# DefaultBondStrategy

### Overview

`DefaultBondStrategy` defines the logic for managing bond-based strategies only focused on deposits and withdrawals. It allocates funds to different bonds in specified ratios and facilitates user withdrawals efficiently.

### Key Features

* **Bond Allocation**: Deposits into various bonds based on predefined ratios.
* **Withdrawal Management**: Supports instant user withdrawals by processing them through the `processWithdrawals` function.

### Error Definition

* **InvalidCumulativeRatio**: Raised in `setData` function when the cumulative ratio for bond allocations does not sum up correctly.

### Core Methods

1. **View Functions**
   * `Q96()`: Returns the constant `Q96` (2^96) for precise ratio calculations.
   * `vault()`: Returns the address of the associated vault.
   * `erc20TvlModule()`: Returns the address of the `ERC20TvlModule`.
   * `bondModule()`: Returns the address of the bond module managing transactions.
   * `tokenToData(address)`: Retrieves bond data associated with a specific token.
2. **Configuration Functions**
   * `setData(address, Data[])`: Sets bond allocation data for a given token. The cumulative ratio of all bonds must sum up to `Q96`.
3. **Withdrawal Functions**
   * `processAll()`: Processes all pending withdrawals for all users by withdrawing from bonds and through the vault, executing corresponding `Vault` function and depositing all tokens back into bonds according to ratios.
   * `processWithdrawals(address[])`: Processes withdrawals for a specific list of users.

### Data Structure

1. **Data**
   * **bond** (`address`): Address of the bond receiving the allocated funds.
   * **ratioX96** (`uint256`): Ratio of funds to allocate to this bond, with 96-bit precision.

### Events

1. **Bond Allocation Events:**
   * `DefaultBondStrategySetData(address, IDefaultBondStrategy.Data[], uint256)`: Emitted when bond allocation data is set for a specific token.
     * **token**: Address of the token associated with the bond data.
     * **data**: Array of `Data` structures representing the bond allocation.
     * **timestamp**: Timestamp when the data was set.
2. **Withdrawal Processing Events:**
   * `DefaultBondStrategyProcessWithdrawals(address[], uint256)`: Emitted when user withdrawals are processed.
     * **users**: Array of user addresses.
     * **timestamp**: Timestamp of the withdrawal processing.