| // 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 streamer; |
| |
| /** |
| * Link is wire between two elements. It always must contain source and sink |
| * elements. |
| */ |
| public interface Link extends DataSource, DataSink, Runnable { |
| |
| /** |
| * Wire this link with given sink. |
| * |
| * @param sink |
| * an Element |
| * @return same sink element, for chaining |
| */ |
| Element setSink(Element sink); |
| |
| /** |
| * Wire this link with given source. |
| * |
| * @param source |
| * an Element |
| * @return same source element, for chaining |
| */ |
| Element setSource(Element source); |
| |
| Element getSource(); |
| |
| Element getSink(); |
| |
| /** |
| * Hold all data in cache, don't pass data to sink until resumed. |
| */ |
| void pause(); |
| |
| /** |
| * Resume transfer. |
| */ |
| void resume(); |
| |
| /** |
| * Change mode of operation of this link from push mode to pull mode. |
| */ |
| void setPullMode(); |
| |
| /** |
| * Drop this link. |
| */ |
| void drop(); |
| } |