// 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();
}