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using System;
using System.Threading;
using System.Threading.Tasks;
namespace Timeline.Services.Data
{
/// <summary>
/// A data manager controlling data.
/// </summary>
/// <remarks>
/// Identical data will be saved as one copy and return the same tag.
/// Every data has a ref count. When data is retained, ref count increase.
/// When data is freed, ref count decease. If ref count is decreased
/// to 0, the data entry will be destroyed and no longer occupy space.
/// </remarks>
public interface IDataManager
{
/// <summary>
/// Saves the data to a new entry if it does not exist,
/// increases its ref count and returns a tag to the entry.
/// </summary>
/// <param name="data">The data. Can't be null.</param>
/// <param name="cancellationToken">Cancellation token.</param>
/// <returns>The tag of the created entry.</returns>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="data"/> is null.</exception>
public Task<string> RetainEntryAsync(byte[] data, CancellationToken cancellationToken = default);
/// <summary>
/// Decrease the the ref count of the entry.
/// Remove it if ref count is zero.
/// </summary>
/// <param name="tag">The tag of the entry.</param>
/// <param name="cancellationToken">Cancellation token.</param>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="tag"/> is null.</exception>
/// <remarks>
/// It's no-op if entry with tag does not exist.
/// </remarks>
public Task FreeEntryAsync(string tag, CancellationToken cancellationToken = default);
/// <summary>
/// Retrieve the entry with given tag. If not exist, returns null.
/// </summary>
/// <param name="tag">The tag of the entry.</param>
/// <param name="cancellationToken">Cancellation token.</param>
/// <returns>The data of the entry. If not exist, returns null.</returns>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="tag"/> is null.</exception>
public Task<byte[]?> GetEntryAsync(string tag, CancellationToken cancellationToken = default);
}
}
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