| /** |
| * 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.heron.streamlet; |
| |
| import org.apache.heron.api.spout.IRichSpout; |
| import org.apache.heron.streamlet.impl.BuilderImpl; |
| |
| /** |
| * Builder is used to register all sources. Builder thus keeps track |
| * of all the starting points of the computation DAG and uses this |
| * information to build the topology |
| */ |
| public interface Builder { |
| static Builder newBuilder() { |
| return new BuilderImpl(); |
| } |
| |
| /** |
| * All sources of the computation should register using addSource. |
| * @param supplier The supplier function that is used to create the streamlet |
| */ |
| <R> Streamlet<R> newSource(SerializableSupplier<R> supplier); |
| |
| /** |
| * Creates a new Streamlet using the underlying generator |
| * @param generator The generator that generates the tuples of the streamlet |
| * @param <R> |
| * @return |
| */ |
| <R> Streamlet<R> newSource(Source<R> generator); |
| |
| /** |
| * Creates a new Streamlet using the provided spout |
| * @param spout The spout that emits the tuples of the streamlet |
| * @param <R> |
| * @return |
| */ |
| <R> Streamlet<R> newSource(IRichSpout spout); |
| } |