| /** |
| * 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 com.datatorrent.lib.appdata; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.google.common.base.Preconditions; |
| |
| import com.datatorrent.api.DefaultInputPort; |
| import com.datatorrent.api.DefaultOutputPort; |
| import com.datatorrent.api.Sink; |
| import com.datatorrent.lib.io.SimpleSinglePortInputOperator.BufferingOutputPort; |
| |
| /** |
| * @since 3.3.0 |
| */ |
| public class StoreUtils |
| { |
| /** |
| * This is a utility method which is used to attach the output port of an {@link EmbeddableQueryInfoProvider} to the input port |
| * of the encapsulating {@link AppData.Store}. |
| * @param <T> The type of data emitted by the {@link EmbeddableQueryInfoProvider}'s output port and received by the |
| * {@link AppData.Store}'s input port. |
| * @param outputPort The output port of the {@link EmbeddableQueryInfoProvider} which is being used by an {@link AppData.Store}. |
| * @param inputPort The input port of the {@link AppData.Store} which is using an {@link EmbeddableQueryInfoProvider}. |
| */ |
| public static <T> void attachOutputPortToInputPort(DefaultOutputPort<T> outputPort, final DefaultInputPort<T> inputPort) |
| { |
| outputPort.setSink(new Sink<Object>() |
| { |
| @Override |
| @SuppressWarnings("unchecked") |
| public void put(Object tuple) |
| { |
| LOG.debug("processing tuple"); |
| inputPort.process((T)tuple); |
| } |
| |
| @Override |
| public int getCount(boolean reset) |
| { |
| return 0; |
| } |
| |
| }); |
| } |
| |
| /** |
| * This is a utility class which is responsible for flushing {@link BufferingOutputPort}s. |
| * @param <TUPLE_TYPE> The type of the tuple emitted by the {@link BufferingOutputPort}. |
| */ |
| public static class BufferingOutputPortFlusher<TUPLE_TYPE> implements Runnable |
| { |
| private final BufferingOutputPort<TUPLE_TYPE> port; |
| |
| public BufferingOutputPortFlusher(BufferingOutputPort<TUPLE_TYPE> port) |
| { |
| this.port = Preconditions.checkNotNull(port); |
| } |
| |
| @Override |
| public void run() |
| { |
| port.flush(Integer.MAX_VALUE); |
| } |
| } |
| |
| private static final Logger LOG = LoggerFactory.getLogger(StoreUtils.class); |
| } |