Example usage for java.io RandomAccessFile readLine

Introduction

In this page you can find the example usage for java.io RandomAccessFile readLine.

Prototype

public final String readLine() throws IOException 

Source Link

Document

Reads the next line of text from this file.

Usage

From source file:com.netease.qa.emmagee.utils.CpuInfo.java

/**
 * read stat of each CPU cores/*from   w  w w  .j a  v a 2  s  . co  m*/
 */
private void readTotalCpuStat() {
    try {
        // monitor total and idle cpu stat of certain process
        RandomAccessFile cpuInfo = new RandomAccessFile(CPU_STAT, "r");
        String line = "";
        while ((null != (line = cpuInfo.readLine())) && line.startsWith("cpu")) {
            String[] toks = line.split("\\s+");
            idleCpu.add(Long.parseLong(toks[4]));
            totalCpu.add(Long.parseLong(toks[1]) + Long.parseLong(toks[2]) + Long.parseLong(toks[3])
                    + Long.parseLong(toks[4]) + Long.parseLong(toks[6]) + Long.parseLong(toks[5])
                    + Long.parseLong(toks[7]));
        }
        cpuInfo.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

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From source file:org.apache.cassandra.db.VerifyTest.java

@Test
public void testVerifyIncorrectDigest() throws IOException, WriteTimeoutException {
    CompactionManager.instance.disableAutoCompaction();
    Keyspace keyspace = Keyspace.open(KEYSPACE);
    ColumnFamilyStore cfs = keyspace.getColumnFamilyStore(CORRUPT_CF);

    fillCF(cfs, KEYSPACE, CORRUPT_CF, 2);

    List<Row> rows = cfs.getRangeSlice(Util.range("", ""), null, new IdentityQueryFilter(), 1000);

    SSTableReader sstable = cfs.getSSTables().iterator().next();

    RandomAccessFile file = new RandomAccessFile(sstable.descriptor.filenameFor(Component.DIGEST), "rw");
    Long correctChecksum = Long.parseLong(file.readLine());
    file.close();/*from   w  ww  .ja  v  a2 s.c o m*/

    writeChecksum(++correctChecksum, sstable.descriptor.filenameFor(Component.DIGEST));

    Verifier verifier = new Verifier(cfs, sstable, false);
    try {
        verifier.verify(false);
        fail("Expected a CorruptSSTableException to be thrown");
    } catch (CorruptSSTableException err) {
    }
}

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From source file:com.netease.qa.emmagee.utils.CpuInfo.java

/**
 * get CPU name./* ww w  . j a v a  2 s  . c  o m*/
 * 
 * @return CPU name
 */
public String getCpuName() {
    try {
        RandomAccessFile cpuStat = new RandomAccessFile(CPU_INFO_PATH, "r");
        // check cpu type
        String line;
        while (null != (line = cpuStat.readLine())) {
            String[] values = line.split(":");
            if (values[0].contains(INTEL_CPU_NAME) || values[0].contains("Processor")) {
                cpuStat.close();
                Log.d(LOG_TAG, "CPU name=" + values[1]);
                return values[1];
            }
        }
    } catch (IOException e) {
        Log.e(LOG_TAG, "IOException: " + e.getMessage());
    }
    return "";
}

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From source file:com.piaoyou.util.FileUtil.java

public static String[] getLastLines(File file, int linesToReturn) throws IOException, FileNotFoundException {

    final int AVERAGE_CHARS_PER_LINE = 250;
    final int BYTES_PER_CHAR = 2;

    RandomAccessFile randomAccessFile = null;
    StringBuffer buffer = new StringBuffer(linesToReturn * AVERAGE_CHARS_PER_LINE);
    int lineTotal = 0;
    try {/*from w  w  w. j a va 2s.c o m*/
        randomAccessFile = new RandomAccessFile(file, "r");
        long byteTotal = randomAccessFile.length();
        long byteEstimateToRead = linesToReturn * AVERAGE_CHARS_PER_LINE * BYTES_PER_CHAR;

        long offset = byteTotal - byteEstimateToRead;
        if (offset < 0) {
            offset = 0;
        }

        randomAccessFile.seek(offset);
        //log.debug("SKIP IS ::" + offset);

        String line = null;
        String lineUTF8 = null;
        while ((line = randomAccessFile.readLine()) != null) {
            lineUTF8 = new String(line.getBytes("ISO8859_1"), "UTF-8");
            lineTotal++;
            buffer.append(lineUTF8).append('\n');
        }
    } finally {
        if (randomAccessFile != null) {
            try {
                randomAccessFile.close();
            } catch (IOException ex) {
            }
        }
    }

