gobblin.util.io.MeteredInputStreamTest.java Source code

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Here is the source code for gobblin.util.io.MeteredInputStreamTest.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 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 gobblin.util.io;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.io.IOUtils;
import org.testng.Assert;
import org.testng.annotations.Test;

import com.codahale.metrics.Meter;
import com.google.common.base.Charsets;
import com.google.common.base.Optional;

public class MeteredInputStreamTest {

    @Test
    public void test() throws Exception {
        InputStream is = new ByteArrayInputStream("aabbccddee".getBytes(Charsets.UTF_8));

        Meter meter = new Meter();
        MeteredInputStream mis = MeteredInputStream.builder().in(is).meter(meter).updateFrequency(1).build();

        InputStream skipped = new MyInputStream(mis);
        DataInputStream dis = new DataInputStream(skipped);

        ByteArrayOutputStream os = new ByteArrayOutputStream();

        IOUtils.copy(dis, os);
        String output = os.toString(Charsets.UTF_8.name());

        Assert.assertEquals(output, "abcde");

        Optional<MeteredInputStream> meteredOpt = MeteredInputStream.findWrappedMeteredInputStream(dis);
        Assert.assertEquals(meteredOpt.get(), mis);
        Assert.assertEquals(meteredOpt.get().getBytesProcessedMeter().getCount(), 10);
    }

    /**
     * An input stream that skips every second byte
     */
    public static class MyInputStream extends FilterInputStream {
        public MyInputStream(InputStream in) {
            super(in);
        }

        @Override
        public int read() throws IOException {
            int bte = super.read();
            if (bte == -1) {
                return bte;
            }
            return super.read();
        }

        @Override
        public int read(byte[] b, int off, int len) throws IOException {
            for (int i = 0; i < len; i++) {
                byte bte = (byte) read();
                if (bte == -1) {
                    return i == 0 ? -1 : i;
                }
                b[off + i] = bte;
            }
            return len;
        }
    }

}