forked from apache/pulsar
-
Notifications
You must be signed in to change notification settings - Fork 1
/
ManagedLedgerImplUtils.java
82 lines (77 loc) · 3.7 KB
/
ManagedLedgerImplUtils.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
/*
* 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.util;
import java.util.concurrent.CompletableFuture;
import java.util.function.Predicate;
import org.apache.bookkeeper.mledger.AsyncCallbacks;
import org.apache.bookkeeper.mledger.Entry;
import org.apache.bookkeeper.mledger.ManagedLedgerException;
import org.apache.bookkeeper.mledger.Position;
import org.apache.bookkeeper.mledger.impl.ManagedLedgerImpl;
import org.apache.bookkeeper.mledger.impl.PositionImpl;
import org.apache.pulsar.common.classification.InterfaceStability;
@InterfaceStability.Evolving
public class ManagedLedgerImplUtils {
/**
* Reverse find last valid position one-entry by one-entry.
*/
public static CompletableFuture<Position> asyncGetLastValidPosition(final ManagedLedgerImpl ledger,
final Predicate<Entry> predicate,
final PositionImpl startPosition) {
CompletableFuture<Position> future = new CompletableFuture<>();
if (!ledger.isValidPosition(startPosition)) {
future.complete(startPosition);
} else {
internalAsyncReverseFindPositionOneByOne(ledger, predicate, startPosition, future);
}
return future;
}
private static void internalAsyncReverseFindPositionOneByOne(final ManagedLedgerImpl ledger,
final Predicate<Entry> predicate,
final PositionImpl position,
final CompletableFuture<Position> future) {
ledger.asyncReadEntry(position, new AsyncCallbacks.ReadEntryCallback() {
@Override
public void readEntryComplete(Entry entry, Object ctx) {
final Position position = entry.getPosition();
try {
if (predicate.test(entry)) {
future.complete(position);
return;
}
PositionImpl previousPosition = ledger.getPreviousPosition((PositionImpl) position);
if (!ledger.isValidPosition(previousPosition)) {
future.complete(previousPosition);
} else {
internalAsyncReverseFindPositionOneByOne(ledger, predicate,
ledger.getPreviousPosition((PositionImpl) position), future);
}
} catch (Exception e) {
future.completeExceptionally(e);
} finally {
entry.release();
}
}
@Override
public void readEntryFailed(ManagedLedgerException exception, Object ctx) {
future.completeExceptionally(exception);
}
}, null);
}
}