feat: Added sample app for event based workflows

events/README.md

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+# 📨 Events App
+
+A simple application demonstrating how to build apps with the Atlan Application SDK using events.
+
+<img width="1505" alt="Screenshot 2025-06-18 at 1 42 09 PM" src="https://github.com/user-attachments/assets/e6bffb58-b305-4212-963c-d29d495c795b" />
+
+## Features
+- Simulates event-driven workflows
+- Real-time workflow status tracking
+- Integration with Temporal for workflow management
+- Demonstrates async and sync activities in a workflow
+- Example of basic workflow implementation
+
+## Usage
+
+> [!NOTE]
+> To run, first see the [main project README](../README.md) for prerequisites.
+
+### Run the Events Application
+
+```bash
+uv run main.py
+```
+
+### Access the Application
+
+Once the application is running:
+
+- **Temporal UI**: Access the Temporal Web UI at `http://localhost:8233` (or your Temporal UI address) to monitor workflow executions.
+- **Frontend**: Access the Frontend UI at `http://localhost:8000`
+
+To see the events flow - 
+1. Click "Start Workflow" on the frontend UI at `http://localhost:8000`
+2. Go to the temporal dashboard to see that a new workflow of the type `WorkflowTriggeredByUI` has started
+3. Wait for this workflow to finish, once finished, a new workflow will be triggered by the `workflow_end` event of this workflow of type `WorkflowTriggeredByEvent`
+
+![swimlanes-028e52a813253d7f59311fe0fb8b4af1](https://github.com/user-attachments/assets/3eb43edb-0b5a-4f0a-99e9-baab9ef111e1)
+
+## Development
+
+### Project Structure
+```
+.
+├── activities.py            # Workflow activities
+├── main.py                  # Application entry point
+├── workflows.py             # Workflow definitions
+├── subscriber_manifest.json # Subscriber manifest
+└── README.md                # This file
+```
+
+## Learning Resources
+- [Temporal Documentation](https://docs.temporal.io/)
+- [Atlan Application SDK Documentation](https://github.com/atlanhq/application-sdk/tree/main/docs)
+- [Python FastAPI Documentation](https://fastapi.tiangolo.com/)
+
+## Contributing
+We welcome contributions! Please feel free to submit a Pull Request.

events/activities.py

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+import asyncio
+
+from application_sdk.activities import ActivitiesInterface
+from application_sdk.observability.logger_adaptor import get_logger
+from temporalio import activity
+
+
+logger = get_logger(__name__)
+activity.logger = logger
+
+
+class SampleActivities(ActivitiesInterface):
+    @activity.defn
+    async def activity_1(self):
+        logger.info("Activity 1")
+
+        await asyncio.sleep(5)
+
+        return
+
+    @activity.defn
+    async def activity_2(self):
+        logger.info("Activity 2")
+
+        await asyncio.sleep(5)
+
+        return
+