    String[] resultLines = new String[linesToReturn];
    BufferedReader in = null;
    try {
        in = new BufferedReader(new StringReader(buffer.toString()));

        int start = lineTotal /* + 2 */ - linesToReturn; // Ex : 55 - 10 = 45 ~ offset
        if (start < 0)
            start = 0; // not start line
        for (int i = 0; i < start; i++) {
            in.readLine(); // loop until the offset. Ex: loop 0, 1 ~~ 2 lines
        }

        int i = 0;
        String line = null;
        while ((line = in.readLine()) != null) {
            resultLines[i] = line;
            i++;
        }
    } catch (IOException ie) {
        log.error("Error" + ie);
        throw ie;
    } finally {
        if (in != null) {
            try {
                in.close();
            } catch (IOException ex) {
            }
        }
    }
    return resultLines;
}

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From source file:com.datasayer.meerkat.MeerJobRunner.java

@SuppressWarnings("unchecked")
@Override//from  ww w  .  j a  v  a2  s. co m
public void bsp(final BSPPeer<Writable, Writable, Writable, Writable, Writable> peer)
        throws IOException, SyncException, InterruptedException {

    while (true) {
        try {
            long currentTime = System.currentTimeMillis();
            FileSystem fs = FileSystem.get(conf);
            if (!fs.isFile(logPath)) {
                System.out.println("can not read input file");
                return;
            }
            RandomAccessFile file = new RandomAccessFile(logPath.toString(), "r");
            long fileLength = file.length();

            if (fileLength > filePointer) {
                file.seek(filePointer);
                String line = null;
                while (file.length() > file.getFilePointer()) {
                    line = file.readLine();
                    line = new String(line.getBytes("8859_1"), "utf-8");
                    guardMeer.observe(line);
                }
                filePointer = file.getFilePointer();
            } else {
                // nothing to do
            }
            file.close();

            long timeDiff = currentTime - this.lastAggregatedTime;
            if (timeDiff >= this.aggregationInterval) {

                peer.sync();

                if (peer.getPeerName().equals(masterName)) {
                    bossMeer.masterCompute(new Iterator<Writable>() {

                        private final int producedMessages = peer.getNumCurrentMessages();
                        private int consumedMessages = 0;

                        @Override
                        public boolean hasNext() {
                            return producedMessages > consumedMessages;
                        }

                        @Override
                        public Writable next() throws NoSuchElementException {
                            if (consumedMessages >= producedMessages) {
                                throw new NoSuchElementException();
                            }

                            try {
                                consumedMessages++;
                                return peer.getCurrentMessage();
                            } catch (IOException e) {
                                throw new NoSuchElementException();
                            }
                        }

                        @Override
                        public void remove() {
                            // BSPPeer.getCurrentMessage originally deletes a message.
                            // Thus, it doesn't need to throw exception.
                            // throw new UnsupportedOperationException();
                        }

                    }, signalMeer);
                    this.lastAggregatedTime = currentTime;
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

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From source file:org.jraf.irondad.handler.pixgame.PixGameHandler.java

public String getRandomWord(HandlerContext handlerContext) throws IOException {
    RandomAccessFile file = new RandomAccessFile(
            ((PixGameHandlerConfig) handlerContext.getHandlerConfig()).getDictPath(), "r");
    file.seek((long) (Math.random() * file.length()));
    // Eat the characters of the current line to go to beginning of the next line
    file.readLine();
    // Now read and return the line
    return file.readLine();
}

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From source file:com.netease.qa.emmagee.utils.CpuInfo.java

/**
 * read the status of CPU./*from www.  j av  a2  s  .co m*/
 * 
 * @throws FileNotFoundException
 */
public void readCpuStat() {
    String processPid = Integer.toString(pid);
    String cpuStatPath = "/proc/" + processPid + "/stat";
    try {
        // monitor cpu stat of certain process
        RandomAccessFile processCpuInfo = new RandomAccessFile(cpuStatPath, "r");
        String line = "";
        StringBuffer stringBuffer = new StringBuffer();
        stringBuffer.setLength(0);
        while ((line = processCpuInfo.readLine()) != null) {
            stringBuffer.append(line + "\n");
        }
        String[] tok = stringBuffer.toString().split(" ");
        processCpu = Long.parseLong(tok[13]) + Long.parseLong(tok[14]);
        processCpuInfo.close();
    } catch (FileNotFoundException e) {
        Log.w(LOG_TAG, "FileNotFoundException: " + e.getMessage());
    } catch (IOException e) {
        e.printStackTrace();
    }
    readTotalCpuStat();
}

