/
NaturalLanguageProcess.cs
executable file
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/
NaturalLanguageProcess.cs
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/*
* Copyright (c) 2018 Samsung Electronics Co., Ltd All Rights Reserved
*
* Licensed under the Apache License, Version 2.0 (the License);
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
using System.Collections.Generic;
using System.Dynamic;
using System.Globalization;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Threading.Tasks;
using Tizen.Applications;
using Tizen.Applications.RPCPort;
namespace Tizen.Nlp
{
/// <summary>
/// This class contains the methods in the NLP processing.
/// </summary>
/// <since_tizen> 5 </since_tizen>
public class NaturalLanguageProcess : IDisposable
{
private Message _msg;
private Message.NotifyCb _noti = new Message.NotifyCb();
private const string ServiceId = "org.tizen.nlp.service";
private const string LogTag = "tizen.nlp.client";
private bool disposed = false;
private int _requestIdPos = 0;
private int _requestIdLang = 0;
private int _requestIdNeChunk = 0;
private int _requestIdWordTokenize = 0;
private Task _connectionTask;
private ConnectedState _connectionState = ConnectedState.Disconnected;
private readonly Dictionary<int, PostagCallback> _mapsPosTag = new Dictionary<int, PostagCallback>();
private readonly Dictionary<int, LangDetectCallback>
_mapsLangDetect = new Dictionary<int, LangDetectCallback>();
private readonly Dictionary<int, WordTokenizeCallback> _mapsWordTokenize =
new Dictionary<int, WordTokenizeCallback>();
private readonly Dictionary<int, NamedEntityRecognitionCallback> _mapsNamedEntity =
new Dictionary<int, NamedEntityRecognitionCallback>();
/// <summary>
/// An construct method to init local env of NLP .
/// </summary>
/// <since_tizen> 5 </since_tizen>
/// <feature>
/// http://tizen.org/feature/nlp
/// </feature>
/// <exception cref="NotSupportedException">The required feature is not supported.</exception>
public NaturalLanguageProcess()
{
_noti.Received += ResultReceived;
}
private delegate bool LangDetectCallback(MessageReceivedEventArgs e);
private delegate bool WordTokenizeCallback(MessageReceivedEventArgs e);
private delegate bool PostagCallback(MessageReceivedEventArgs e);
private delegate bool NamedEntityRecognitionCallback(MessageReceivedEventArgs e);
/// <summary>
/// A connection status change event
/// </summary>
/// <since_tizen> 5 </since_tizen>
public event EventHandler Disconnected;
private enum ConnectedState
{
Disconnected,
Connecting,
Connected
}
private void MakeRequest(string cmd, string sentence, int requestid)
{
if (_connectionState == ConnectedState.Connected)
{
using (Bundle b = new Bundle())
{
b.AddItem("command", cmd);
b.AddItem("info", sentence);
b.AddItem("request_id", requestid.ToString());
_msg.Send(b);
b.Dispose();
}
}
else if (_connectionState == ConnectedState.Connecting)
{
throw new InvalidOperationException("natural language service is connecting");
}
else
{
throw new InvalidOperationException("disconnected from natural language service");
}
}
private void ResultReceived(string sender, Bundle msg)
{
Log.Debug(LogTag, "OnReceived ");
MessageReceivedEventArgs e = new MessageReceivedEventArgs();
int requestid = 0;
Dictionary<string, string[]> result = new Dictionary<string, string[]>();
if (msg.Contains("return_token"))
result.Add("token", (string[])msg.GetItem("return_token"));
if (msg.Contains("request_id"))
e.RequestId = requestid = int.Parse((string)msg.GetItem("request_id"), NumberStyles.Integer, CultureInfo.InvariantCulture);
else
return;
if (msg.Contains("command"))
{
if (msg.GetItem("command").Equals("word_tokenize"))
{
e.Message = result;
if (_mapsWordTokenize.ContainsKey(requestid))
{
_mapsWordTokenize[requestid]?.Invoke(e);
_mapsWordTokenize.Remove(requestid);
}
}
else if (msg.GetItem("command").Equals("pos_tag"))
{
result.Add("tag", (string[])msg.GetItem("return_tag"));
e.Message = result;
if (_mapsPosTag.ContainsKey(requestid))
{
_mapsPosTag[requestid]?.Invoke(e);
_mapsPosTag.Remove(requestid);
}
}
else if (msg.GetItem("command").Equals("ne_chunk"))
{
result.Add("tag", (string[])msg.GetItem("return_tag"));
e.Message = result;
if (_mapsNamedEntity.ContainsKey(requestid))
{
_mapsNamedEntity[requestid]?.Invoke(e);
_mapsNamedEntity.Remove(requestid);
}
}
else if (msg.GetItem("command").Equals("langdetect"))
{
e.Message = result;
if (_mapsLangDetect.ContainsKey(requestid))
{
_mapsLangDetect[requestid]?.Invoke(e);
_mapsLangDetect.Remove(requestid);
}
}
}
}
/// <summary>
/// An async method to connect remote service.
