath.java
@@ -29,12 +29,12 @@ import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
import java.util.regex.Pattern;
import org.netbeans.modules.editor.mimelookup.APIAccessor;
import org.netbeans.modules.editor.mimelookup.MimeLookupCacheSPI;
import org.netbeans.modules.editor.mimelookup.MimePathLookup;
import org.openide.util.Lookup;
-import org.openide.util.lookup.Lookups;
/**
* The mime path is a concatenation of one or more mime types. The purpose of
@@ -112,14 +112,14 @@ public final class MimePath {
private static final Object LOCK = new Object();
/** The List of Recently Used mime paths. */
- private static final ArrayList<MimePath> LRU = new ArrayList<MimePath>();
+ private static final ArrayList<MimePath> LRU = new ArrayList<>();
/** The maximum size of the List of Recently Used mime paths.
/* package */ static final int MAX_LRU_SIZE = 3;
private static final Pattern REG_NAME_PATTERN =
Pattern.compile("^[[\\p{Alnum}][!#$&.+\\-^_]]{1,127}$"); //NOI18N
- private static final Set<String> WELL_KNOWN_TYPES = new
HashSet<String>(Arrays.asList(
+ private static final Set<String> WELL_KNOWN_TYPES = new
HashSet<>(Arrays.asList(
"application", //NOI18N
"audio", //NOI18N
"content", //NOI18N for content/unknown mime type
@@ -131,7 +131,7 @@ public final class MimePath {
"video" //NOI18N
));
- private static final Map<String,Reference<MimePath>> string2mimePath = new
HashMap<String,Reference<MimePath>>();
+ private static final Map<String,Reference<MimePath>> string2mimePath = new
ConcurrentHashMap<>();
/**
* Gets the mime path for the given mime type. The returned
<code>MimePath</code>
@@ -199,14 +199,12 @@ public final class MimePath {
*/
public static MimePath parse(String path) {
assert path != null : "path cannot be null"; // NOI18N
-
- synchronized (string2mimePath) {
- Reference<MimePath> mpRef = string2mimePath.get(path);
- MimePath mimePath = mpRef != null ? mpRef.get() : null;
-
- if (mimePath != null) {
- return mimePath;
- }
+
+ Reference<MimePath> mpRef = string2mimePath.get(path);
+ MimePath mimePath = mpRef != null ? mpRef.get() : null;
+
+ if (mimePath != null) {
+ return mimePath;
}
// Parse the path
@@ -214,16 +212,14 @@ public final class MimePath {
if (!(o instanceof MimePath)) {
throw new IllegalArgumentException((String) o);
}
-
- synchronized (string2mimePath) {
- MimePath mimePath = (MimePath) o;
-
- // Intern the path since the language path's string path is also
interned
- // and thus they can be matched by identity
- string2mimePath.put(path.intern(), new
WeakReference<MimePath>(mimePath));
-
- return mimePath;
- }
+
+ mimePath = (MimePath) o;
+
+ // Intern the path since the language path's string path is also
interned
+ // and thus they can be matched by identity
+ string2mimePath.put(path.intern(), new WeakReference<>(mimePath));
+
+ return mimePath;
}
/**
@@ -278,6 +274,14 @@ public final class MimePath {
* @since 1.7
*/
public static boolean validate(CharSequence path) {
+ if(path == null) {
+ return false;
+ }
+
+ if (string2mimePath.containsKey(path.toString())) {
+ return true;
+ }
+
// parseImpl will return error string if parsing fails
return !(parseImpl(path, true) instanceof String);
}
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