org.apache.streams.console.ConsolePersistReader.java Source code

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Here is the source code for org.apache.streams.console.ConsolePersistReader.java

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/*
 * 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
 *
 *   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.streams.console;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.base.Preconditions;
import org.apache.streams.core.StreamsDatum;
import org.apache.streams.core.StreamsPersistReader;
import org.apache.streams.core.StreamsPersistWriter;
import org.apache.streams.core.StreamsResultSet;
import org.joda.time.DateTime;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.BufferedInputStream;
import java.io.InputStream;
import java.io.PrintStream;
import java.math.BigInteger;
import java.util.Queue;
import java.util.Scanner;
import java.util.concurrent.ConcurrentLinkedQueue;

public class ConsolePersistReader implements StreamsPersistReader {

    private final static String STREAMS_ID = "ConsolePersistReader";

    private static final Logger LOGGER = LoggerFactory.getLogger(ConsolePersistReader.class);

    protected volatile Queue<StreamsDatum> persistQueue;

    protected InputStream inputStream = System.in;

    public ConsolePersistReader() {
        this.persistQueue = new ConcurrentLinkedQueue<StreamsDatum>();
    }

    public ConsolePersistReader(InputStream inputStream) {
        this();
        this.inputStream = inputStream;
    }

    public void prepare(Object o) {

    }

    public void cleanUp() {

    }

    @Override
    public void startStream() {
        // no op
    }

    @Override
    public StreamsResultSet readAll() {
        return readCurrent();
    }

    @Override
    public StreamsResultSet readCurrent() {

        LOGGER.info("{} readCurrent", STREAMS_ID);

        Scanner sc = new Scanner(inputStream);

        while (sc.hasNextLine()) {

            persistQueue.offer(new StreamsDatum(sc.nextLine()));

        }

        LOGGER.info("Providing {} docs", persistQueue.size());

        StreamsResultSet result = new StreamsResultSet(persistQueue);

        LOGGER.info("{} Exiting", STREAMS_ID);

        return result;

    }

    @Override
    public StreamsResultSet readNew(BigInteger sequence) {
        return readCurrent();
    }

    @Override
    public StreamsResultSet readRange(DateTime start, DateTime end) {
        return readCurrent();
    }

    @Override
    public boolean isRunning() {
        return true; //Will always be running
    }
}