> For the complete documentation index, see [llms.txt](https://docs.mellow.finance/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.mellow.finance/resources/mellow-lrt-depreciated/oracles/managedratiosoracle.md).

# ManagedRatiosOracle

### Overview

The `ManagedRatiosOracle` contract provides ratio management for underlying tokens within a vault. It allows updating and retrieving target ratios for the vault's assets using a 96-bit fixed-point precision system.

### Key Features

* **Ratio Management**: Sets and retrieves target ratios for vault tokens.

### Error Definitions

* **InvalidLength**: Raised if the number of ratios doesn't match the number of underlying tokens or if data is absent.
* **InvalidToken**: The token hash does not match the stored ratios data hash.
* **InvalidCumulativeRatio**: The cumulative sum of ratios does not match the expected value.

### Constants

* **Q96**: Fixed-point scaling constant (2^96) used for precise ratio calculations.

### Methods:

1. **Ratio Management**
   * `updateRatios(address, bool, uint128[])`: Updates the target ratios for a specific vault.
     * **vault**: The address of the vault.
     * **isDeposit**: A boolean indicating whether the ratios are for a deposit or a withdrawal.
     * **ratiosX96**: An array of ratios, each with 96-bit precision.
     * **Errors**:
       * `InvalidLength`: The number of ratios does not match the number of tokens.
       * `InvalidCumulativeRatio`: Cumulative ratio sum does not match `Q96`.
   * `getTargetRatiosX96(address, bool)`: Retrieves the target ratios for a given vault.
     * **vault**: The address of the vault.
     * **isDeposit**: A boolean indicating whether the ratios are for a deposit or a withdrawal.
     * **Errors**:
       * `InvalidLength`: Data is missing.
       * `InvalidToken`: The stored token hash does not match the current hash.

**Data Structures**

* **Data**
  * **tokensHash** (`bytes32`): Keccak256 hash of the tokens array to ensure consistency.
  * **ratiosX96** (`uint128[]`): An array of ratios with 96-bit precision.

### Event

* `ManagedRatiosOracleUpdateRatios(address, bool, uint128[])`: Emitted when the target ratios are updated for a vault.
  * **vault**: The address of the vault.
  * **isDeposit**: A boolean indicating whether the ratios are for a deposit or a withdrawal.
  * **ratiosX96**: An array of updated target ratios.


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