diff --git a/Docs/build/html/_modules/index.html b/Docs/build/html/_modules/index.html index 767990934..eb719722c 100644 --- a/Docs/build/html/_modules/index.html +++ b/Docs/build/html/_modules/index.html @@ -37,12 +37,26 @@

All modules for which code is available

  • pyDKB.common.exceptions
  • pyDKB.common.hdfs
  • pyDKB.common.json_utils
    • -
  • pyDKB.dataflow.dkbID
    • +
  • pyDKB.dataflow.communication.consumer
    • +
  • pyDKB.dataflow.communication.messages
    • +
  • pyDKB.dataflow.communication.producer
    • +
  • pyDKB.dataflow.communication.stream
    • +
  • pyDKB.dataflow.dkbID
  • pyDKB.dataflow.exceptions
    • -
  • pyDKB.dataflow.messages
    • -
  • pyDKB.dataflow.stage.AbstractProcessorStage
  • pyDKB.dataflow.stage.AbstractStage
    • -
  • pyDKB.dataflow.stage.processors
    • +
  • pyDKB.dataflow.stage.ProcessorStage
    • diff --git a/Docs/build/html/_modules/pyDKB/common/hdfs.html b/Docs/build/html/_modules/pyDKB/common/hdfs.html index 20fcf2070..ca01c2323 100644 --- a/Docs/build/html/_modules/pyDKB/common/hdfs.html +++ b/Docs/build/html/_modules/pyDKB/common/hdfs.html @@ -40,6 +40,8 @@

    Source code for pyDKB.common.hdfs

     import subprocess
 import select
 import os
+import posixpath as path
+import tempfile
 
 from . import HDFSException
 
@@ -103,13 +105,24 @@ 
    Source code for pyDKB.common.hdfs
                                 "Error message: %s\n" % (fname, err))
    
 
 
+
    [docs]def movefile(fname, dest):
+    """ Move local file to HDFS. """
+    if os.path.exists(fname):
+        putfile(fname, dest)
+        try:
+            os.remove(fname)
+        except OSError, err:
+            sys.stderr.write("(WARN) Failed to remove local copy of HDFS file"
+                             " (%s): %s" % (fname, err))
    
+
+
 
    [docs]def getfile(fname):
     """ Download file from HDFS.
 
     Return value: file name (without directory)
     """
     cmd = ["hadoop", "fs", "-get", fname]
-    name = os.path.basename(fname)
+    name = basename(fname)
     try:
         proc = subprocess.Popen(cmd,
                                 stdin=subprocess.PIPE,
@@ -124,6 +137,32 @@ 
    Source code for pyDKB.common.hdfs
         return name
    
 
 
+
    [docs]def File(fname):
+    """ Get and open temporary local copy of HDFS file
+
+    Return value: open file object (TemporaryFile).
+    """
+    cmd = ["hadoop", "fs", "-cat", fname]
+    tmp_file = tempfile.TemporaryFile()
+    try:
+        proc = subprocess.Popen(cmd,
+                                stdin=subprocess.PIPE,
+                                stderr=subprocess.PIPE,
+                                stdout=tmp_file)
+        check_stderr(proc)
+        tmp_file.seek(0)
+    except (subprocess.CalledProcessError, OSError), err:
+        if isinstance(err, subprocess.CalledProcessError):
+            err.cmd = ' '.join(cmd)
+        tmp_file.close()
+        raise HDFSException("Failed to get file from HDFS: %s\n"
+                            "Error message: %s\n" % (fname, err))
+    if tmp_file.closed:
+        return None
+
+    return tmp_file
    
+
+
 
    [docs]def listdir(dirname, mode='a'):
     """ List files and/or subdirectories of HDFS directory.
 
