public static void main()

in bookkeeper-benchmark/src/main/java/org/apache/bookkeeper/benchmark/TestClient.java [68:198]
118 lines of code
20 McCabe index (conditional complexity)

    public static void main(String[] args) throws ParseException {
        Options options = new Options();
        options.addOption("length", true, "Length of packets being written. Default 1024");
        options.addOption("target", true, "Target medium to write to. Options are bk, fs & hdfs. Default fs");
        options.addOption("runfor", true, "Number of seconds to run for. Default 60");
        options.addOption("path", true, "Path to write to. fs & hdfs only. Default /foobar");
        options.addOption("zkservers", true, "ZooKeeper servers, comma separated. bk only. Default localhost:2181.");
        options.addOption("bkensemble", true, "BookKeeper ledger ensemble size. bk only. Default 3");
        options.addOption("bkquorum", true, "BookKeeper ledger quorum size. bk only. Default 2");
        options.addOption("bkthrottle", true, "BookKeeper throttle size. bk only. Default 10000");
        options.addOption("sync", false, "Use synchronous writes with BookKeeper. bk only.");
        options.addOption("numconcurrent", true, "Number of concurrently clients. Default 1");
        options.addOption("timeout", true, "Number of seconds after which to give up");
        options.addOption("help", false, "This message");

        CommandLineParser parser = new PosixParser();
        CommandLine cmd = parser.parse(options, args);

        if (cmd.hasOption("help")) {
            HelpFormatter formatter = new HelpFormatter();
            formatter.printHelp("TestClient <options>", options);
            System.exit(-1);
        }

        int length = Integer.parseInt(cmd.getOptionValue("length", "1024"));
        String target = cmd.getOptionValue("target", "fs");
        long runfor = Long.parseLong(cmd.getOptionValue("runfor", "60")) * 1000;

        StringBuilder sb = new StringBuilder();
        while (length-- > 0) {
            sb.append('a');
        }

        Timer timeouter = new Timer();
        if (cmd.hasOption("timeout")) {
            final long timeout = Long.parseLong(cmd.getOptionValue("timeout", "360")) * 1000;

            timeouter.schedule(new TimerTask() {
                    @Override
                    public void run() {
                        System.err.println("Timing out benchmark after " + timeout + "ms");
                        System.exit(-1);
                    }
                }, timeout);
        }

        BookKeeper bkc = null;
        try {
            int numFiles = Integer.parseInt(cmd.getOptionValue("numconcurrent", "1"));
            int numThreads = Math.min(numFiles, 1000);
            byte[] data = sb.toString().getBytes(UTF_8);
            long runid = System.currentTimeMillis();
            List<Callable<Long>> clients = new ArrayList<Callable<Long>>();

            if (target.equals("bk")) {
                String zkservers = cmd.getOptionValue("zkservers", "localhost:2181");
                int bkensemble = Integer.parseInt(cmd.getOptionValue("bkensemble", "3"));
                int bkquorum = Integer.parseInt(cmd.getOptionValue("bkquorum", "2"));
                int bkthrottle = Integer.parseInt(cmd.getOptionValue("bkthrottle", "10000"));

                ClientConfiguration conf = new ClientConfiguration();
                conf.setThrottleValue(bkthrottle);
                conf.setMetadataServiceUri("zk://" + zkservers + "/ledgers");

                bkc = new BookKeeper(conf);
                List<LedgerHandle> handles = new ArrayList<LedgerHandle>();
                for (int i = 0; i < numFiles; i++) {
                    handles.add(bkc.createLedger(bkensemble, bkquorum, DigestType.CRC32, new byte[] {'a', 'b'}));
                }
                for (int i = 0; i < numFiles; i++) {
                    clients.add(new BKClient(handles, data, runfor, cmd.hasOption("sync")));
                }
            } else if (target.equals("fs")) {
                List<FileOutputStream> streams = new ArrayList<FileOutputStream>();
                for (int i = 0; i < numFiles; i++) {
                    String path = cmd.getOptionValue("path", "/foobar " + i);
                    streams.add(new FileOutputStream(path + runid + "_" + i));
                }

                for (int i = 0; i < numThreads; i++) {
                    clients.add(new FileClient(streams, data, runfor));
                }
            } else {
                LOG.error("Unknown option: " + target);
                throw new IllegalArgumentException("Unknown target " + target);
            }

            ExecutorService executor = Executors.newFixedThreadPool(numThreads);
            long start = System.currentTimeMillis();

            List<Future<Long>> results = executor.invokeAll(clients,
                                                            10, TimeUnit.MINUTES);
            long end = System.currentTimeMillis();
            long count = 0;
            for (Future<Long> r : results) {
                if (!r.isDone()) {
                    LOG.warn("Job didn't complete");
                    System.exit(2);
                }
                long c = r.get();
                if (c == 0) {
                    LOG.warn("Task didn't complete");
                }
                count += c;
            }
            long time = end - start;
            LOG.info("Finished processing writes (ms): {} TPT: {} op/s", time, count / ((double) time / 1000));
            executor.shutdown();
        } catch (ExecutionException ee) {
            LOG.error("Exception in worker", ee);
        } catch (BKException e) {
            LOG.error("Error accessing bookkeeper", e);
        } catch (IOException ioe) {
            LOG.error("I/O exception during benchmark", ioe);
        } catch (InterruptedException ie) {
            LOG.error("Benchmark interrupted", ie);
            Thread.currentThread().interrupt();
        } finally {
            if (bkc != null) {
                try {
                    bkc.close();
                } catch (BKException bke) {
                    LOG.error("Error closing bookkeeper client", bke);
                } catch (InterruptedException ie) {
                    LOG.warn("Interrupted closing bookkeeper client", ie);
                    Thread.currentThread().interrupt();
                }
            }
        }
        timeouter.cancel();
    }