dify/api/dify_graph/graph_engine/command_channels/README.md

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# Command Channels
Channel implementations for external workflow control.
## Components
### InMemoryChannel
Thread-safe in-memory queue for single-process deployments.
- `fetch_commands()` - Get pending commands
- `send_command()` - Add command to queue
### RedisChannel
Redis-based queue for distributed deployments.
- `fetch_commands()` - Get commands with JSON deserialization
- `send_command()` - Store commands with TTL
## Usage
```python
# Local execution
channel = InMemoryChannel()
channel.send_command(AbortCommand(graph_id="workflow-123"))
# Distributed execution
redis_channel = RedisChannel(
redis_client=redis_client,
channel_key="workflow:123:commands"
)
```