@@ -172,7 +211,7 @@ 
    Source code for pyDKB.common.hdfs
     
         # We need to return only the name of the file or subdir
         filename = line[7]
-        filename = os.path.basename(filename)
+        filename = basename(filename)
         if line[0][0] == 'd':
             subdirs.append(filename)
         elif line[0][0] == '-':
@@ -186,6 +225,29 @@ 
    Source code for pyDKB.common.hdfs
             result = subdirs
 
     return result
    
+
+
+
    [docs]def basename(path):
+    """ Return file name without path. """
+    if path is None:
+        path = ''
+    return path.basename(path).strip()
    
+
+
+
    [docs]def dirname(path):
+    """ Return dirname without filename. """
+    if path is None:
+        path = ''
+    return path.dirname(path).strip()
    
+
+
+
    [docs]def join(path, filename):
+    """ Join path and filename. """
+    if path is None:
+        path = ''
+    if filename is None:
+        filename = ''
+    return path.join(path, filename).strip()
    
 
    
 
           
    
diff --git a/Docs/build/html/_modules/pyDKB/dataflow/communication/consumer.html b/Docs/build/html/_modules/pyDKB/dataflow/communication/consumer.html
new file mode 100644
index 000000000..e9bbcc6b0
--- /dev/null
+++ b/Docs/build/html/_modules/pyDKB/dataflow/communication/consumer.html
@@ -0,0 +1,161 @@
+
+
+
+
+  
+    
+    
+    pyDKB.dataflow.communication.consumer — Data Knowledge Base  documentation
+    
+    
+    
+    
+    
+    
+    
+    
+   
+  
+  
+  
+  
+
+  
+  
+
+    
    
+      
    
+        
    
+          
+
+          
    
+            
+  
    Source code for pyDKB.dataflow.communication.consumer
    +"""
+Consumer submodule init file.
+"""
+
+from .. import messageType
+from .. import logLevel
+from .. import DataflowException
+
+from Consumer import Consumer
+from FileConsumer import FileConsumer
+from HDFSConsumer import HDFSConsumer
+from StreamConsumer import StreamConsumer
+
+__all__ = ['ConsumerBuilder']
+
+
+
    [docs]class ConsumerBuilder(object):
+    """ Constructor for Consumer instance. """
+
+    consumerClass = None
+
+    def __init__(self, config={}):
+        """ Constructor initialization. """
+        if not isinstance(config, dict):
+            raise TypeError("ConsumerBuilder expects argument of type 'dict'"
+                            " (got '%s')" % config.__class__.__name__)
+        self.config = config
+
+        if config.get('hdfs'):
+            self.setSource('h')
+        elif config.get('mode') in ('s', 'm'):
+            self.setSource('s')
+        else:
+            self.setSource(config.get('source'))
+
+
    [docs]    def setSource(self, source):
+        """ Set data source for the consumer. """
+        sources = {
+            'h': HDFSConsumer,
+            's': StreamConsumer,
+            'f': FileConsumer
+        }
+        if source not in sources:
+            raise ValueError("ConsumerBuilder.setSource() expects one of the"
+                             " following values: %s (got '%s')"
+                             % (sources.keys(), source))
+
+        self.consumerClass = sources[source]
+        return self
    
+
+
    [docs]    def setType(self, Type):
+        """ Set message type for the consumer. """
+        if Type is not None and not messageType.hasMember(Type):
+            raise ValueError("Unknown message type: %s" % Type)
+        self.message_type = Type
+        return self
    
+
+
    [docs]    def build(self, config={}):
+        """ Return constructed consumer. """
+        if not config:
+            config = self.config
+        instance = self.consumerClass(config)
+        if self.message_type:
+            instance.set_message_type(self.message_type)
+        return instance
    
+
    
+
+          
    
+          
+        
    
+      
    
+      
+      
    
+    
    
+    
    
+      ©2018, DKB team.
+      
+      |
+      Powered by Sphinx 1.7.6
+      & Alabaster 0.7.11
+      
+    
    
+
+    
+
+    
+  
+
\ No newline at end of file
diff --git a/Docs/build/html/_modules/pyDKB/dataflow/communication/consumer/Consumer.html b/Docs/build/html/_modules/pyDKB/dataflow/communication/consumer/Consumer.html
new file mode 100644
index 000000000..12bc0ba15
--- /dev/null
+++ b/Docs/build/html/_modules/pyDKB/dataflow/communication/consumer/Consumer.html
@@ -0,0 +1,234 @@
+
+
+
+
+  
+    
+    
+    pyDKB.dataflow.communication.consumer.Consumer — Data Knowledge Base  documentation
+    
+    
+    
+    
+    
+    
+    
+    
+   
+  
+  
+  
+  
+
+  
+  
+
+    
    
