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From aljoscha <...@git.apache.org>
Subject [GitHub] flink pull request: [FLINK-2314] Make Streaming File Sources Persistent
Date Tue, 31 May 2016 16:07:32 GMT
Github user aljoscha commented on a diff in the pull request:

    https://github.com/apache/flink/pull/2020#discussion_r65212938
  
    --- Diff: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/functions/source/ContinuousFileMonitoringFunction.java
---
    @@ -0,0 +1,336 @@
    +/*
    + * 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.flink.streaming.api.functions.source;
    +
    +import org.apache.flink.annotation.Internal;
    +import org.apache.flink.api.common.io.FileInputFormat;
    +import org.apache.flink.api.java.tuple.Tuple2;
    +import org.apache.flink.api.java.tuple.Tuple3;
    +import org.apache.flink.configuration.Configuration;
    +import org.apache.flink.core.fs.FileInputSplit;
    +import org.apache.flink.core.fs.FileStatus;
    +import org.apache.flink.core.fs.FileSystem;
    +import org.apache.flink.core.fs.Path;
    +import org.apache.flink.runtime.JobException;
    +import org.apache.flink.streaming.api.checkpoint.Checkpointed;
    +import org.apache.flink.util.Preconditions;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import java.io.IOException;
    +import java.net.URI;
    +import java.util.ArrayList;
    +import java.util.Collections;
    +import java.util.Comparator;
    +import java.util.HashMap;
    +import java.util.Iterator;
    +import java.util.LinkedList;
    +import java.util.List;
    +import java.util.Map;
    +
    +/**
    + * This is the single (non-parallel) task which takes a {@link FileInputFormat} and is
responsible for
    + * i) monitoring a user-provided path, ii) deciding which files should be further read
and processed,
    + * iii) creating the {@link FileInputSplit FileInputSplits} corresponding to those files,
and iv) assigning
    + * them to downstream tasks for further reading and processing. Which splits will be
further processed
    + * depends on the user-provided {@link ProcessingMode} and the {@link FilePathFilter}.
    + * The splits of the files to be read are then forwarded to the downstream
    + * {@link ContinuousFileReaderOperator} which can have parallelism greater than one.
    + */
    +@Internal
    +public class ContinuousFileMonitoringFunction<OUT>
    +	extends RichSourceFunction<FileInputSplit> implements Checkpointed<Tuple3<List<Tuple2<Long,
List<FileInputSplit>>>, Tuple2<Long, List<FileInputSplit>>, Long>>
{
    +
    +	private static final long serialVersionUID = 1L;
    +
    +	private static final Logger LOG = LoggerFactory.getLogger(ContinuousFileMonitoringFunction.class);
    +
    +	/**
    +	 * The minimum interval allowed between consecutive path scans. This is applicable if
the
    +	 * {@code watchType} is set to {@code PROCESS_CONTINUOUSLY}.
    +	 */
    +	public static final long MIN_MONITORING_INTERVAL = 100l;
    +
    +	/**
    +	 * Specifies when computation will be triggered.
    +	 */
    +	public enum ProcessingMode {
    --- End diff --
    
    Also as `PublicEvolving`.


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