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# dmsfwk<a name="EN-US_TOPIC_0000001162308327"></a>
# Distributed Scheduler<a name="EN-US_TOPIC_0000001162308327"></a>
- [Introduction](#section11660541593)
- [System Architecture](#section13587185873516)
- [Directory Structure](#section161941989596)
- [Constraints](#section119744591305)
- [Usage](#section10729231131110)
- [Repositories Involved](#section1371113476307)
## Introduction<a name="section11660541593"></a>
The **dmsfwk** module provides URI capabilities for other OpenHarmony subsystems such as the application development framework \(including the ability framework and application framework\).
Distributed Scheduler is used for cross-device component management. It allows the local device to access or control remote components, and enables app collaboration in distributed scenarios. Its main functions are as follows:
- Remote FA startup: Starts a Feature Ability (FA) on a remote device.
- Remote FA migration: Migrates an FA to a remote device.
- Remote AA binding: Binds an AA on a remote device.
## System Architecture<a name="section13587185873516"></a>
![](figures/dms-architecture.png)
**Figure 1** Distributed Scheduler architecture<a name="fig4460722185514"></a>
## Directory Structure<a name="section161941989596"></a>
The main code directory structure of Distributed Scheduler is as follows:
```
/foundation/distributedschedule/dmsfwk/interfaces/innerkits/uri
/foundation/distributedschedule/dmsfwk
├── interfaces # API definition
├── services # Core functions
│ └── dtbschedmgr
│ ├── include
│ │ ├── ability_connection_wrapper_stub.h # Connection callback wrapper class
│ │ ├── adapter
│ │ │ └── dnetwork_adapter.h # DSoftBus adaptation layer
│ │ ├── bundle
│ │ │ └── bundle_manager_internal.h # BMS function wrapper class
│ │ ├── caller_info.h # Basic information about the caller
│ │ ├── connect_death_recipient.h # APIs that listen for connection callback death events
│ │ ├── continuation_callback_death_recipient.h # APIs that listen for continuation callback death events
│ │ ├── deviceManager
│ │ │ └── dms_device_info.h # APIs for defining and obtaining device information
│ │ ├── distributed_device_node_listener.h # APIs for listening for device online/offline events
│ │ ├── distributed_sched_ability_shell.h # Continuation callback management APIs
│ │ ├── distributed_sched_adapter.h # DMS adaptation layer
│ │ ├── distributed_sched_continuation.h # Continuation token management APIs
│ │ ├── distributed_sched_dumper.h # Dump APIs
│ │ ├── distributed_sched_interface.h # External APIs
│ │ ├── distributed_sched_permission.h # Permission verification APIs
│ │ ├── distributed_sched_proxy.h # Proxy APIs
│ │ ├── distributed_sched_service.h # Service APIs
│ │ ├── distributed_sched_stub.h # Stub APIs
│ │ ├── dtbschedmgr_device_info_storage.h # Device information storage management
│ │ ├── dtbschedmgr_log.h # Log module
│ │ ├── parcel_helper.h # Definition of auxiliary macros for serialization/deserialization
│ │ └── uri.h
│ ├── src
│ │ ├── ability_connection_wrapper_stub.cpp # Implementation of the connection callback wrapper class
│ │ ├── adapter
│ │ │ └── dnetwork_adapter.cpp # DSoftBus adaptation layer
│ │ ├── bundle
│ │ │ └── bundle_manager_internal.cpp # Implementation of the BMS function wrapper class
│ │ ├── connect_death_recipient.cpp # Implementation of the listening for connection callback death events
│ │ ├── continuation_callback_death_recipient.cpp # Implementation of the continuation callback death events
│ │ ├── deviceManager
│ │ │ └── dms_device_info.cpp # Implementation of the APIs for obtaining device information
│ │ ├── distributed_device_node_listener.cpp # Implementation of the APIs for device online/offline event listening
│ │ ├── distributed_sched_ability_shell.cpp # Implementation of continuation callback management
│ │ ├── distributed_sched_adapter.cpp # Implementation of the DMS adaptation layer
│ │ ├── distributed_sched_continuation.cpp # Implementation of continuation token management
│ │ ├── distributed_sched_dumper.cpp # Dump Implementation
│ │ ├── distributed_sched_permission.cpp # Permission verification implementation
│ │ ├── distributed_sched_proxy.cpp # Proxy implementation
│ │ ├── distributed_sched_service.cpp # Server implementation
│ │ ├── distributed_sched_stub.cpp # Stub implementation
│ │ └── dtbschedmgr_device_info_storage.cpp # Implementation of device information storage management
│ └──── BUILD.gn
├── sa_profile
├── utils
├── LICENSE
```
## Constraints<a name="section119744591305"></a>
- The devices between which you want to set up a connection must be in the same LAN.
- Before setting up a connection between two devices, you must bind the devices. For details about the binding process, see relevant descriptions in the Security subsystem readme file.
## Usage<a name="section10729231131110"></a>
- **Compiling and Building Distributed Scheduler**
The code of Distributed Scheduler is stored in the following directory:
```
foundation/distributedschedule/dmsfwk
```
## Repositories Involved<a name="section1371113476307"></a>
Distributed Scheduler subsystem
**distributedschedule\_dms\_fwk**
distributedschedule\_safwk
distributedschedule\_samgr
distributedschedule\_safwk\_lite
hdistributedschedule\_samgr\_lite
distributedschedule\_dms\_fwk\_lite
Distributed Scheduler
[distributedschedule\_dms\_fwk](https://https://gitee.com/openharmony/distributedschedule_dms_fwk)

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