Java tutorial
/** * Copyright 2016-2018 The Thingsboard Authors * * 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.thingsboard.rule.engine.util; import com.google.common.util.concurrent.AsyncFunction; import com.google.common.util.concurrent.Futures; import com.google.common.util.concurrent.ListenableFuture; import org.thingsboard.rule.engine.api.TbContext; import org.thingsboard.rule.engine.api.TbNodeException; import org.thingsboard.server.common.data.HasTenantId; import org.thingsboard.server.common.data.alarm.AlarmId; import org.thingsboard.server.common.data.id.*; public class EntitiesTenantIdAsyncLoader { public static ListenableFuture<TenantId> findEntityIdAsync(TbContext ctx, EntityId original) { switch (original.getEntityType()) { case TENANT: return Futures.immediateFuture((TenantId) original); case CUSTOMER: return getTenantAsync( ctx.getCustomerService().findCustomerByIdAsync(ctx.getTenantId(), (CustomerId) original)); case USER: return getTenantAsync(ctx.getUserService().findUserByIdAsync(ctx.getTenantId(), (UserId) original)); case ASSET: return getTenantAsync(ctx.getAssetService().findAssetByIdAsync(ctx.getTenantId(), (AssetId) original)); case DEVICE: return getTenantAsync( ctx.getDeviceService().findDeviceByIdAsync(ctx.getTenantId(), (DeviceId) original)); case ALARM: return getTenantAsync(ctx.getAlarmService().findAlarmByIdAsync(ctx.getTenantId(), (AlarmId) original)); case RULE_CHAIN: return getTenantAsync( ctx.getRuleChainService().findRuleChainByIdAsync(ctx.getTenantId(), (RuleChainId) original)); default: return Futures.immediateFailedFuture(new TbNodeException("Unexpected original EntityType " + original)); } } private static <T extends HasTenantId> ListenableFuture<TenantId> getTenantAsync(ListenableFuture<T> future) { return Futures.transformAsync(future, in -> { return in != null ? Futures.immediateFuture(in.getTenantId()) : Futures.immediateFuture(null); }); } }