| /* |
| * 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.seatunnel.connectors.seatunnel.common.source; |
| |
| import org.apache.seatunnel.api.source.SourceEvent; |
| import org.apache.seatunnel.api.source.SourceReader; |
| |
| import java.util.Collections; |
| import java.util.List; |
| |
| public abstract class AbstractSingleSplitReader<T> implements SourceReader<T, SingleSplit> { |
| |
| @Override |
| public final List<SingleSplit> snapshotState(long checkpointId) throws Exception { |
| return Collections.singletonList(new SingleSplit(snapshotStateToBytes(checkpointId))); |
| } |
| |
| protected byte[] snapshotStateToBytes(long checkpointId) throws Exception { |
| // default nothing |
| return null; |
| } |
| |
| @Override |
| public final void addSplits(List<SingleSplit> splits) { |
| if (splits.size() > 1) { |
| throw new UnsupportedOperationException("The single-split reader don't support reading multiple splits"); |
| } |
| byte[] restoredState = splits.get(0).getState(); |
| if (restoredState != null && restoredState.length > 0) { |
| restoreState(restoredState); |
| } |
| } |
| |
| protected void restoreState(byte[] restoredState) { |
| // default nothing |
| } |
| |
| @Override |
| public final void handleNoMoreSplits() { |
| // nothing |
| } |
| |
| @Override |
| public void notifyCheckpointComplete(long checkpointId) throws Exception { |
| // default nothing |
| } |
| |
| @Override |
| public final void handleSourceEvent(SourceEvent sourceEvent) { |
| // nothing |
| } |
| } |