com.googlesource.gerrit.plugins.xdocs.XDocCache.java Source code

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Here is the source code for com.googlesource.gerrit.plugins.xdocs.XDocCache.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.googlesource.gerrit.plugins.xdocs;

import com.google.common.cache.LoadingCache;
import com.google.common.hash.Hasher;
import com.google.common.hash.Hashing;
import com.google.gerrit.httpd.resources.Resource;
import com.google.gerrit.reviewdb.client.Project;
import com.google.gerrit.server.project.ProjectCache;
import com.google.gerrit.server.project.ProjectState;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import com.google.inject.name.Named;

import com.googlesource.gerrit.plugins.xdocs.formatter.Formatters.FormatterProvider;

import org.eclipse.jgit.lib.ObjectId;

@Singleton
public class XDocCache {
    private final LoadingCache<String, Resource> cache;
    private final ProjectCache projectCache;

    @Inject
    XDocCache(@Named(XDocLoader.Module.X_DOC_RESOURCES) LoadingCache<String, Resource> cache,
            ProjectCache projectCache) {
        this.cache = cache;
        this.projectCache = projectCache;
    }

    public Resource get(FormatterProvider formatter, Project.NameKey project, String file, ObjectId revId,
            ObjectId revIdB, DiffMode diffMode) {
        ProjectState p = projectCache.get(project);
        ObjectId metaConfigRevId = p != null && p.getConfig().getRevision() != null ? p.getConfig().getRevision()
                : ObjectId.zeroId();
        return cache.getUnchecked((new XDocResourceKey(formatter.getName(), project, file, revId, metaConfigRevId,
                getParentsHash(project), revIdB, diffMode)).asString());
    }

    private String getParentsHash(Project.NameKey project) {
        Hasher h = Hashing.md5().newHasher();
        ProjectState p = projectCache.get(project);
        if (p != null) {
            for (ProjectState parent : p.parents()) {
                h.putUnencodedChars(
                        parent.getConfig().getRevision() != null ? parent.getConfig().getRevision().getName()
                                : ObjectId.zeroId().getName());
            }
        }
        return h.hash().toString();
    }
}