tabish121 commented on a change in pull request #2975: ARTEMIS-2617 Improve
AMQP Journal loading
URL: https://github.com/apache/activemq-artemis/pull/2975#discussion_r377320755
##########
File path:
artemis-protocols/artemis-amqp-protocol/src/main/java/org/apache/activemq/artemis/protocol/amqp/broker/AMQPMessage.java
##########
@@ -1183,8 +1219,126 @@ public Object getCorrelationID() {
return this;
}
+ /**
+ *
https://en.wikipedia.org/wiki/Knuth%E2%80%93Morris%E2%80%93Pratt_algorithm jump
table
+ */
+ private static int[] createJumpTable(byte[] needle) {
+ final int[] jumpTable = new int[needle.length + 1];
+ int j = 0;
+ for (int i = 1; i < needle.length; i++) {
+ while (j > 0 && needle[j] != needle[i]) {
+ j = jumpTable[j];
+ }
+ if (needle[j] == needle[i]) {
+ j++;
+ }
+ jumpTable[i + 1] = j;
+ }
+ for (int i = 1; i < jumpTable.length; i++) {
+ if (jumpTable[i] != 0) {
+ return jumpTable;
+ }
+ }
+ // optimization over the original algorithm: it would save from
accessing any jump table
+ return null;
+ }
+
+ /**
+ *
https://en.wikipedia.org/wiki/Knuth%E2%80%93Morris%E2%80%93Pratt_algorithm
search algorithm
+ */
+ private static int indexOf(ReadableBuffer haystack, int start, int end,
byte[] needle, int[] jumpTable) {
+ final long length = end - start;
+ int j = 0;
+ final int needleLength = needle.length;
+ for (int i = 0; i < length; i++) {
+ final int index = start + i;
+ final byte value = haystack.get(index);
+ while (j > 0 && needle[j] != value) {
+ j = jumpTable == null ? 0 : jumpTable[j];
+ }
+ if (needle[j] == value) {
+ j++;
+ }
+ if (j == needleLength) {
+ final int startMatch = index - needleLength + 1;
+ return startMatch;
+ }
+ }
+ return -1;
+ }
+
+ @Override
+ public boolean hasScheduledDeliveryTime() {
+ if (scheduledTime >= 0) {
+ return true;
+ }
+ return anyMessageAnnotations(SCHEDULED_DELIVERY_SYMBOLS,
+ SCHEDULED_DELIVERY_ENCODED,
+ SCHEDULED_DELIVERY_JUMP_TABLES);
+ }
+
+ private static boolean isValidSymbolEncoding(Symbol[] symbols, byte[][]
encodedSymbols) {
+ for (int i = 0, size = symbols.length; i < size; i++) {
+ final Symbol symbol = symbols[i];
+ final byte[] encoded = encodedSymbols[i];
+ if
(!Arrays.equals(symbol.toString().getBytes(StandardCharsets.US_ASCII),
encoded)) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ private boolean anyMessageAnnotations(Symbol[] symbols, byte[][]
encodedSymbols, int[][] jumpTables) {
+ assert isValidSymbolEncoding(symbols, encodedSymbols);
+ final int count = symbols.length;
+ if (messageDataScanned == SCANNED) {
+ final MessageAnnotations messageAnnotations = this.messageAnnotations;
+ if (messageAnnotations == null) {
+ return false;
+ }
+ Map<Symbol, Object> map = messageAnnotations.getValue();
+ if (map == null) {
+ return false;
+ }
+ for (int i = 0; i < count; i++) {
+ if (map.containsKey(symbols[i])) {
+ return true;
+ }
+ }
+ return false;
+ }
+ // messageDataScanned != SCANNED;
+ final ReadableBuffer data = this.data;
+ DecoderImpl decoder = TLSEncode.getDecoder();
+ final int position = data.position();
+ decoder.setBuffer(data.rewind());
+ try {
+ while (data.hasRemaining()) {
+ TypeConstructor<?> constructor = decoder.readConstructor();
+ if (MessageAnnotations.class.equals(constructor.getTypeClass())) {
Review comment:
As far as I recall the broker decodes the message annotations on each
message specifically to read the routing type and delivery time on receive.
I'm unsure for routing type if that is needed on reload from journal but
wouldn't be surprised if it doesn't get called at some point.
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