public interface IEnterspeedContentHandlingGuard
{
    /// <summary>
    /// Validates if content can be ingested.
    /// </summary>
    /// <param name="content">Content for ingest.</param>
    /// <param name="culture">Culture of content.</param>
    /// <returns>True or false, if is valid for ingest or not.</returns>
    bool CanIngest(IPublishedContent content, string culture);
}

public class MyCustomerGuardsComposer : IComposer
{
    public void Compose(IUmbracoBuilder builder)
    {
        builder.EnterspeedContentHandlingGuards()
                .Append<MyCustomContentHandlingGuard>();
    }
}

[RuntimeLevel(MinLevel = RuntimeLevel.Run)]
public class MyCustomerGuardsComposer : IUserComposer
{
    public void Compose(Composition composition)
    {
        composition.EnterspeedContentHandlingGuards()
            .Append<MyCustomContentHandlingGuard>();
    }
}

public interface IEnterspeedDictionaryItemHandlingGuard
{
    /// <summary>
    /// Validates if dictionary item can be ingested.
    /// </summary>
    /// <param name="dictionaryItem">Dictionary item for ingest.</param>
    /// <param name="culture">Culture of dictionary item.</param>
    /// <returns>True or false, if is valid for ingest or not.</returns>
    bool CanIngest(IDictionaryItem dictionaryItem, string culture);
}

public class MyCustomerGuardsComposer : IComposer
{
    public void Compose(IUmbracoBuilder builder)
    {
        builder.EnterspeedDictionaryItemHandlingGuards()
                .Append<MyCustomDictionaryItemHandlingGuard>();
    }
}

[RuntimeLevel(MinLevel = RuntimeLevel.Run)]
public class MyCustomerGuardsComposer : IUserComposer
{
    public void Compose(Composition composition)
    {
        composition.EnterspeedDictionaryItemHandlingGuards()
            .Append<MyCustomDictionaryItemHandlingGuard>();
    }
}