+      
    
+        
    
+          
+
+          
    
+            
+  
    Source code for pyDKB.dataflow.communication.consumer.Consumer
    +"""
+pyDKB.dataflow.communication.consumer.Consumer
+"""
+
+import sys
+from collections import defaultdict
+
+from . import messageType
+from . import logLevel
+from . import DataflowException
+
+from .. import Message
+from ..stream import StreamBuilder
+
+
+
    [docs]class ConsumerException(DataflowException):
+    """ Dataflow Consumer exception. """
+    pass
    
+
+
+
    [docs]class Consumer(object):
+    """ Data consumer implementation. """
+
+    config = None
+
+    message_type = None
+
+    _stream = None
+
+    def __init__(self, config={}):
+        """ Initialize Consumer instance. """
+        self.config = config
+        self.reconfigure()
+
+
    [docs]    def log(self, message, level=logLevel.INFO):
+        """ Output log message with given log level. """
+        if not logLevel.hasMember(level):
+            self.log("Unknown log level: %s" % level, logLevel.WARN)
+            level = logLevel.INFO
+        if type(message) == list:
+            lines = message
+        else:
+            lines = message.splitlines()
+        if lines:
+            out_message = "(%s) (%s) %s" % (logLevel.memberName(level),
+                                            self.__class__.__name__,
+                                            lines[0])
+            for l in lines[1:]:
+                out_message += "\n(==) %s" % l
+            out_message += "\n"
+            sys.stderr.write(out_message)
    
+
+    def __iter__(self):
+        """ Initialize iteration. """
+        return self
+
+
    [docs]    def reconfigure(self, config={}):
+        """ (Re)initialize consumer with stage config arguments. """
+        if config:
+            self.config = config
    
+
+
    [docs]    def init_stream(self):
+        """ Init input stream. """
+        src = self.get_source()
+        if src:
+            self._stream = \
+                StreamBuilder(src, self.config) \
+                .setStream('input') \
+                .setType(self.message_type) \
+                .build()
    
+
+
    [docs]    def get_stream(self):
+        """ Get input stream linked to the current source.
+
+        Return value:
+            InputStream
+            None (no sources left to read from)
+        """
+        if self.reset_stream():
+            result = self._stream
+        else:
+            result = None
+        return result
    
+
+
    [docs]    def reset_stream(self):
+        """ Reset input stream to the current source. """
+        src = self.get_source()
+        if src:
+            if not self._stream:
+                self.init_stream()
+            else:
+                self._stream.reset(src)
+        return src
    
+
+
    [docs]    def set_message_type(self, Type):
+        """ Set input message type. """
+        self.message_type = Type
+        stream = self.get_stream()
+        if stream:
+            stream.set_message_type(Type)
    
+
+
    [docs]    def message_class(self):
+        """ Return message class. """
+        return Message(self.message_type)
    
+
+
    [docs]    def get_source_info(self):
+        """ Return current source info. """
+        raise NotImplementedError
    
+
+
    [docs]    def get_message(self):
+        """ Get new message from current source.
+
+        Return values:
+            Message object
+            False (failed to parse message)
+            None  (all input sources are empty)
+        """
+        s = self.get_stream()
+        if not s:
+            msg = None
+        else:
+            msg = s.get_message()
+        return msg
    
+
+
    [docs]    def next(self):
+        """ Return new Message, read from input stream. """
+        msg = self.get_message()
+        if msg is None:
+            raise StopIteration
+        return msg
    
+
+
    [docs]    def close(self):
+        """ Close opened data stream and data source. """
+        for s in (self.get_stream(), self.get_source()):
+            if s and not getattr(s, 'closed', True):
+                s.close()
    
+
    
+
+          
    
+          
+        
    
+      
    
+      
+      
    
+    
    
+    
    
+      ©2018, DKB team.
+      
+      |
+      Powered by Sphinx 1.7.6
+      & Alabaster 0.7.11
+      
+    
    
+
+    
+
+    
+  
+
\ No newline at end of file
diff --git a/Docs/build/html/_modules/pyDKB/dataflow/communication/consumer/FileConsumer.html b/Docs/build/html/_modules/pyDKB/dataflow/communication/consumer/FileConsumer.html
new file mode 100644
index 000000000..a01cb0c80
--- /dev/null
+++ b/Docs/build/html/_modules/pyDKB/dataflow/communication/consumer/FileConsumer.html
@@ -0,0 +1,241 @@
+
+
+
+
+  
+    
+    
+    pyDKB.dataflow.communication.consumer.FileConsumer — Data Knowledge Base  documentation
+    
+    
+    
+    
+    
+    
+    
+    
+   
+  
+  
+  
+  
+
+  
+  
+
+    
    
