uschindler commented on a change in pull request #637: LUCENE-8754: Prevent
ConcurrentModificationException in SegmentInfo
URL: https://github.com/apache/lucene-solr/pull/637#discussion_r273345219
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File path: lucene/core/src/java/org/apache/lucene/index/SegmentInfo.java
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@@ -111,12 +112,12 @@ public SegmentInfo(Directory dir, Version version,
Version minVersion, String na
this.maxDoc = maxDoc;
this.isCompoundFile = isCompoundFile;
this.codec = codec;
- this.diagnostics = Objects.requireNonNull(diagnostics);
+ this.diagnostics = Collections.unmodifiableMap(new
HashMap<>(Objects.requireNonNull(diagnostics)));
this.id = id;
if (id.length != StringHelper.ID_LENGTH) {
throw new IllegalArgumentException("invalid id: " + Arrays.toString(id));
}
- this.attributes = Objects.requireNonNull(attributes);
+ this.attributes = Collections.unmodifiableMap(new
HashMap<>(Objects.requireNonNull(attributes)));
Review comment:
One thing: once master is on Java 11, this should use:
https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html#copyOf(java.util.Map)
We may simplify more code doing that as Java 11 has now unmodifiable maps
using a static initializer like Guava once had with ImmutableMap. Same for
lists and sets.
On top, if the input is unmodifiable already it does not copy, so it is more
heap efficient.
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