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From source file:hydrograph.ui.perspective.dialog.PreStartActivity.java

private boolean updateINIOnJDKUpgrade(String javaHome) {
    logger.debug("Updating INI file if JDK path is updated");
    RandomAccessFile file = null;
    boolean isUpdated = false;
    try {/* ww  w.  ja v  a2s .c  om*/
        file = new RandomAccessFile(new File(HYDROGRAPH_INI), "rw");
        byte[] text = new byte[(int) file.length()];

        while (file.getFilePointer() != file.length()) {
            if (StringUtils.equals(file.readLine(), "-vm")) {
                String currentLine = file.readLine();
                if (StringUtils.equals(currentLine, javaHome)) {
                    logger.debug("JAVA_HOME and -vm in configuration file are same");
                } else {
                    logger.debug(
                            "JAVA_HOME and -vm in configuration file are different. Updating configuration file with JAVA_HOME");
                    file.seek(0);
                    file.readFully(text);
                    file.seek(0);
                    updateData(text, javaHome, currentLine, file);
                    isUpdated = true;
                }
                break;
            }
        }
    } catch (IOException ioException) {
        logger.error("IOException occurred while updating " + HYDROGRAPH_INI + " file", ioException);
    } finally {
        try {
            if (file != null) {
                file.close();
            }
        } catch (IOException ioException) {
            logger.error("IOException occurred while closing " + HYDROGRAPH_INI + " file", ioException);
        }
    }
    return isUpdated;
}

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From source file:org.ms123.common.git.GitServiceImpl.java

protected static String getFileType(File file) {
    if (file.isDirectory()) {
        return "sw.directory";
    } else if (file.toString().endsWith(".txt")) {
        return "text/plain";
    } else if (file.toString().endsWith(".jpeg") || file.toString().endsWith(".jpg")) {
        return "image/jpeg";
    } else if (file.toString().endsWith(".png")) {
        return "image/png";
    } else if (file.toString().endsWith(".svg")) {
        return "image/svg+xml";
    } else if (file.toString().endsWith(".xml")) {
        return "text/xml";
    } else if (file.toString().endsWith(".woff") || file.toString().endsWith(".woff.gz")) {
        return "application/x-font-woff";
    } else if (file.toString().endsWith(".js") || file.toString().endsWith(".js.gz")) {
        return "text/javascript";
    } else if (file.toString().endsWith(".adoc") || file.toString().endsWith(".adoc.gz")) {
        return "text/x-asciidoc";
    } else if (file.toString().endsWith(".html") || file.toString().endsWith(".html.gz")) {
        return "text/html";
    } else if (file.toString().endsWith(".css") || file.toString().endsWith(".css.gz")) {
        return "text/css";
    } else if (file.toString().endsWith(".yaml") || file.toString().endsWith(".yml")) {
        return "text/x-yaml";
    } else if (file.toString().endsWith(".json") || file.toString().endsWith(".json.gz")) {
        return "application/json";
    } else if (file.toString().endsWith(".odt")) {
        return "application/vnd.oasis.opendocument.text";
    } else if (file.toString().endsWith(".groovy")) {
        return "sw.groovy";
    } else if (file.toString().endsWith(".java")) {
        return "sw.java";
    }/*  w ww  .j  a va2 s  .com*/
    RandomAccessFile r = null;
    try {
        int lnr = 0;
        r = new RandomAccessFile(file, "r");
        int i = r.readInt();
        if (i == 1534293853) {
            r.seek(0);
            while (true) {
                String line = r.readLine();
                if (line == null) {
                    break;
                }
                if (lnr == 0 && !line.startsWith("[sw]"))
                    break;
                if (line.trim().startsWith("type")) {
                    int eq = line.indexOf("=");
                    if (eq != -1) {
                        return line.substring(eq + 1).trim();
                    }
                }
                lnr++;
                if (lnr > 20)
                    break;
            }
        } else if (i == -2555936) {
            return "image/jpeg";
        } else if (i == -1991225785) {
            return "image/png";
        }
    } catch (Exception e) {
        return "sw.unknown";
    } finally {
        closeFile(r);
    }
    return detectFileType(file);
}

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From source file:com.landenlabs.all_devtool.ConsoleFragment.java

/**
 * Gets total system cpu usage (not just this app)
 * @return//from  w w  w  . ja v  a 2  s  .  c o  m
 */
private float getCpuUsage() {
    try {
        RandomAccessFile reader = new RandomAccessFile("/proc/stat", "r");
        String load = reader.readLine();

        String[] toks = load.split(" ");

        long idle1 = Long.parseLong(toks[5]);
        long cpu1 = Long.parseLong(toks[2]) + Long.parseLong(toks[3]) + Long.parseLong(toks[4])
                + Long.parseLong(toks[6]) + Long.parseLong(toks[7]) + Long.parseLong(toks[8]);

        try {
            Thread.sleep(360);
        } catch (Exception e) {
        }

        reader.seek(0);
        load = reader.readLine();
        reader.close();

        toks = load.split(" ");

        long idle2 = Long.parseLong(toks[5]);
        long cpu2 = Long.parseLong(toks[2]) + Long.parseLong(toks[3]) + Long.parseLong(toks[4])
                + Long.parseLong(toks[6]) + Long.parseLong(toks[7]) + Long.parseLong(toks[8]);

        return (float) (cpu2 - cpu1) / ((cpu2 + idle2) - (cpu1 + idle1));

    } catch (IOException ex) {
        ex.printStackTrace();
    }

    return 0;
}

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