+      
    
+        
    
+          
+
+          
    
+            
+  
    Source code for pyDKB.dataflow.communication.consumer.FileConsumer
    +"""
+pyDKB.dataflow.communication.consumer.FileConsumer
+
+Data consumer implementation for common (static) files.
+
+TODO: think about:
+      * updatable files
+      * pipes (better, from the point of StreamConsumer)
+      * round-robin (for updatable sources)
+      * ...
+"""
+
+import sys
+import os
+
+import Consumer
+from . import DataflowException
+from . import logLevel
+from .. import Message
+
+
+
    [docs]class FileConsumer(Consumer.Consumer):
+    """ Data consumer implementation for HDFS data source. """
+
+    # Current file
+    current_file = None
+
+    # Override
+
    [docs]    def reconfigure(self, config={}):
+        """ (Re)initialize consumer with Stage configuration. """
+        if not config:
+            config = self.config
+
+        if not self.config.get('input_dir'):
+            self.config['input_dir'] = os.path.curdir
+        self.input_files = None
+
+        super(FileConsumer, self).reconfigure(config)
    
+
+
    [docs]    def source_is_empty(self):
+        """ Check if current source is empty.
+
+        Return value:
+            True  (empty)
+            False (not empty)
+            None  (no source)
+        """
+        f = self.current_file
+        if not f:
+            return None
+        fd = f['fd']
+        if not f.get('size'):
+            stat = os.fstat(fd.fileno())
+            f['size'] = stat.st_size
+        return fd.tell() == f['size']
    
+
+
    [docs]    def get_source_info(self):
+        """ Return current source info. """
+        return self.current_file
    
+
+
    [docs]    def init_sources(self):
+        """ Initialize sources iterator if not initialized yet. """
+        if not self.input_files:
+            self.input_files = self._input_files()
    
+
+
    [docs]    def get_source(self):
+        """ Get nearest non-empty source (current or next). """
+        if self.source_is_empty() is not False:
+            result = self.next_source()
+        else:
+            result = self.current_file['fd']
+        return result
    
+
+
    [docs]    def next_source(self):
+        """ Reset $current_file to the next non-empty file.
+
+        Return value:
+            File descriptor of the new $current_file
+            None (no files left)
+        """
+        if not self.input_files:
+            self.init_sources()
+        try:
+            self.current_file = self.input_files.next()
+            result = self.get_source()
+        except StopIteration:
+            self.current_file = None
+            result = None
+        return result
    
+
+    def _filenames(self):
+        """ Return iterable object with filenames, taken from input. """
+        if self.config.get('input_files'):
+            files = self.config['input_files']
+        elif self.config.get('input_dir'):
+            files = self._filenames_from_dir(self.config['input_dir'])
+        else:
+            self.log("No input files configured; reading filenames from"
+                     " STDIN.", logLevel.WARN)
+            files = self._filenames_from_stdin()
+        return files
+
+    def _filenames_from_stdin(self):
+        """ Return iterable object, yielding filenames read from STDIN. """
+        return iter(sys.stdin.readline, "")
+
+    def _filenames_from_dir(self, dirname):
+        """ Return list of files in given local directory. """
+        files = []
+        ext = Message(self.message_type).extension()
+        try:
+            dir_content = os.listdir(dirname)
+            for f in dir_content:
+                if os.path.isfile(os.path.join(dirname, f)) \
+                        and f.lower().endswith(ext):
+                    files.append(f)
+                    yield f
+        except OSError, err:
+            raise Consumer.ConsumerException(err)
+
+    def _adjusted_filenames(self):
+        """ Return iterable object, yielding filename and path to file. """
+        for f in self._filenames():
+            d = {}
+            d['name'] = os.path.basename(f).strip()
+            d['dir'] = os.path.join(self.config.get('input_dir', '').strip(),
+                                    os.path.dirname(f).strip())
+            d['full_path'] = os.path.join(d['dir'], d['name'])
+            yield d
+
+    def _input_files(self):
+        """ Return iterable object, yielding dict with open file metadata.
+
+        Metadata include:
+          * fd        -- open file descriptor
+          * name      -- file name
+          * dir       -- directory name
+          * full_path -- full path to the file
+        """
+        input_files = self._adjusted_filenames()
+        for f in input_files:
+            with open(f['full_path'], 'r') as f['fd']:
+                yield f
    
