Java tutorial
/* * 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.exception.StaleObjectFileException; import de.ks.flatadocdb.ifc.EntityPersister; import org.apache.commons.codec.digest.DigestUtils; import java.nio.file.Path; public class EntityInsertion extends SessionAction { public EntityInsertion(Repository repository, SessionEntry sessionEntry) { super(repository, sessionEntry); } @Override public void prepare(Session session) { if (sessionEntry.getCompletePath().toFile().exists()) { throw new StaleObjectFileException("Real file already exists" + sessionEntry.getCompletePath()); } checkVersionIncrement(sessionEntry.getCompletePath(), sessionEntry.getVersion()); checkNoFlushFileExists(getFlushPath()); executeLifecycleAction(LifeCycle.PRE_PERSIST); executeLifecycleAction(LifeCycle.PRE_UPDATE); EntityPersister persister = sessionEntry.getEntityDescriptor().getPersister(); byte[] fileContents = persister.createFileContents(repository, sessionEntry.getEntityDescriptor(), sessionEntry.getObject()); writeFlushFile(fileContents); byte[] md5 = DigestUtils.md5(fileContents); sessionEntry.setMd5(md5); Path completePath = sessionEntry.getCompletePath(); sessionEntry.getEntityDescriptor().writePathInRepo(sessionEntry.getObject(), completePath); checkAppendToComplete(sessionEntry.getCompletePath());//better to use Filelock if possible } @Override public void commit(Session session) { moveFlushFile(getFlushPath()); addToIndex(session); executeLifecycleAction(LifeCycle.POST_PERSIST); executeLifecycleAction(LifeCycle.POST_UPDATE); } private void addToIndex(Session session) { session.globalIndex.addEntry(sessionEntry); session.luceneUpdates.add(index -> index.addEntry(sessionEntry)); } }