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HttpConversionUtils avoid intermediate collection allocation

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Modifications:
HttpConversionUtil#toLowercaseMap requires an intermediate List to be allocated. This can be avoided with the recently added value iterator methods.

Modifications:
- Use HttpHeaders#valueCharSequenceIterator instead of getAll

Result:
Less intermediate object allocation and copying.
This commit is contained in:
Scott Mitchell 2017-11-20 09:16:42 -08:00
parent 907ed79069
commit a3e41ba6eb
1 changed files with 9 additions and 9 deletions
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18
codec-http2/src/main/java/io/netty/handler/codec/http2/HttpConversionUtil.java
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@ -38,7 +38,6 @@ import io.netty.util.internal.UnstableApi;
import java.net.URI;
import java.util.Iterator;
import java.util.List;
import java.util.Map.Entry;
import static io.netty.handler.codec.http.HttpScheme.HTTP;
@ -413,14 +412,13 @@ public final class HttpConversionUtil {
return out;
}
private static CharSequenceMap<AsciiString> toLowercaseMap(List<String> values) {
private static CharSequenceMap<AsciiString> toLowercaseMap(Iterator<? extends CharSequence> valuesIter,
int arraySizeHint) {
UnsupportedValueConverter<AsciiString> valueConverter = UnsupportedValueConverter.<AsciiString>instance();
CharSequenceMap<AsciiString> result =
new CharSequenceMap<AsciiString>(true, valueConverter, values.size());
CharSequenceMap<AsciiString> result = new CharSequenceMap<AsciiString>(true, valueConverter, arraySizeHint);
// we iterate because the underlying list is probably a linked list
for (CharSequence value : values) {
AsciiString lowerCased = AsciiString.of(value).toLowerCase();
while (valuesIter.hasNext()) {
AsciiString lowerCased = AsciiString.of(valuesIter.next()).toLowerCase();
try {
int index = lowerCased.forEachByte(FIND_COMMA);
if (index != -1) {
@ -429,7 +427,7 @@ public final class HttpConversionUtil {
result.add(lowerCased.subSequence(start, index, false).trim(), EMPTY_STRING);
start = index + 1;
} while (start < lowerCased.length() &&
(index = lowerCased.forEachByte(start, value.length() - start, FIND_COMMA)) != -1);
(index = lowerCased.forEachByte(start, lowerCased.length() - start, FIND_COMMA)) != -1);
result.add(lowerCased.subSequence(start, lowerCased.length(), false).trim(), EMPTY_STRING);
} else {
result.add(lowerCased.trim(), EMPTY_STRING);
@ -445,8 +443,10 @@ public final class HttpConversionUtil {
public static void toHttp2Headers(HttpHeaders inHeaders, Http2Headers out) {
Iterator<Entry<CharSequence, CharSequence>> iter = inHeaders.iteratorCharSequence();
// Choose 8 as a default size because it is unlikely we will see more than 4 Connection headers values, but
// still allowing for "enough" space in the map to reduce the chance of hash code collision.
CharSequenceMap<AsciiString> connectionBlacklist =
toLowercaseMap(inHeaders.getAll(HttpHeaderNames.CONNECTION));
toLowercaseMap(inHeaders.valueCharSequenceIterator(HttpHeaderNames.CONNECTION), 8);
while (iter.hasNext()) {
Entry<CharSequence, CharSequence> entry = iter.next();
final AsciiString aName = AsciiString.of(entry.getKey()).toLowerCase();