+
    
+
+          
    
+          
+        
    
+      
    
+      
+      
    
+    
    
+    
    
+      ©2018, DKB team.
+      
+      |
+      Powered by Sphinx 1.7.6
+      & Alabaster 0.7.11
+      
+    
    
+
+    
+
+    
+  
+
\ No newline at end of file
diff --git a/Docs/build/html/_modules/pyDKB/dataflow/communication/consumer/HDFSConsumer.html b/Docs/build/html/_modules/pyDKB/dataflow/communication/consumer/HDFSConsumer.html
new file mode 100644
index 000000000..2088ff515
--- /dev/null
+++ b/Docs/build/html/_modules/pyDKB/dataflow/communication/consumer/HDFSConsumer.html
@@ -0,0 +1,175 @@
+
+
+
+
+  
+    
+    
+    pyDKB.dataflow.communication.consumer.HDFSConsumer — Data Knowledge Base  documentation
+    
+    
+    
+    
+    
+    
+    
+    
+   
+  
+  
+  
+  
+
+  
+  
+
+    
    
+      
    
+        
    
+          
+
+          
    
+            
+  
    Source code for pyDKB.dataflow.communication.consumer.HDFSConsumer
    +"""
+pyDKB.dataflow.communication.consumer.HDFSConsumer
+"""
+
+import sys
+
+import FileConsumer
+import Consumer
+from . import DataflowException
+from pyDKB.common import hdfs
+from pyDKB.common import HDFSException
+from . import logLevel
+
+
+
    [docs]class HDFSConsumer(FileConsumer.FileConsumer):
+    """ Data consumer implementation for HDFS data source. """
+
+    # Override
+
    [docs]    def reconfigure(self, config={}):
+        """ Configure HDFS Consumer according to the config parameters. """
+        if not config:
+            config = self.config
+
+        if not config.get('input_dir'):
+            config['input_dir'] = hdfs.DKB_HOME
+
+        super(HDFSConsumer, self).reconfigure(config)
    
+
+    # Override
+    def _filenames(self):
+        """ Return iterable object with filenames, taken from input. """
+        if self.config.get('mode') == 'm':
+            if self.config.get('input_files'):
+                self.log("Input file names are ignored in MapReduce mode.")
+                del self.config['input_files']
+            files = self._filenames_from_stdin()
+        else:
+            files = super(HDFSConsumer, self)._filenames()
+        return files
+
+    # Override
+    def _filenames_from_dir(self, dirname):
+        """ Return list of files in given HDFS directory.
+
+        Raises pyDKB.common.HDFSException
+        """
+        try:
+            files = hdfs.listdir(dirname, "f")
+        except HDFSException, err:
+            raise Consumer.ConsumerException(err)
+        return files
+
+    # Override
+    def _adjusted_filenames(self):
+        """ Return iterable object, yielding filename and path to file. """
+        for f in self._filenames():
+            d = {}
+            d['name'] = hdfs.basename(f)
+            d['dir'] = hdfs.join(self.config.get('input_dir', '').strip(),
+                                 hdfs.dirname(f))
+            d['full_path'] = hdfs.join(d['dir'], d['name'])
+            yield d
+
+    # Override
+    def _input_files(self):
+        """ Return iterable object, yielding dict with open file metadata.
+
+        Metadata include:
+          * fd        -- open file descriptor
+          * name      -- file name
+          * dir       -- HDFS directory name
+          * full_path -- full path to the file in HDFS
+        """
+        input_files = self._adjusted_filenames()
+        for f in input_files:
+            with hdfs.File(f['full_path']) as f['fd']:
+                yield f
    
+
    
+
+          
    
+          
+        
    
+      
    
+      
+      
    
+    
    
+    
    
+      ©2018, DKB team.
+      
+      |
+      Powered by Sphinx 1.7.6
+      & Alabaster 0.7.11
+      
+    
    
