add tutorial of using cobrarrow matlab api

cobrarrow/COBRArrow_Tutorial.m

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+%% COBRArrow Tutorial
+%  A tutorial for using the COBRArrow MATLAB API.
+
+%% Author: Yixing Lei
+
+%% INTRODUCTION
+%
+% COBRArrow is a tool designed to handle large-scale biochemical reaction 
+% models through remote procedure calls (RPC). It facilitates the sharing 
+% of computational models within COBRA tools across different programming 
+% languages and provides efficient optimization services, streamlining the 
+% process of sharing and optimizing various models.
+%
+% In this tutorial, you will learn how to use COBRArrow MATLAB API to:
+% - Set up the COBRArrow environment
+% - Send models to a remote server
+% - Fetch models from the server
+% - Persist models to a database
+% - Optimize models and retrieve results
+
+%% Step 1: Environment Setup
+%
+% Before you begin, ensure that you have installed the necessary 
+% dependencies:
+% - MATLAB with the COBRA Toolbox installed and initialized.
+% - Python: A compatible version of Python as specified by MathWorks 
+% Python Compatibility:
+%   https://www.mathworks.com/content/dam/mathworks/mathworks-dot-com/support/sysreq/files/python-support.pdf
+
+%% Step 2: Setting Up COBRArrow
+%
+% Before running any model, you need to set up COBRArrow in MATLAB. 
+% This involves initializing the environment and establishing a connection 
+% to the remote server.
+
+% Initialize COBRArrow
+initCobrarrow();
+
+% Build the service connection
+client = COBRArrow('cobrarrow.chatimd.org');
+
+% Login to use the service
+client = client.login('johndoe','123456');
+
+%% Step 3: Sending and Optimizing a Model
+%
+% COBRArrow allows you to send your biochemical model to a remote server, 
+% where you can run optimizations using remote resources, providing a faster 
+% and more efficient way of computation.
+
+% Example: Sending a Model
+% First, load your model and send it to the remote server:
+
+% Load the model(we use ecoli_core_model for demonstration purpose)
+fileName = 'ecoli_core_model.mat';
+if ~exist('modelOri','var')
+    modelOri = readCbModel(fileName);
+end
+
+% Send the model to the server
+schemaName = 'ecoli_core';
+client.sendModel(modelOri, schemaName);
+
+% schemaName is the unique identifier of the model on the server.
+% If the model with the same schemaName already exists on server, error
+% will be thrown. If you want to overwrite the existing model, set the 
+% toOverwrite flag to ture to the method call. Or you can choose to change
+% the schemaName.
+
+% Send the model to the server with flags for persistence and overwrite
+toPersist = false;        % Persist the model in the database
+toOverwrite = true;      % Overwrite the model on the server if it exists
+client.sendModel(modelOri, schemaName, toPersist, toOverwrite);
+
+% or you can just call sendModel method like this:
+client.sendModel(modelOri, schemaName, false, true);
+
+% Example: Optimizing a Model
+% Once the model is on the server, you can run optimization on the server. 
+
+% Specify the solver and parameters
+solver = COBRArrowSolver('gurobi');
+solver.setParameter('tol', 1e-9); 
+% Note: currently the remote optimization service hasn't supported 
+% parameter change yet
+
+% Run optimization
+result = client.optimizeModel(schemaName, solver);
+
+%% Additional Methods: Fetching and Persisting Models
+%
+% 1. Fetching the Model
+%
+% You can fetch a model that was uploaded by other users. The model can be
+% used in COBRA Toolbox for furthur analysis.
+fetchedModel = client.fetchModel(schemaName);
+
+% For example, it can be used to do optimization locally.
+solution = optimizeCbModel(fetchedModel);
+
+% 2. Persisting the Model to a Database
+%
+% Models sent to the remote server are stored in memory, which facilitates 
+% fast data sharing. However, this data is volatile and may be lost if the 
+% server is abruptly terminated. 
+
+% To avoid losing data, it's important to persist the model to a database:
+client.persistModel(schemaName, true);
+
+% 3. Send a field
+%
+% You can send an individual field to server.
+% For example, the flux result can be sent to server for visualization in 
+% Escher map.
+fieldName = 'flux';
+fieldData = result.flux;
+client.sendField(schemaName, fieldName, fieldData);
+
+% If the field is already stored on the server, error will be thrown. You
+% need to set the toOverwrite flag as true to overwrite the data.
+client.sendField(schemaName, fieldName, fieldData, true);
+
+% 4. Fetch a single field.
+%
+% You can fetch a single field in the model from the server. This provides
+% efficiency and convenience when you only need part of the data in the 
+% model for analysis.
+fluxResult = client.fetchField(schemaName, fieldName);
+
+% 5. Fetch the model for FBA analysis
+% 
+% You can fetch part of the model which includes the fields that are used
+% for doing FBA analysis only.
+FBAmodel = client.fetchModelForFBAAnalysis(schemaName);
+FBAresult = optimizeCbModel(FBAmodel);
+
+% 6. List flight information on the server
+%
+% The model sent to the server is stored as many flights. Every flight 
+% contains information about how each field is stored on the server. It
+% includes:
+% - descriptor: Unique identifier for the flight.
+% - total_records: Total number of records in the flight.
+% - total_bytes: Total number of bytes in the flight.
+% - endpoints: List of endpoints where the flight can be accessed.
+% - schema: Schema of the flight, including column names and data types.
+% - schema_metadata: Additional metadata associated with the schema, such 
+% as field name, description, dimension of the field and the data type of 
+% the field in matlab.
+
+% List flights in a schema
+flightsList = client.listAllFlights(schemaName);
+
+% List all flights on server
+allFlightsList = client.listAllFlights();
+
+ % 7. Get unique identifier of the flights
+ %
+ %  Get unique identifiers of the flights in a schema, so that we can
+ %  retrieve the flight and get the data.
+ descriptors = client.getAllDescriptors(schemaName);
+
+ %  Get all unique identifiers of the flights on the server
+ allDescriptors = client.getAllDescriptors();
+
+%% _TROUBLESHOOTING_
+%
+% If you encounter issues with sending models or running optimizations, ensure:
+% 1. The COBRA Toolbox and dependencies are correctly installed and configured.
+% 2. The server is accessible and running the necessary services.
+% 3. Python and required package (PyArrow) is correctly installed.
+%
+%
+%% _Acknowledgments_
+%
+% 1. Currently, the remote optimization service supports solvers including:
+% CPLEX, GLPK, Gurobi. It hasn't supported parameter change yet.
+% 2. Always persist your model to the database to avoid losing your data in 
+% case of a service shutdown.
+% 3. The listAllFlights method and getAllDescriptors method can be used for
+% debugging and future extension purposes, they are not involved in general
+% use cases.
+%
+%