elasticsearch索引index之engine读写控制结构实现

public abstract void create(Create create) throws EngineException;
    public abstract void index(Index index) throws EngineException;
    public abstract void delete(Delete delete) throws EngineException;
    public abstract void delete(DeleteByQuery delete) throws EngineException;

public static abstract class IndexingOperation implements Operation {
        private final DocumentMapper docMapper;
        private final Term uid;
        private final ParsedDocument doc;
        private long version;
        private final VersionType versionType;
        private final Origin origin;
        private final boolean canHaveDuplicates;
        private final long startTime;
        private long endTime;
    ………………
}

private void innerIndex(Index index) throws IOException {
        synchronized (dirtyLock(index.uid())) {
            final long currentVersion;
            VersionValue versionValue = versionMap.getUnderLock(index.uid().bytes());
            if (versionValue == null) {
                currentVersion = loadCurrentVersionFromIndex(index.uid());
            } else {
                if (engineConfig.isEnableGcDeletes() && versionValue.delete() && (engineConfig.getThreadPool().estimatedTimeInMillis() - versionValue.time()) > engineConfig.getGcDeletesInMillis()) {
                    currentVersion = Versions.NOT_FOUND; // deleted, and GC
                } else {
                    currentVersion = versionValue.version();
                }
            }
            long updatedVersion;
            long expectedVersion = index.version();
            if (index.versionType().isVersionConflictForWrites(currentVersion, expectedVersion)) {
                if (index.origin() == Operation.Origin.RECOVERY) {
                    return;
                } else {
                    throw new VersionConflictEngineException(shardId, index.type(), index.id(), currentVersion, expectedVersion);
                }
            }
            updatedVersion = index.versionType().updateVersion(currentVersion, expectedVersion);
            index.updateVersion(updatedVersion);
            if (currentVersion == Versions.NOT_FOUND) {
                // document does not exists, we can optimize for create
                index.created(true);
                if (index.docs().size() > 1) {
                    indexWriter.addDocuments(index.docs(), index.analyzer());
                } else {
                    indexWriter.addDocument(index.docs().get(0), index.analyzer());
                }
            } else {
                if (versionValue != null) {
                    index.created(versionValue.delete()); // we have a delete which is not GC'ed...
                }
                if (index.docs().size() > 1) {
                    indexWriter.updateDocuments(index.uid(), index.docs(), index.analyzer());//获取IndexOperation中doc中字段更新索引
                } else {
                    indexWriter.updateDocument(index.uid(), index.docs().get(0), index.analyzer());
                }
            }
            Translog.Location translogLocation = translog.add(new Translog.Index(index));//写translog
            versionMap.putUnderLock(index.uid().bytes(), new VersionValue(updatedVersion, translogLocation));
            indexingService.postIndexUnderLock(index);
        }
    }