+
+    
+
+    
+  
+
\ No newline at end of file
diff --git a/Docs/build/html/_modules/pyDKB/dataflow/communication/consumer/StreamConsumer.html b/Docs/build/html/_modules/pyDKB/dataflow/communication/consumer/StreamConsumer.html
new file mode 100644
index 000000000..d17cff674
--- /dev/null
+++ b/Docs/build/html/_modules/pyDKB/dataflow/communication/consumer/StreamConsumer.html
@@ -0,0 +1,140 @@
+
+
+
+
+  
+    
+    
+    pyDKB.dataflow.communication.consumer.StreamConsumer — Data Knowledge Base  documentation
+    
+    
+    
+    
+    
+    
+    
+    
+   
+  
+  
+  
+  
+
+  
+  
+
+    
    
+      
    
+        
    
+          
+
+          
    
+            
+  
    Source code for pyDKB.dataflow.communication.consumer.StreamConsumer
    +"""
+pyDKB.dataflow.communication.consumer.StreamConsumer
+
+Data consumer implementation for a single stream.
+
+TODO: think about multiple streams (like a number of named
+      pipes, etc). Prehaps, even merge this class with FileConsumer.
+"""
+
+import sys
+import os
+
+import Consumer
+from . import DataflowException
+from . import logLevel
+
+
+
    [docs]class StreamConsumer(Consumer.Consumer):
+    """ Data consumer implementation for Stream data source. """
+
+    fd = None
+
+    # Override
+
    [docs]    def reconfigure(self, config={}):
+        """ (Re)configure Stream consumer. """
+        self.fd = sys.stdin
+        super(StreamConsumer, self).reconfigure(config)
    
+
+
    [docs]    def get_source_info(self):
+        """ Return current source info. """
+        return {'fd': self.fd}
    
+
+
    [docs]    def get_source(self):
+        """ Get Stream file descriptor. """
+        return self.fd
    
+
+
    [docs]    def next_source(self):
+        """ Return None.
+
+        As currenty we believe that there is only one input stream
+        """
+        return None
    
+
    
+
+          
    
+          
+        
    
+      
    
+      
+      
    
+    
    
+    
    
+      ©2018, DKB team.
+      
+      |
+      Powered by Sphinx 1.7.6
+      & Alabaster 0.7.11
+      
+    
    
+
+    
+
+    
+  
+
\ No newline at end of file
diff --git a/Docs/build/html/_modules/pyDKB/dataflow/messages.html b/Docs/build/html/_modules/pyDKB/dataflow/communication/messages.html
similarity index 74%
rename from Docs/build/html/_modules/pyDKB/dataflow/messages.html
rename to Docs/build/html/_modules/pyDKB/dataflow/communication/messages.html
index d1d02e31e..6f6aa449d 100644
--- a/Docs/build/html/_modules/pyDKB/dataflow/messages.html
+++ b/Docs/build/html/_modules/pyDKB/dataflow/communication/messages.html
@@ -6,17 +6,17 @@
   
     
     
-    pyDKB.dataflow.messages — Data Knowledge Base  documentation
-    
-    
-    
-    
-    
-    
-    
-    
+    pyDKB.dataflow.communication.messages — Data Knowledge Base  documentation
+    
+    
+    
+    
+    
+    
+    
+    
    
-  
+  
   
   
   
@@ -31,13 +31,15 @@
 
           
    
             
-  
    Source code for pyDKB.dataflow.messages
    +  
    Source code for pyDKB.dataflow.communication.messages
     """
+pyDKB.dataflow.communication.messages
+
 Definition of abstract message class and specific message classes
 """
 
 from . import messageType
-from pyDKB.dataflow.types import codeType
+from . import codeType
 
 import json
 import sys
@@ -45,7 +47,7 @@ 
    Source code for pyDKB.dataflow.messages
     __message_class = {}
 
 
-
    [docs]class DecodeUnknownType(NotImplementedError):
+
    [docs]class DecodeUnknownType(NotImplementedError):
     """ Exception to be thrown when message type is not decodable. """
     def __init__(self, code, cls):
         message = "%s can`t be decoded from %s" \
@@ -53,7 +55,7 @@ 
    Source code for pyDKB.dataflow.messages
             super(DecodeUnknownType, self).__init__(message)
    
 
 
