/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags.
 *
 * 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 org.keycloak.services.managers;

import org.keycloak.models.KeycloakSession;
import org.keycloak.models.KeycloakSessionFactory;
import org.keycloak.models.KeycloakSessionTask;
import org.keycloak.models.RealmProvider;
import org.keycloak.models.RealmProviderFactory;
import org.keycloak.models.dblock.DBLockProvider;
import org.keycloak.models.dblock.DBLockProviderFactory;
import org.keycloak.models.utils.KeycloakModelUtils;
import org.keycloak.services.ServicesLogger;

/**
 * @author <a href="mailto:mposolda@redhat.com">Marek Posolda</a>
 */
public class DBLockManager {

    protected static final ServicesLogger logger = ServicesLogger.ROOT_LOGGER;

    public void waitForLock(KeycloakSessionFactory sessionFactory) {
        KeycloakModelUtils.runJobInTransaction(sessionFactory, new KeycloakSessionTask() {

            @Override
            public void run(KeycloakSession session) {
                DBLockProvider lock = getDBLock(session);
                lock.waitForLock();
            }

        });
    }


    public void releaseLock(KeycloakSessionFactory sessionFactory) {
        KeycloakModelUtils.runJobInTransaction(sessionFactory, new KeycloakSessionTask() {

            @Override
            public void run(KeycloakSession session) {
                DBLockProvider lock = getDBLock(session);
                lock.releaseLock();
            }

        });
    }


    public void checkForcedUnlock(KeycloakSessionFactory sessionFactory) {
        if (Boolean.getBoolean("keycloak.dblock.forceUnlock")) {
            logger.forcedReleaseDBLock();
            releaseLock(sessionFactory);
        }
    }


    // Try to detect ID from realmProvider
    public DBLockProvider getDBLock(KeycloakSession session) {
        String realmProviderId = getRealmProviderId(session);
        return session.getProvider(DBLockProvider.class, realmProviderId);
    }

    public DBLockProviderFactory getDBLockFactory(KeycloakSession session) {
        String realmProviderId = getRealmProviderId(session);
        return (DBLockProviderFactory) session.getKeycloakSessionFactory().getProviderFactory(DBLockProvider.class, realmProviderId);
    }

    private String getRealmProviderId(KeycloakSession session) {
        RealmProviderFactory realmProviderFactory = (RealmProviderFactory) session.getKeycloakSessionFactory().getProviderFactory(RealmProvider.class);
        return realmProviderFactory.getId();
    }

}