/// </summary>
/// <since_tizen> 5 </since_tizen>
/// <returns>A task representing the asynchronous connect operation.</returns>
/// <exception cref="InvalidOperationException">Thrown when the connect is rejected.</exception>
public Task Connect()
{
if (_connectionState == ConnectedState.Connected)
{
return Task.CompletedTask;
}
else if (_connectionState == ConnectedState.Connecting)
{
return _connectionTask;
}
_connectionState = ConnectedState.Connecting;
TaskCompletionSource<bool> tcs = new TaskCompletionSource<bool>();
_msg = new Message(ServiceId);
_msg.Disconnected += (s, e) =>
{
_connectionState = ConnectedState.Disconnected;
Disconnected?.Invoke(this, e);
};
_msg.Connected += (sender, e) =>
{
Log.Debug(LogTag, "start to register");
try
{
_msg.CoRegister(Application.Current.ApplicationInfo.ApplicationId, _noti);
_connectionState = ConnectedState.Connected;
tcs.SetResult(true);
}
catch (InvalidIOException)
{
Log.Debug(LogTag, "Exception occurred while CoRegister");
_connectionState = ConnectedState.Disconnected;
tcs.SetException(new InvalidOperationException("invalid Port cause exception", new InvalidIOException()));
}
};
_msg.Rejected += (sender, e) =>
{
_connectionState = ConnectedState.Disconnected;
tcs.SetException(new InvalidOperationException("invalid id cause exception"));
};
_msg.Connect();
return _connectionTask = tcs.Task;
}
/// <summary>
/// A method to close message connection
/// </summary>
/// <since_tizen> 5 </since_tizen>
public void Close()
{
if (_connectionState == ConnectedState.Disconnected) return;
_msg.UnRegister();
_msg.Dispose();
_msg = null;
_connectionState = ConnectedState.Disconnected;
_connectionTask.Dispose();
_connectionTask = null;
}
private void MapClear()
{
_mapsWordTokenize.Clear();
_mapsPosTag.Clear();
_mapsNamedEntity.Clear();
_mapsLangDetect.Clear();
}
/// <summary>
/// A method to release resource of library
/// </summary>
/// <since_tizen> 5 </since_tizen>
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
/// <inheritdoc/>
protected virtual void Dispose(bool disposing)
{
if (disposed)
return;
if (disposing)
{
Close();
_noti.Received -= ResultReceived;
_noti = null;
MapClear();
}
disposed = true;
}
/// <summary>
/// Send Pos of Tag request to remote tidl service with one parameters.
/// </summary>
/// <param name="sentence">A sentence need to be processed.</param>
/// <returns>PosTagResult</returns>
/// <since_tizen> 5 </since_tizen>
public Task<PosTagResult> PosTagAsync(string sentence)
{
int id = _requestIdPos++;
MakeRequest("pos_tag", sentence, id);
var task = new TaskCompletionSource<PosTagResult>();
_mapsPosTag[id] = (e) =>
{
PosTagResult pr = new PosTagResult();
e.Message.TryGetValue("token", out string[] tokens);
e.Message.TryGetValue("tag", out string[] tags);
pr.Tokens = tokens;
pr.Tags = tags;
task.SetResult(pr);
return true;
};
return task.Task;
}
/// <summary>
/// Send Named Entity recognition request to remote tidl service with one parameters.
/// </summary>
/// <param name="sentence">A sentence need to be processed.</param>
/// <returns>NamedEntityRecognitionResult</returns>
/// <since_tizen> 5 </since_tizen>
public Task<NamedEntityRecognitionResult> NamedEntityRecognitionAsync(string sentence)
{
int id = _requestIdNeChunk++;
MakeRequest("ne_chunk", sentence, id);
var task = new TaskCompletionSource<NamedEntityRecognitionResult>();
_mapsNamedEntity[id] = (e) =>
{
NamedEntityRecognitionResult nr = new NamedEntityRecognitionResult();
e.Message.TryGetValue("token", out string[] tokens);
e.Message.TryGetValue("tag", out string[] tags);
nr.Tokens = tokens;
nr.Tags = tags;
task.SetResult(nr);
return true;
};
return task.Task;
}
/// <summary>
/// Send language detect request to remote tidl service with one parameters.
/// </summary>
/// <param name="sentence">A sentence need to be processed.</param>
/// <returns>LanguageDetectedResult</returns>
/// <since_tizen> 5 </since_tizen>
public Task<LanguageDetectedResult> LanguageDetectAsync(string sentence)
{
int id = _requestIdLang++;
MakeRequest("langdetect", sentence, id);
var task = new TaskCompletionSource<LanguageDetectedResult>();
_mapsLangDetect[id] = (e) =>
{
LanguageDetectedResult lr = new LanguageDetectedResult();
e.Message.TryGetValue("token", out string[] lang);
if (lang != null) lr.Language = lang[0];
task.SetResult(lr);
return true;
};
return task.Task;
}
/// <summary>
/// Send word tokenize request to remote tidl service with one parameters.
/// </summary>
/// <param name="sentence">A sentence need to be processed.</param>
/// <returns>ProcessResult</returns>
/// <since_tizen> 5 </since_tizen>
public Task<WordTokenizeResult> WordTokenizeAsync(string sentence)
{
int id = _requestIdWordTokenize++;
MakeRequest("word_tokenize", sentence, id);
var task = new TaskCompletionSource<WordTokenizeResult>();
_mapsWordTokenize[id] = (e) =>
{
WordTokenizeResult wr = new WordTokenizeResult();
e.Message.TryGetValue("token", out string[] tokens);
wr.Tokens = tokens;
task.SetResult(wr);
return true;
};
return task.Task;
}
}
}