-
    [docs]class EncodeUnknownType(NotImplementedError):
+
    [docs]class EncodeUnknownType(NotImplementedError):
     """ Exception to be thrown when message type is not encodable. """
     def __init__(self, code, cls):
         message = "%s can`t be encoded into %s" \
@@ -61,7 +63,7 @@ 
    Source code for pyDKB.dataflow.messages
             super(EncodeUnknownType, self).__init__(message)
    
 
 
-
    [docs]def Message(msg_type):
+
    [docs]def Message(msg_type):
     """ Return class XXXMessage, where XXX is the passed type. """
     if not messageType.hasMember(msg_type):
         raise ValueError("Message type must be a member of messageType")
@@ -75,7 +77,7 @@ 
    Source code for pyDKB.dataflow.messages
         return cls
    
 
 
-
    [docs]class AbstractMessage(object):
+
    [docs]class AbstractMessage(object):
     """ Abstract message """
 
     msg_type = None
@@ -92,47 +94,47 @@ 
    Source code for pyDKB.dataflow.messages
             if type(message) in self.native_types:
             self.decoded = message
 
-
    [docs]    def getOriginal(self):
+
    [docs]    def getOriginal(self):
         """ Return original message. """
         return self.__orig
    
 
-
    [docs]    def decode(self, code):
+
    [docs]    def decode(self, code):
         """ Decode original from CODE to TYPE-specific format.
 
         Raises ValueError
         """
         raise DecodeUnknownType(code, self.__class__)
    
 
-
    [docs]    def encode(self, code):
+
    [docs]    def encode(self, code):
         """ Encode original message from TYPE-specific format to CODE.
 
         Raises ValueError
         """
         raise EncodeUnknownType(code, self.__class__)
    
 
-
    [docs]    @classmethod
+
    [docs]    @classmethod
     def typeName(cls):
         """ Return message type name as string. """
         return messageType.memberName(cls.msg_type)
    
 
-
    [docs]    def content(self):
+
    [docs]    def content(self):
         """ Return message content. """
         return self.decode()
    
 
-
    [docs]    @classmethod
+
    [docs]    @classmethod
     def extension(cls):
         """ Return file extension corresponding this message type. """
         return cls._ext
    
 
 
-
    [docs]class JSONMessage(AbstractMessage):
+
    [docs]class JSONMessage(AbstractMessage):
     """ Message in JSON format. """
     msg_type = messageType.JSON
     native_types = [dict]
 
     _ext = ".json"
 
-
    [docs]    def decode(self, code=codeType.STRING):
+
    [docs]    def decode(self, code=codeType.STRING):
         """ Decode original data as JSON. """
         if not self.decoded:
             orig = self.getOriginal()
@@ -143,7 +145,7 @@ 
    Source code for pyDKB.dataflow.messages
                 self.encoded = orig
         return self.decoded
    
 
-
    [docs]    def encode(self, code=codeType.STRING):
+
    [docs]    def encode(self, code=codeType.STRING):
         """ Encode JSON as CODE. """
         if not self.encoded:
             orig = self.getOriginal()
@@ -158,7 +160,7 @@ 
    Source code for pyDKB.dataflow.messages
     __message_class[messageType.JSON] = JSONMessage
 
 
-
    [docs]class TTLMessage(AbstractMessage):
+
    [docs]class TTLMessage(AbstractMessage):
     """ Messages in TTL format
 
     Single message = single TTL statement
@@ -172,7 +174,7 @@ 
    Source code for pyDKB.dataflow.messages
     
     _ext = ".ttl"
 
-
    [docs]    def decode(self, code=codeType.STRING):
+
    [docs]    def decode(self, code=codeType.STRING):
         """ Decode original data as TTL.
 
         Currently takes text as it is.
@@ -187,8 +189,8 @@ 
    Source code for pyDKB.dataflow.messages
                 self.encoded = orig
         return self.decoded
    
 
-
    [docs]    def encode(self, code=codeType.STRING):
-        """ Encode JSON as CODE. """
+
    [docs]    def encode(self, code=codeType.STRING):
+        """ Encode TTL as CODE. """
         if not self.encoded:
             orig = self.getOriginal()
             if code == codeType.STRING:
@@ -208,7 +210,7 @@ 
    Source code for pyDKB.dataflow.messages