de.arbeitsagentur.opdt.keycloak.cassandra.transaction.TransactionalProvider Maven / Gradle / Ivy

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/*
 * Copyright 2023 IT-Systemhaus der Bundesagentur fuer Arbeit
 *
 * 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.arbeitsagentur.opdt.keycloak.cassandra.transaction;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.BiFunction;
import java.util.function.Function;
import lombok.extern.jbosslog.JBossLog;
import org.keycloak.models.KeycloakSession;
import org.keycloak.models.RealmModel;
import org.keycloak.provider.Provider;

@JBossLog
public abstract class TransactionalProvider<
        TEntity extends TransactionalEntity, TModel extends TransactionalModelAdapter>
    implements Provider {

  protected final KeycloakSession session;
  protected final Map models = new ConcurrentHashMap<>();

  public TransactionalProvider(KeycloakSession session) {
    this.session = session;
  }

  protected abstract TModel createNewModel(RealmModel realm, TEntity entity);

  protected Function entityToAdapterFunc(RealmModel realm) {
    return entityToAdapterFunc(realm, this::createNewModel);
  }

  protected Function entityToAdapterFunc(
      RealmModel realm, BiFunction adapterFactory) {
    return origEntity -> {
      if (origEntity == null) {
        return null;
      }

      TModel existingModel = models.get(origEntity.getId());
      if (existingModel != null) {
        log.tracef("Return cached model for id %s", origEntity.getId());
        return existingModel;
      }

      TModel adapter = adapterFactory.apply(realm, origEntity);

      session
          .getTransactionManager()
          .enlistAfterCompletion(
              new CassandraModelTransaction() {
                @Override
                public void commit() {
                  log.tracef("Flush model with id %s", adapter.getId());
                  adapter.commit();
                  models.remove(adapter.getId());
                }

                @Override
                public void rollback() {
                  log.tracef("Rollback model with id %s", adapter.getId());
                  adapter.rollback();
                  models.remove(adapter.getId());
                }
              });

      models.put(adapter.getId(), adapter);
      return adapter;
    };
  }

  @Override
  public void close() {
    models.clear();
  }
}