com.google.gerrit.server.index.change.ReindexAfterUpdate.java Source code

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Here is the source code for com.google.gerrit.server.index.change.ReindexAfterUpdate.java

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// Copyright (C) 2014 The Android Open Source Project
//
// 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.google.gerrit.server.index.change;

import static com.google.gerrit.server.query.change.ChangeData.asChanges;

import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListeningExecutorService;
import com.google.gerrit.extensions.events.GitReferenceUpdatedListener;
import com.google.gerrit.reviewdb.client.Branch;
import com.google.gerrit.reviewdb.client.Change;
import com.google.gerrit.reviewdb.client.Project;
import com.google.gerrit.reviewdb.client.RefNames;
import com.google.gerrit.reviewdb.server.ReviewDb;
import com.google.gerrit.server.git.QueueProvider.QueueType;
import com.google.gerrit.server.index.IndexExecutor;
import com.google.gerrit.server.notedb.ChangeNotes;
import com.google.gerrit.server.project.NoSuchChangeException;
import com.google.gerrit.server.query.change.InternalChangeQuery;
import com.google.gerrit.server.util.ManualRequestContext;
import com.google.gerrit.server.util.OneOffRequestContext;
import com.google.gerrit.server.util.RequestContext;
import com.google.gwtorm.server.OrmException;
import com.google.inject.Inject;
import com.google.inject.Provider;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.List;
import java.util.concurrent.Callable;

public class ReindexAfterUpdate implements GitReferenceUpdatedListener {
    private static final Logger log = LoggerFactory.getLogger(ReindexAfterUpdate.class);

    private final OneOffRequestContext requestContext;
    private final Provider<InternalChangeQuery> queryProvider;
    private final ChangeIndexer.Factory indexerFactory;
    private final ChangeIndexCollection indexes;
    private final ChangeNotes.Factory notesFactory;
    private final ListeningExecutorService executor;

    @Inject
    ReindexAfterUpdate(OneOffRequestContext requestContext, Provider<InternalChangeQuery> queryProvider,
            ChangeIndexer.Factory indexerFactory, ChangeIndexCollection indexes, ChangeNotes.Factory notesFactory,
            @IndexExecutor(QueueType.BATCH) ListeningExecutorService executor) {
        this.requestContext = requestContext;
        this.queryProvider = queryProvider;
        this.indexerFactory = indexerFactory;
        this.indexes = indexes;
        this.notesFactory = notesFactory;
        this.executor = executor;
    }

    @Override
    public void onGitReferenceUpdated(final Event event) {
        if (event.getRefName().startsWith(RefNames.REFS_CHANGES)
                || event.getRefName().startsWith(RefNames.REFS_DRAFT_COMMENTS)
                || event.getRefName().startsWith(RefNames.REFS_USERS)) {
            return;
        }
        Futures.addCallback(executor.submit(new GetChanges(event)), new FutureCallback<List<Change>>() {
            @Override
            public void onSuccess(List<Change> changes) {
                for (Change c : changes) {
                    executor.submit(new Index(event, c.getId()));
                }
            }

            @Override
            public void onFailure(Throwable ignored) {
                // Logged by {@link GetChanges#call()}.
            }
        });
    }

    private abstract class Task<V> implements Callable<V> {
        protected Event event;

        protected Task(Event event) {
            this.event = event;
        }

        @Override
        public final V call() throws Exception {
            try (ManualRequestContext ctx = requestContext.open()) {
                return impl(ctx);
            } catch (Exception e) {
                log.error("Failed to reindex changes after " + event, e);
                throw e;
            }
        }

        protected abstract V impl(RequestContext ctx) throws Exception;
    }

    private class GetChanges extends Task<List<Change>> {
        private GetChanges(Event event) {
            super(event);
        }

        @Override
        protected List<Change> impl(RequestContext ctx) throws OrmException {
            String ref = event.getRefName();
            Project.NameKey project = new Project.NameKey(event.getProjectName());
            if (ref.equals(RefNames.REFS_CONFIG)) {
                return asChanges(queryProvider.get().byProjectOpen(project));
            }
            return asChanges(queryProvider.get().byBranchOpen(new Branch.NameKey(project, ref)));
        }

        @Override
        public String toString() {
            return "Get changes to reindex caused by " + event.getRefName() + " update of project "
                    + event.getProjectName();
        }
    }

    private class Index extends Task<Void> {
        private final Change.Id id;

        Index(Event event, Change.Id id) {
            super(event);
            this.id = id;
        }

        @Override
        protected Void impl(RequestContext ctx) throws OrmException, IOException, NoSuchChangeException {
            // Reload change, as some time may have passed since GetChanges.
            ReviewDb db = ctx.getReviewDbProvider().get();
            try {
                Change c = notesFactory.createChecked(db, new Project.NameKey(event.getProjectName()), id)
                        .getChange();
                indexerFactory.create(executor, indexes).index(db, c);
            } catch (NoSuchChangeException e) {
                indexerFactory.create(executor, indexes).delete(id);
            }
            return null;
        }

        @Override
        public String toString() {
            return "Index change " + id.get() + " of project " + event.getProjectName();
        }
    }
}