Examples of java.io.FileInputStream.available()

java.io.FileInputStream.available()
Returns an estimate of the number of remaining bytes that can be read (or skipped over) from this input stream without blocking by the next invocation of a method for this input stream. The next invocation might be the same thread or another thread. A single read or skip of this many bytes will not block, but may read or skip fewer bytes.
In some cases, a non-blocking read (or skip) may appear to be blocked when it is merely slow, for example when reading large files over slow networks. @return an estimate of the number of remaining bytes that can be read(or skipped over) from this input stream without blocking. @exception IOException if this file input stream has been closed by calling{@code close} or an I/O error occurs.

    public BigInteger getHighestSerialNumber() throws CertificateStoreException{
        if(highestSerialNumber == null) {
            // Value has not been cached.  Read from the disk.
            try {
                FileInputStream finp = new FileInputStream(highestSerialFile);
                byte[] data = new byte[finp.available()];
                finp.read(data);
                finp.close();
                highestSerialNumber = new BigInteger(new String(data).trim());
            } catch (Exception e) {
                throw new CertificateStoreException("Error while getting serial number.", e);

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     * @param id Id of the certificate request.
     */
    public String getRequest(String id) {
        try {
            FileInputStream fin = new FileInputStream(new File(dir, id+CERT_REQ_FILE_SUFFIX));
            byte[] data = new byte[fin.available()];
            fin.read(data);
            fin.close();
            return new String(data);
        } catch (Exception e) {
            log.error("Error reading CSR. id = "+id, e);

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                    if( logger.isDebugEnabled())
                        logger.debug("Reading in context state from file");


                    FileInputStream f_in = new FileInputStream(f);


                    if( f_in.available() > 0 )
                    {
                        ObjectInputStream in = new ObjectInputStream(f_in);
                        n = (NamingContextImpl)in.readObject();
                        in.close();
                    }

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                ClassLoader.getSystemResource("file.txt").getPath()
              )
            );
    
    try {
      fileInputStream.available(); // should throw IOException because stream will closed.
    } catch (IOException e) {
      assertTrue(true);
    }
  }

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      {
         try
         {
            MavenXpp3Reader reader = new MavenXpp3Reader();
            FileInputStream stream = new FileInputStream(getUnderlyingResourceObject());
            if (stream.available() > 0)
            {
               currentModel = reader.read(stream);
            }
            stream.close();

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            try {
               if (trace) {
                  log.tracef("Opening file in %s", file);
               }
               fileInStream = new FileInputStream(file);
               int sz = fileInStream.available();
               bis = new BufferedInputStream(fileInStream);
               objectOutput.writeObject(file.getName());
               objectOutput.writeInt(sz);


               while (sz > totalBytesRead) {

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      HCatRecord rec = new DefaultHCatRecord();
      rec.readFields(inpStream);
      Assert.assertEquals(recs[i],rec);
    }


    Assert.assertEquals(fInStream.available(), 0);
    fInStream.close();


  }


  public void testCompareTo() {

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    Path fnLocal = new Path(System.getProperty("test.concat.data", "/tmp"), fn);
    Path fnHDFS  = new Path(workDir, fn);
    localFs.copyFromLocalFile(fnLocal, fnHDFS);


    final FileInputStream in = new FileInputStream(fnLocal.toString());
    assertEquals("concat bytes available", 148, in.available());


    // should wrap all of this header-reading stuff in a running-CRC wrapper
    // (did so in BuiltInGzipDecompressor; see below)


    byte[] compressedBuf = new byte[256];

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    // here's first pair of DecompressorStreams:
    final FileInputStream in1 = new FileInputStream(fnLocal1.toString());
    final FileInputStream in2 = new FileInputStream(fnLocal2.toString());
    assertEquals("concat bytes available", 2734, in1.available());
    assertEquals("concat bytes available", 3413, in2.available()); // w/hdr CRC


    CompressionInputStream cin2 = gzip.createInputStream(in2);
    LineReader in = new LineReader(cin2);
    Text out = new Text();

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    // here's first pair of BlockDecompressorStreams:
    final FileInputStream in1 = new FileInputStream(fnLocal1.toString());
    final FileInputStream in2 = new FileInputStream(fnLocal2.toString());
    assertEquals("concat bytes available", 2567, in1.available());
    assertEquals("concat bytes available", 3056, in2.available());


/*
    // FIXME
    // The while-loop below dies at the beginning of the 2nd concatenated
    // member (after 17 lines successfully read) with:

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