New Workshop with WMS ID#11824 (#82)

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coherence-demo/explore-clients/explore-clients.md

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+# Explore Python, JavaScript and Go Clients
+
+## Introduction
+
+This lab walks you through accessing Coherence from Python, JavaScript and Go clients.
+
+Coherence provides the ability for clients in various languages to connect to a cluster 
+using [gRPC](https://grpc.io/) as the network transport.
+
+For Java clients, connecting using gRPC provides an alternative to **Coherence*Extend** connections and can be advantageous when you need to connect through a load balancer as gRPC uses HTTP/2 under the covers and is more load balancer friendly.
+
+If you want to connect to Coherence from JavaScript, Python, or Go clients, then gRPC is the only protocol supported.
+
+For any of the language options, from a cluster perspective, you must include the **`coherence-grpc-proxy`** module, with which the server-side gRPC proxy will accept the gRPC connections and carry out work on behalf of the clients.       
+
+> Note: You can inspect the source code for each of the clients in the last lab.
+
+Estimated time: 10 minutes
+
+### Objectives
+
+In this lab, you will:
+
+* Use the Python client to monitor prices
+* Use the JavaScript client to add trades
+* Use the Go client to issue a stock-split
+
+### Prerequisites
+
+* You should have completed the previous labs.
+
+## Task 1: Monitor Prices Using Python
+
+> Note: Ensure you have enabled price updated in the primary cluster.
+
+1. Open a new terminal by using **`File`** -> **`New Tab`** in the existing terminal.
+
+   ![New Terminal](images/new-terminal.png "New Terminal")
+
+2. Change to the following directory:
+      ```bash
+      <copy>cd coherence-demo/clients/py</copy>
+      ```
+
+3. Run the python command to monitor prices:
+      ```bash
+      <copy>python3.8 main.py monitor</copy>
+      ```       
+
+   Because prices updates are still on via the dashboard, you should see the updates prices being displayed similar to below:
+
+      ```bash   
+      2024-11-25 09:08:49,674 - coherence - INFO - Session [ce32beb1-604e-49d3-bf00-b6d3b7f827a7] connected to [localhost:1408].
+      Listening for price changes. Press CTRL-C to finish.
+      Price changed for NFLX, new=$20.13, old=$20.11, change=$0.02  
+      Price changed for NFLX, new=$19.53, old=$20.13, change=$-0.60
+      Price changed for GOOG, new=$21.09, old=$21.13, change=$-0.04
+      Price changed for AAPL, new=$18.59, old=$19.30, change=$-0.71
+      ```
+
+## Task 2: Add Stocks using the JavaScript
+
+1. Open a new terminal by using **`File`** -> **`New Tab`** in the existing terminal.
+
+2. Change to the following directory:
+      ```bash
+      <copy>cd coherence-demo/clients/js</copy>
+      ```
+
+3. Issue the following to view the options applicable to the JavaScript client:
+      ```bash
+      <copy>node main.js</copy>
+      ```     
+
+   You should see output similar to the following:
+
+      ```bash
+      Usage: main.js command
+      The following commands are supported:
+      size        - display the cache sizes
+      monitor     - monitor prices
+      add-trades  - add random trades, specify symbol and count
+      stock-split - stock split, specify symbol and factor
+      ```                                                    
+
+      > Note: Each of the clients has the same command line arguments which allows us to see how Coherence is accessed from a variety of clients.
+
+4. Add 5,000 ORCL trades by issuing the following command:
+      ```bash
+      <copy>node main.js add-trades ORCL 5000</copy>
+      ``` 
+
+      You should see output similar to the following:
+
+      ```bash
+      2024-11-25 09:13:49,674: Adding 5000 random trades for ORCL...
+      2024-11-25 09:13:50,604: Trades cache size is now 111000
+      ```      
+
+      > Note: Confirm in the primary and secondary cluster dashboards that the trade count has increased for the `ORCL` stock.
+
+## Task 3: Issue a Stock Spit using Go
+
+1. Click on the checkbox next to  **`Real-time Price Updates`** to disable random stock price updates.
+
+2. Open a new terminal by using **`File`** -> **`New Tab`**  in the existing terminal.
+
+3. Change to the following directory:
+      ```bash
+      <copy>cd coherence-demo/clients/go</copy>
+      ```
+
+4. Create an Executable Go Binary using the following:
+      ```bash
+      <copy>go build -o go-demo .  
+      ls -l go-demo</copy>
+      ```
+
+      You should see output similar to the following:
+      ```bash
+      -rwxrwxr-x. 1 opc opc 17663730 Nov 25 01:23 go-demo
+      ```       
+
+5. Run the following to issue a **3:1** stock split for **`ORCL`** shares which will update the quantity by a factor of 3 and divide the price by a factor of 3.
+
+      ```bash
+      ./go-demo stock-split ORCL 3
+      2024/11/25 01:24:53 session: aacdcd08-01a8-4954-8bab-76123e45708f connected to address localhost:1408
+      2024/11/25 01:24:55 Updated quantity for 27622 trades
+      2024/11/25 01:24:56 Updated price for 27622 trades
+      2024/11/25 01:24:56 Updated price for ORCL from $22.21 to $7.40
+      ```
+
+      > Note: If you have time you can explore the three clients and run various commands in each of the clients.
+
+## Learn More
+
+* [Developing Remote Clients using gRPC](https://docs.oracle.com/en/middleware/standalone/coherence/14.1.2.0/develop-remote-clients/getting-started-grpc.html)
+* [Coherence Python Client](https://github.com/oracle/coherence-py-client)
+* [Coherence JavaScript Client](https://github.com/oracle/coherence-js-client)
+* [Coherence Go Client](https://github.com/oracle/coherence-go-client)
+
+## Acknowledgements
+
+* **Author** - Tim Middleton
+* **Contributors** - Ankit Pandey, Sid Joshi
+* **Last Updated By/Date** - Ankit Pandey, November 2024