| /* |
| * 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 java.util.List; |
| import java.util.Objects; |
| import java.util.Optional; |
| import java.util.concurrent.atomic.AtomicLong; |
| import java.util.function.Predicate; |
| import lombok.extern.slf4j.Slf4j; |
| import org.apache.bookkeeper.mledger.AsyncCallbacks.ReadEntriesCallback; |
| 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 ReadEntriesCallback { |
| private final ManagedCursorImpl cursor; |
| private final ManagedLedgerImpl ledger; |
| 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(); |
| private final int batchSize; |
| |
| PositionImpl searchPosition; |
| Position lastSeenPosition = null; |
| |
| public OpScan(ManagedCursorImpl cursor, int batchSize, |
| PositionImpl startPosition, Predicate<Entry> condition, |
| ScanCallback callback, Object ctx, long maxEntries, long timeOutMs) { |
| this.batchSize = batchSize; |
| if (batchSize <= 0) { |
| throw new IllegalArgumentException("batchSize " + batchSize); |
| } |
| this.cursor = Objects.requireNonNull(cursor); |
| this.ledger = cursor.ledger; |
| this.callback = callback; |
| this.condition = condition; |
| this.ctx = ctx; |
| this.searchPosition = startPosition; |
| this.remainingEntries.set(maxEntries); |
| this.timeOutMs = timeOutMs; |
| } |
| |
| @Override |
| public void readEntriesComplete(List<Entry> entries, Object ctx) { |
| try { |
| Position lastPositionForBatch = entries.get(entries.size() - 1).getPosition(); |
| lastSeenPosition = lastPositionForBatch; |
| // filter out the entry if it has been already deleted |
| // filterReadEntries will call entry.release if the entry is filtered out |
| List<Entry> entriesFiltered = this.cursor.filterReadEntries(entries); |
| int skippedEntries = entries.size() - entriesFiltered.size(); |
| remainingEntries.addAndGet(-skippedEntries); |
| if (!entriesFiltered.isEmpty()) { |
| for (Entry entry : entriesFiltered) { |
| if (remainingEntries.decrementAndGet() <= 0) { |
| log.warn("[{}] Scan abort after reading too many entries", OpScan.this.cursor); |
| callback.scanComplete(lastSeenPosition, ScanOutcome.ABORTED, OpScan.this.ctx); |
| return; |
| } |
| if (!condition.test(entry)) { |
| log.warn("[{}] Scan abort due to user code", OpScan.this.cursor); |
| callback.scanComplete(lastSeenPosition, ScanOutcome.USER_INTERRUPTED, OpScan.this.ctx); |
| return; |
| } |
| } |
| } |
| searchPosition = ledger.getPositionAfterN((PositionImpl) lastPositionForBatch, 1, |
| PositionBound.startExcluded); |
| if (log.isDebugEnabled()) { |
| log.debug("readEntryComplete {} at {} next is {}", lastPositionForBatch, searchPosition); |
| } |
| |
| if (searchPosition.compareTo((PositionImpl) lastPositionForBatch) == 0) { |
| // we have reached the end of the ledger, as we are not doing progress |
| callback.scanComplete(lastSeenPosition, ScanOutcome.COMPLETED, OpScan.this.ctx); |
| return; |
| } |
| } catch (Throwable t) { |
| log.error("Unhandled error", t); |
| callback.scanFailed(ManagedLedgerException.getManagedLedgerException(t), |
| Optional.ofNullable(lastSeenPosition), OpScan.this.ctx); |
| return; |
| } finally { |
| entries.forEach(Entry::release); |
| } |
| find(); |
| } |
| |
| @Override |
| public void readEntriesFailed(ManagedLedgerException exception, Object ctx) { |
| callback.scanFailed(exception, Optional.ofNullable(searchPosition), OpScan.this.ctx); |
| } |
| |
| public void find() { |
| if (remainingEntries.get() <= 0) { |
| log.warn("[{}] Scan abort after reading too many entries", OpScan.this.cursor); |
| callback.scanComplete(lastSeenPosition, ScanOutcome.ABORTED, OpScan.this.ctx); |
| return; |
| } |
| if (System.currentTimeMillis() - startTime > timeOutMs) { |
| log.warn("[{}] Scan abort after hitting the deadline", OpScan.this.cursor); |
| callback.scanComplete(lastSeenPosition, ScanOutcome.ABORTED, OpScan.this.ctx); |
| return; |
| } |
| if (cursor.hasMoreEntries(searchPosition)) { |
| OpReadEntry opReadEntry = OpReadEntry.create(cursor, searchPosition, batchSize, |
| this, OpScan.this.ctx, null, null); |
| ledger.asyncReadEntries(opReadEntry); |
| } else { |
| callback.scanComplete(lastSeenPosition, ScanOutcome.COMPLETED, OpScan.this.ctx); |
| } |
| } |
| } |