# Message Sender Adapters

The `IMessageSenderAdapter` provides a sender adapter contract that connects `MultiBridgeMessageSender` with each AMB endpoint.

### IMessageSenderAdapter

The `IMessageSenderAdapter` extends the `SingleMessageDispatcher` interface (EIP-5164 standard) and defines the following functions:

#### name

This function returns the name of the message bridge.

```solidity
function name() external view returns (string memory);
```

#### updateReceiverAdapter

This function is used to update the address of the receiver adapter on a destination chain.

<pre class="language-solidity"><code class="lang-solidity"><strong>function updateReceiverAdapter(uint256[] calldata _dstChainIds, address[] calldata _receiverAdapters) external;
</strong></code></pre>

#### receiverAdapters

This function is used to retrieve the receiver adapter address for a given destination chain ID.

```solidity
function receiverAdapters(uint256 _chainId) external view returns (address);
```

The interface defines the following event:

#### ReceiverAdapterUpdated

```solidity
event ReceiverAdapterUpdated(uint256 indexed dstChainId, address indexed oldReceiver, address indexed newReceiver);
```

Emitted when the sender's corresponding receiver adapter on a destination chain is changed through the `updateReceiverAdapter()` function.

### SingleMessageDispatcher

```solidity
interface SingleMessageDispatcher is MessageDispatcher
```

The `SingleMessageDispatcher` interface extends the `MessageDispatcher` interface and defines an additional method, `dispatchMessage()`

```solidity
function dispatchMessage(
    uint256 _toChainId,
    address _to,
    bytes calldata _data
) external payable returns (bytes32 messageId);
```

`dispatchMessage()` dispatches an individual message to be executed on the `toChainId`.&#x20;

### MessageDispatcher

`MessageDispatcher` interface defines the following event:

```solidity
event MessageDispatched(
    bytes32 indexed _messageId,
    address indexed _from,
    uint256 indexed _toChainId,
    address _to,
    bytes _data
);
```

This event is emitted by a`MessageDispatcher` contract when an individual message is dispatched. It includes the following parameters:

* `_messageId`: A bytes32 value representing the unique identifier for the message.
* `_from`: The address of the sender of the message.
* `_toChainId`: A uint256 value representing the chain ID of the chain where the message is being dispatched.
* `_to`: The address of the recipient of the message.
* `_data`: The data of the message being dispatched.