| // 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; |
| |
| public interface DataSource { |
| |
| /** |
| * Get data from source. |
| * |
| * @param block |
| * if false, then return immediately when no data is available, |
| * otherwise wait for data |
| * @return new data or null, when no data is available |
| */ |
| ByteBuffer pull(boolean block); |
| |
| /** |
| * Hold data temporary to use at next pull or push. |
| * |
| * @param buf |
| * a data |
| */ |
| void pushBack(ByteBuffer buf); |
| |
| /** |
| * Hold data temporary to use at next pull. Don't return abything untill given |
| * amount of data will be read from source, because data will be pushed back |
| * anyway. |
| * |
| * @param buf |
| * a data |
| * @param lengthOfFullPacket |
| * length of full block of data to read from source |
| */ |
| void pushBack(ByteBuffer buf, int lengthOfFullPacket); |
| |
| /** |
| * Send event to pads. |
| * |
| * @param event |
| * a event |
| * @param direction |
| * pad direction |
| */ |
| void sendEvent(Event event, Direction direction); |
| } |