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.HasCustomerId; import org.thingsboard.server.common.data.id.*; public class EntitiesCustomerIdAsyncLoader { public static ListenableFuture<CustomerId> findEntityIdAsync(TbContext ctx, EntityId original) { switch (original.getEntityType()) { case CUSTOMER: return Futures.immediateFuture((CustomerId) original); case USER: return getCustomerAsync(ctx.getUserService().findUserByIdAsync(ctx.getTenantId(), (UserId) original)); case ASSET: return getCustomerAsync( ctx.getAssetService().findAssetByIdAsync(ctx.getTenantId(), (AssetId) original)); case DEVICE: return getCustomerAsync( ctx.getDeviceService().findDeviceByIdAsync(ctx.getTenantId(), (DeviceId) original)); default: return Futures.immediateFailedFuture(new TbNodeException("Unexpected original EntityType " + original)); } } private static <T extends HasCustomerId> ListenableFuture<CustomerId> getCustomerAsync( ListenableFuture<T> future) { return Futures.transformAsync(future, in -> in != null ? Futures.immediateFuture(in.getCustomerId()) : Futures.immediateFuture(null)); } }