### Question:
GrokRecordFormat extends RecordFormat<ByteBuffer, StructuredRecord> { @Override public StructuredRecord read(ByteBuffer input) throws UnexpectedFormatException { String bodyAsStr = Bytes.toString(input, StandardCharsets.UTF_8); StructuredRecord.Builder builder = StructuredRecord.builder(schema); Match gm = grok.match(bodyAsStr); gm.captures(); Map<String, Object> x = gm.toMap(); for (Schema.Field field : schema.getFields()) { String fieldName = field.getName(); Object value = x.get(fieldName); if (value != null) { builder.convertAndSet(fieldName, value.toString()); } } return builder.build(); }  static Map<String, String> settings(String pattern); @Override StructuredRecord read(ByteBuffer input); String getPattern();  }### Answer:
@Test public void testSyslog() throws Exception { FormatSpecification spec = new FormatSpecification(Formats.SYSLOG, null, Collections.<String, String>emptyMap()); RecordFormat<ByteBuffer, StructuredRecord> format = RecordFormats.createInitializedFormat(spec); String message = "Oct 17 08:59:00 suod newsyslog[6215]: logfile turned over"; StructuredRecord record = format.read(ByteBuffer.wrap(Bytes.toBytes(message))); Assert.assertEquals("Oct 17 08:59:00", record.get("timestamp")); Assert.assertEquals("suod", record.get("logsource")); Assert.assertEquals("newsyslog", record.get("program")); Assert.assertEquals("6215", record.get("pid")); Assert.assertEquals("logfile turned over", record.get("message")); message = "Oct 17 08:59:04 cdr.cs.colorado.edu amd[29648]: " + "noconn option exists, and was turned on! (May cause NFS hangs on some systems...)"; record = format.read(ByteBuffer.wrap(Bytes.toBytes(message))); Assert.assertEquals("Oct 17 08:59:04", record.get("timestamp")); Assert.assertEquals("cdr.cs.colorado.edu", record.get("logsource")); Assert.assertEquals("amd", record.get("program")); Assert.assertEquals("29648", record.get("pid")); Assert.assertEquals("noconn option exists, and was turned on! (May cause NFS hangs on some systems...)", record.get("message")); }