events/frontend/static/styles.css

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+:root {
+    --primary-color: #FFD43B;
+    --primary-hover: #FCC419;
+    --background: #1E2124;
+    --card-bg: #2D3135;
+    --text-primary: #FFFFFF;
+    --text-secondary: #A1A1AA;
+    --border-color: #3F3F46;
+    --input-bg: #18191C;
+    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
+    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
+    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.2);
+    --transition: all 0.2s ease;
+  }
+
+  /* Base styles */
+  body {
+    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
+    background-color: var(--background);
+    margin: 0;
+    min-height: 100vh;
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    color: var(--text-primary);
+  }
+
+  /* Layout components */
+  .container {
+    background-color: var(--card-bg);
+    max-width: 600px;
+    width: 90%;
+    margin: 40px auto;
+    padding: 2.5rem;
+    border-radius: 24px;
+    box-shadow: var(--shadow-lg);
+  }
+
+  .header {
+    text-align: center;
+    margin-bottom: 2.5rem;
+  }
+
+  /* Typography */
+  h1 {
+    color: var(--primary-color);
+    font-size: 3rem;
+    margin-bottom: 0.5rem;
+    text-shadow: var(--shadow-sm);
+  }
+
+  .subtitle {
+    color: var(--text-secondary);
+    font-size: 1.2rem;
+    margin-bottom: 2rem;
+  }
+
+  /* Form elements */
+  .form-group {
+    margin-bottom: 2rem;
+  }
+
+  label {
+    display: block;
+    margin-bottom: 0.75rem;
+    font-weight: 600;
+    color: var(--text-primary);
+    font-size: 1.1rem;
+  }
+
+  input[type="text"] {
+    width: 100%;
+    padding: 1rem;
+    border: 2px solid var(--border-color);
+    border-radius: 12px;
+    font-size: 1rem;
+    transition: var(--transition);
+    background-color: var(--input-bg);
+    color: var(--text-primary);
+  }
+
+  input[type="text"]:focus {
+    outline: none;
+    border-color: var(--primary-color);
+    box-shadow: 0 0 0 4px rgba(255, 212, 59, 0.1);
+  }
+
+  .helper-text {
+    font-size: 0.9rem;
+    color: var(--text-secondary);
+    margin-top: 0.5rem;
+  }
+
+  button {
+    background-color: var(--primary-color);
+    color: var(--background);
+    border: none;
+    padding: 1rem 2rem;
+    border-radius: 12px;
+    cursor: pointer;
+    font-size: 1.1rem;
+    font-weight: 600;
+    width: 100%;
+    transition: var(--transition);
+  }
+
+  button:hover {
+    background-color: var(--primary-hover);
+    transform: translateY(-2px);
+    box-shadow: var(--shadow-md);
+  }
+
+  button:disabled {
+    opacity: 0.7;
+    cursor: not-allowed;
+  }
+
+  /* Modal */
+  .modal {
+    display: none;
+    position: fixed;
+    inset: 0;
+    background: rgba(0, 0, 0, 0.5);
+    backdrop-filter: blur(5px);
+    z-index: 1000;
+    justify-content: center;
+    align-items: center;
+  }
+
+  .modal.show {
+    display: flex;
+  }
+
+  .modal-content {
+    background: #2D3135;
+    padding: 2.5rem;
+    border-radius: 16px;
+    text-align: center;
+    max-width: 360px;
+    width: 90%;
+  }
+
+  .success-icon {
+    background-color: var(--primary-color);
+    width: 48px;
+    height: 48px;
+    border-radius: 50%;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    margin: 0 auto 1.5rem;
+  }
+
+  .success-icon svg {
+    width: 24px;
+    height: 24px;
+    color: var(--background);
+  }
+
+  .modal h2 {
+    color: var(--text-primary);
+    font-size: 1.5rem;
+    margin: 0 0 0.5rem;
+    font-weight: 600;
+  }
+
+  .modal p {
+    color: var(--text-secondary);
+    font-size: 1rem;
+    margin: 0 0 1.5rem;
+  }
+
+  .view-status-link {
+    color: #A78BFA;  /* Light purple color */
+    text-decoration: none;
+    font-size: 0.95rem;
+    font-weight: 500;
+    padding: 0.5rem 1rem;
+    border-radius: 8px;
+    transition: all 0.2s ease;
+    display: inline-flex;
+    align-items: center;
+    gap: 6px;
+  }
+
+  .view-status-link:hover {
+    background: rgba(167, 139, 250, 0.1);
+    transform: translateY(-1px);
+  }
+
+  .sparkle-icon {
+    font-size: 1.1em;
+    margin-left: 2px;
+  }
+
+  .btn-primary {
+    display: inline-block;
+    text-decoration: none;
+  }

events/frontend/templates/index.html

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+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Trigger Workflow</title>
+    <style>
+      body {
+        display: flex;
+        flex-direction: column;
+        align-items: center;
+        justify-content: center;
+        height: 100vh;
+        margin: 0;
+        background: #f7f9fb;
+        font-family: Arial, sans-serif;
+      }
+      h1 {
+        font-size: 2rem;
+        margin-bottom: 2rem;
+        color: #222;
+      }
+      .big-blue-btn {
+        padding: 1.2rem 3rem;
+        font-size: 1.3rem;
+        background: #2563eb;
+        color: #fff;
+        border: none;
+        border-radius: 8px;
+        cursor: pointer;
+        transition: background 0.2s;
+        box-shadow: 0 2px 8px rgba(37,99,235,0.08);
+      }
+      .big-blue-btn:hover {
+        background: #1d4ed8;
+      }
+    </style>
+  </head>
+  <body>
+    <h1>Start a workflow to trigger another one</h1>
+    <button class="big-blue-btn" onclick="startWorkflow()">Start Workflow</button>
+    <script>
+      function startWorkflow() {
+        fetch("/workflows/v1/start", {
+          method: 'POST',
+          headers: {
+            'Content-Type': 'application/json'
+          },
+          body: JSON.stringify({
+            search_term: 'test',
+            recipients: 'test'
+          })
+        })
+        .then(response => {
+          if (response.ok) {
+            alert('Workflow started!');
+          } else {
+            alert('Failed to start workflow.');
+          }
+        })
+        .catch(() => alert('Failed to start workflow.'));
+      }
+    </script>
+  </body>
+</html>