| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.flink.statefun.flink.core.translation; |
| |
| import java.util.Map; |
| import java.util.Objects; |
| import org.apache.flink.statefun.flink.core.StatefulFunctionsUniverse; |
| import org.apache.flink.statefun.flink.core.common.Maps; |
| import org.apache.flink.statefun.flink.io.spi.SourceProvider; |
| import org.apache.flink.statefun.sdk.io.IngressIdentifier; |
| import org.apache.flink.statefun.sdk.io.IngressSpec; |
| import org.apache.flink.streaming.api.functions.source.SourceFunction; |
| |
| final class IngressToSourceFunctionTranslator { |
| private final StatefulFunctionsUniverse universe; |
| |
| IngressToSourceFunctionTranslator(StatefulFunctionsUniverse universe) { |
| this.universe = Objects.requireNonNull(universe); |
| } |
| |
| Map<IngressIdentifier<?>, DecoratedSource> translate() { |
| return Maps.transformValues(universe.ingress(), this::sourceFromSpec); |
| } |
| |
| private DecoratedSource sourceFromSpec(IngressIdentifier<?> key, IngressSpec<?> spec) { |
| SourceProvider provider = universe.sources().get(spec.type()); |
| if (provider == null) { |
| throw new IllegalStateException( |
| "Unable to find a source translation for ingress of type " |
| + spec.type() |
| + ", which is bound for key " |
| + key); |
| } |
| SourceFunction<?> source = provider.forSpec(spec); |
| if (source == null) { |
| throw new NullPointerException( |
| "A source provider for type " + spec.type() + ", has produced a NULL source."); |
| } |
| return DecoratedSource.of(spec, source); |
| } |
| } |