/**
* Copyright 2016 Yahoo Inc.
*
* Licensed 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 com.yahoo.pulsar.broker.service.persistent;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
import org.apache.bookkeeper.mledger.AsyncCallbacks.FindEntryCallback;
import org.apache.bookkeeper.mledger.AsyncCallbacks.MarkDeleteCallback;
import org.apache.bookkeeper.mledger.ManagedCursor;
import org.apache.bookkeeper.mledger.ManagedLedgerException;
import org.apache.bookkeeper.mledger.Position;
import org.apache.bookkeeper.mledger.util.Rate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.yahoo.pulsar.client.impl.MessageImpl;
/**
*/
public class PersistentMessageExpiryMonitor implements FindEntryCallback {
private final ManagedCursor cursor;
private final String subName;
private final String topicName;
private final Rate msgExpired;
private static final int FALSE = 0;
private static final int TRUE = 1;
@SuppressWarnings("unused")
private volatile int expirationCheckInProgress = FALSE;
private static final AtomicIntegerFieldUpdater<PersistentMessageExpiryMonitor> expirationCheckInProgressUpdater = AtomicIntegerFieldUpdater
.newUpdater(PersistentMessageExpiryMonitor.class, "expirationCheckInProgress");
public PersistentMessageExpiryMonitor(String topicName, String subscriptionName, ManagedCursor cursor) {
this.topicName = topicName;
this.cursor = cursor;
this.subName = subscriptionName;
this.msgExpired = new Rate();
}
public void expireMessages(int messageTTLInSeconds) {
if (expirationCheckInProgressUpdater.compareAndSet(this, FALSE, TRUE)) {
log.info("[{}][{}] Starting message expiry check, ttl= {} seconds", topicName, subName,
messageTTLInSeconds);
cursor.asyncFindNewestMatching(ManagedCursor.FindPositionConstraint.SearchActiveEntries, entry -> {
MessageImpl msg = null;
try {
msg = MessageImpl.deserialize(entry.getDataBuffer());
return msg.isExpired(messageTTLInSeconds);
} catch (Exception e) {
log.error("[{}][{}] Error deserializing message for expiry check", topicName, subName, e);
} finally {
entry.release();
if (msg != null) {
msg.recycle();
}
}
return false;
}, this, null);
} else {
if (log.isDebugEnabled()) {
log.debug("[{}][{}] Ignore expire-message scheduled task, last check is still running", topicName,
subName);
}
}
}
public void updateRates() {
msgExpired.calculateRate();
}
public double getMessageExpiryRate() {
return msgExpired.getRate();
}
private static final Logger log = LoggerFactory.getLogger(PersistentMessageExpiryMonitor.class);
private final MarkDeleteCallback markDeleteCallback = new MarkDeleteCallback() {
@Override
public void markDeleteComplete(Object ctx) {
long numMessagesExpired = (long) ctx - cursor.getNumberOfEntriesInBacklog();
msgExpired.recordMultipleEvents(numMessagesExpired, 0 /* no value stats */);
updateRates();
if (log.isDebugEnabled()) {
log.debug("[{}][{}] Mark deleted {} messages", topicName, subName, numMessagesExpired);
}
}
@Override
public void markDeleteFailed(ManagedLedgerException exception, Object ctx) {
log.warn("[{}][{}] Message expiry failed - mark delete failed", topicName, subName, exception);
updateRates();
}
};
@Override
public void findEntryComplete(Position position, Object ctx) {
if (position != null) {
log.info("[{}][{}] Expiring all messages until position {}", topicName, subName, position);
cursor.asyncMarkDelete(position, markDeleteCallback, cursor.getNumberOfEntriesInBacklog());
} else {
if (log.isDebugEnabled()) {
log.debug("[{}][{}] No messages to expire", topicName, subName);
}
updateRates();
}
expirationCheckInProgress = FALSE;
}
@Override
public void findEntryFailed(ManagedLedgerException exception, Object ctx) {
if (log.isDebugEnabled()) {
log.debug("[{}][{}] Finding expired entry operation failed", topicName, subName, exception);
}
expirationCheckInProgress = FALSE;
updateRates();
}
}