| /* |
| 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.edgent.oplet.functional; |
| |
| import static org.apache.edgent.function.Functions.closeFunction; |
| |
| import java.util.concurrent.TimeUnit; |
| |
| import org.apache.edgent.function.Supplier; |
| import org.apache.edgent.oplet.OpletContext; |
| import org.apache.edgent.oplet.core.PeriodicSource; |
| |
| public class SupplierPeriodicSource<T> extends PeriodicSource<T> { |
| |
| private Supplier<T> data; |
| |
| public SupplierPeriodicSource(long period, TimeUnit unit, Supplier<T> data) { |
| super(period, unit); |
| this.data = data; |
| } |
| |
| @Override |
| public void initialize(OpletContext<Void, T> context) { |
| super.initialize(context); |
| } |
| |
| @Override |
| public void close() throws Exception { |
| closeFunction(data); |
| } |
| |
| @Override |
| public void fetchTuples() { |
| T tuple = data.get(); |
| if (tuple != null) |
| submit(tuple); |
| } |
| } |