[GitHub] [pulsar] eolivelli commented on a diff in pull request #16545: Issue 7623: Add API to analyse a subscription backlog and provide a accurate value

[GitBox <gi...@apache.org>]

eolivelli commented on code in PR #16545:
URL: https://github.com/apache/pulsar/pull/16545#discussion_r920825043


##########
managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/OpScan.java:
##########
@@ -0,0 +1,124 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.bookkeeper.mledger.impl;
+
+import com.google.common.base.Predicate;
+import java.util.List;
+import java.util.Optional;
+import java.util.concurrent.atomic.AtomicLong;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.bookkeeper.mledger.AsyncCallbacks.ReadEntryCallback;
+import org.apache.bookkeeper.mledger.AsyncCallbacks.ScanCallback;
+import org.apache.bookkeeper.mledger.Entry;
+import org.apache.bookkeeper.mledger.ManagedLedgerException;
+import org.apache.bookkeeper.mledger.Position;
+import org.apache.bookkeeper.mledger.ScanOutcome;
+import org.apache.bookkeeper.mledger.impl.ManagedLedgerImpl.PositionBound;
+
+@Slf4j
+class OpScan implements ReadEntryCallback {
+    private final ManagedCursorImpl cursor;
+    private final ManagedLedgerImpl ledger;
+    private final PositionImpl startPosition;
+    private final ScanCallback callback;
+    private final Predicate<Entry> condition;
+    private final Object ctx;
+    private final AtomicLong remainingEntries = new AtomicLong();
+    private final long timeOutMs;
+    private final long startTime = System.currentTimeMillis();
+
+    PositionImpl searchPosition;
+    Position lastMatchedPosition = null;
+
+    public OpScan(ManagedCursorImpl cursor, PositionImpl startPosition, Predicate<Entry> condition,
+                  ScanCallback callback, Object ctx, long maxEntries, long timeOutMs) {
+        this.cursor = cursor;
+        this.ledger = cursor.ledger;
+        this.startPosition = startPosition;
+        this.callback = callback;
+        this.condition = condition;
+        this.ctx = ctx;
+        this.searchPosition = startPosition;
+        this.remainingEntries.set(maxEntries);
+        this.timeOutMs = timeOutMs;
+    }
+
+
+    @Override
+    public void readEntryComplete(Entry entry, Object ctx) {
+        remainingEntries.decrementAndGet();
+        final Position position = entry.getPosition();
+        lastMatchedPosition = position;
+        // filter out the entry if it has been already deleted
+        // filterReadEntries will call entry.release if the entry is filtered out
+        List<Entry> entries = this.cursor.filterReadEntries(List.of(entry));
+        if (!entries.isEmpty()) {
+            boolean exit = false;
+            try {
+                if (!condition.apply(entry)) {
+                  exit = true;
+                }
+                entry.release();
+            } catch (Throwable err) {
+                log.error("[{}] user exception", cursor, err);

Review Comment:
   I am not calling it because we know nothing about the status of the entry at this point



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