# Aggregator Operation
### **Aggregator Initialization**
When the [Aggregator](https://github.com/soroswap/aggregator/) contract is deployed, the user who initializes it becomes the protocol administrator. During initialization, compatible underlying protocols are registered in the contract's storage, as shown in Figure 1.
Figure 1: Aggregator initialize function operations diagram.
### **Token Swap Process**
The Aggregator facilitates token swaps through two primary functions:
* **`swap_exact_tokens_for_tokens (when you want to have an exact input)`**
* **`swap_tokens_for_exact_tokens (when you want ot have an exact output)`**
These functions require users to specify:
* The input token (`token_in`).
* The output token (`token_out`).
* The amounts involved.
* A distribution vector (`DexDistribution`).
This vector contains information on how the swap should be split across different protocols and the paths to be followed for the operation.
### **Distribution Calculation**
To calculate the amounts to be swapped in each protocol, the **`calculate_distribution_amounts`** function is used. The mathematical formula applied is:
$$
\text{amount}\_i = \left\lfloor \frac{\text{total\_amount} \times \text{dist}\_i.\text{parts}}{\text{total\_parts}} \right\rfloor ; \quad \forall i \in Z \text{ s.t. } 1 \leq i < n
$$
This formula calculates the amount to be swapped for each protocol (i), where:
* `total_amount` is the total amount to be swapped.
* `total_parts` is the sum of all parts specified in `DexDistribution`.
$$
(\text{dist}\_i.\text{parts}) is the fraction assigned to protocol (i).
$$
$$
(Z) represents the set of integers, and (1 \leq i < n) specifies
$$
$$
that (i) is within the range of protocols involved in the swap.
$$
This formula ensures that the total amount to be swapped is correctly distributed among the selected protocols.
### **Administrative Functions**
The Aggregator includes administrative functions that allow management of the contract, such as:
* Initializing the contract.
* Registering, pausing, and removing protocols.
* Modifying the administrator address.
These functions ensure that the administrator has control over the protocols used in swaps and that only trusted protocols are utilized.
### **Adapter Interface and Protocols**
The Aggregator communicates with protocols via adapters, which implement the **`SoroswapAggregatorAdapterTrait`** interface. This interface defines standard functions such as:
* **`initialize`**: Sets up the adapter with necessary information.
* **`swap_exact_tokens_for_tokens`**: Executes swaps specifying the minimum token amounts.
* **`swap_tokens_for_exact_tokens`**: Executes swaps specifying the maximum input tokens.
Each adapter handles the specifics of its respective protocol, as shown in **Figure 3**.
Figure 3: Adapter swap functions and data fetchers diagram.
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