de.ks.flatadocdb.session.EntityUpdate.java Source code

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Here is the source code for de.ks.flatadocdb.session.EntityUpdate.java

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/*
 * Copyright [2015] [Christian Loehnert]
 *
 * 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 de.ks.flatadocdb.session;

import de.ks.flatadocdb.Repository;
import de.ks.flatadocdb.annotation.lifecycle.LifeCycle;
import de.ks.flatadocdb.ifc.EntityPersister;
import de.ks.flatadocdb.metamodel.EntityDescriptor;
import org.apache.commons.codec.digest.DigestUtils;

public class EntityUpdate extends SessionAction {
    public EntityUpdate(Repository repository, SessionEntry sessionEntry) {
        super(repository, sessionEntry);
    }

    @Override
    public void prepare(Session session) {
        EntityDescriptor entityDescriptor = sessionEntry.getEntityDescriptor();
        Object entity = sessionEntry.getObject();

        checkVersionIncrement(sessionEntry.getCompletePath(), sessionEntry.getVersion());
        checkNoFlushFileExists(getFlushPath());

        long version = entityDescriptor.getVersion(entity);
        entityDescriptor.writeVersion(entity, version + 1);
        sessionEntry.version++;

        executeLifecycleAction(LifeCycle.PRE_UPDATE);

        EntityPersister persister = entityDescriptor.getPersister();
        byte[] fileContents = persister.createFileContents(repository, entityDescriptor, entity);

        writeFlushFile(fileContents);

        byte[] md5 = DigestUtils.md5(fileContents);
        sessionEntry.setMd5(md5);

        checkAppendToComplete(sessionEntry.getCompletePath());//better to use Filelock if possible
    }

    @Override
    public void commit(Session session) {
        moveFlushFile(getFlushPath());

        executeLifecycleAction(LifeCycle.POST_UPDATE);

        session.globalIndex.updateEntry(sessionEntry);
        session.luceneUpdates.add(index -> index.updateEntry(sessionEntry));
    }
}