Github user mbaechler commented on a diff in the pull request:
https://github.com/apache/james-project/pull/13#discussion_r43605874
--- Diff:
mailbox/tool/src/main/java/org/apache/james/mailbox/indexer/ReIndexerImpl.java
---
@@ -0,0 +1,138 @@
+/****************************************************************
+ * 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.james.mailbox.indexer;
+
+import org.apache.james.mailbox.MailboxManager;
+import org.apache.james.mailbox.MailboxSession;
+import org.apache.james.mailbox.exception.MailboxException;
+import org.apache.james.mailbox.indexer.events.FlagsMessageEvent;
+import org.apache.james.mailbox.indexer.events.ImpactingEventType;
+import org.apache.james.mailbox.indexer.events.ImpactingMessageEvent;
+import org.apache.james.mailbox.indexer.registrations.GlobalRegistration;
+import org.apache.james.mailbox.indexer.registrations.MailboxRegistration;
+import org.apache.james.mailbox.model.MailboxPath;
+import org.apache.james.mailbox.model.MessageRange;
+import org.apache.james.mailbox.store.MailboxSessionMapperFactory;
+import org.apache.james.mailbox.store.mail.MessageMapper;
+import org.apache.james.mailbox.store.mail.model.Mailbox;
+import org.apache.james.mailbox.store.mail.model.MailboxId;
+import org.apache.james.mailbox.store.mail.model.Message;
+import org.apache.james.mailbox.store.search.ListeningMessageSearchIndex;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.List;
+
+/**
+ * Note about live re-indexation handling :
+ *
+ * - Data races may arise... If you modify the stored value between the
received event check and the index operation,
+ * you have an inconsistent behavior.
+ *
+ * This class is more about supporting changes in real time for future
indexed values. If you change a flags / delete
+ * mails for instance, you will see it in the indexed value !
+ *
+ * Why only care about updates and deletions ? Additions are already
handled by the indexer that behaves normaly. We
+ * should just "adapt" our indexed value to the latest value, if any. The
normal indexer will take care of new stuff.
+ */
+public class ReIndexerImpl<Id extends MailboxId> implements ReIndexer {
+
+ private static final Logger LOGGER =
LoggerFactory.getLogger(ReIndexerImpl.class);
+ public static final int LIMIT = 0;
+
+ private final MailboxManager mailboxManager;
+ private final ListeningMessageSearchIndex<Id> messageSearchIndex;
+ private final MailboxSessionMapperFactory<Id>
mailboxSessionMapperFactory;
+
+ public ReIndexerImpl(MailboxManager mailboxManager,
+ ListeningMessageSearchIndex<Id>
messageSearchIndex,
+ MailboxSessionMapperFactory<Id>
mailboxSessionMapperFactory) {
+ this.mailboxManager = mailboxManager;
+ this.messageSearchIndex = messageSearchIndex;
+ this.mailboxSessionMapperFactory = mailboxSessionMapperFactory;
+ }
+
+ public void reIndex(MailboxPath path) throws MailboxException {
+ MailboxSession mailboxSession =
mailboxManager.createSystemSession("re-indexing", LOGGER);
+ reIndex(path, mailboxSession);
+ }
+
+
+ public synchronized void reIndex() throws MailboxException {
+ MailboxSession mailboxSession =
mailboxManager.createSystemSession("re-indexing", LOGGER);
+ List<MailboxPath> mailboxPaths =
mailboxManager.list(mailboxSession);
+ GlobalRegistration globalRegistration = new GlobalRegistration();
+ mailboxManager.addGlobalListener(globalRegistration,
mailboxSession);
+ for (MailboxPath mailboxPath : mailboxPaths) {
+ if (globalRegistration.indexThisPath(mailboxPath)) {
+ reIndex(mailboxPath, mailboxSession);
+ }
+ }
+ mailboxManager.removeGlobalListener(globalRegistration,
mailboxSession);
+ }
+
+ private void reIndex(MailboxPath path, MailboxSession mailboxSession)
throws MailboxException {
+ MailboxRegistration mailboxRegistration = new
MailboxRegistration(path);
+ mailboxManager.addListener(path, mailboxRegistration,
mailboxSession);
+ LOGGER.info("Intend to reindex " + path);
+ Mailbox<Id> mailbox =
mailboxSessionMapperFactory.getMailboxMapper(mailboxSession).findMailboxByPath(path);
+ messageSearchIndex.delete(mailboxSession, mailbox,
MessageRange.all());
+ handleIterations(mailboxSession,
+ mailboxRegistration,
+ mailbox,
+ mailboxSessionMapperFactory.getMessageMapper(mailboxSession)
+ .findInMailbox(mailbox,
+ MessageRange.all(),
+ MessageMapper.FetchType.Full,
+ LIMIT));
+ mailboxManager.removeListener(path, mailboxRegistration,
mailboxSession);
+ LOGGER.info("Finish to reindex " + path);
+ }
+
+ private void handleIterations(MailboxSession mailboxSession,
MailboxRegistration mailboxRegistration, Mailbox<Id> mailbox,
Iterator<Message<Id>> iterator) throws MailboxException {
+ while (iterator.hasNext()) {
+ Message<Id> message = iterator.next();
+ ImpactingMessageEvent impactingMessageEvent =
findMostRelevant(mailboxRegistration.getImpactingEvents(message.getUid()));
+ if (impactingMessageEvent == null) {
+ messageSearchIndex.add(mailboxSession, mailbox, message);
+ } else if (impactingMessageEvent instanceof FlagsMessageEvent)
{
+ message.setFlags(((FlagsMessageEvent)
impactingMessageEvent).getFlags());
+ messageSearchIndex.add(mailboxSession, mailbox, message);
+ }
+ }
+ }
+
+ private ImpactingMessageEvent
findMostRelevant(Collection<ImpactingMessageEvent> messageEvents) {
+ if (messageEvents == null) {
+ return null;
+ }
+ ImpactingMessageEvent last = null;
+ for (ImpactingMessageEvent impactingMessageEvent : messageEvents) {
+ if
(impactingMessageEvent.getType().equals(ImpactingEventType.Deletion)) {
+ return impactingMessageEvent;
+ }
+ last = impactingMessageEvent;
--- End diff --
if you get a list of messageEvents, you can just split your "find deletion"
loop from the getLast by using Iterables.getLast()
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