# Directory Leasing Feature - Detailed Design Document

## 1. Overview

Directory leasing extends the SMB3 lease concept to directories, enabling client-side caching of directory metadata and change notifications. This significantly improves performance for applications that frequently enumerate directories or monitor directory changes.

## 2. Protocol Specification Reference

- **MS-SMB2 Section 2.2.13.2.12**: SMB2_CREATE_REQUEST_LEASE_V2 for directories

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The `prefix`, `tags`, `responses`, and `dependencies` parameters are (as in many other cases) just a feature from **FastAPI** to help you avoid code duplication.

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### Import the dependencies { #import-the-dependencies }

This code lives in the module `app.routers.items`, the file `app/routers/items.py`.

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                    e.getMessage().contains("userDict") || e.getMessage().contains("Failed to write"));
        } finally {
            // Ensure proper cleanup
            if (updater != null) {
                try {
                    updater.close();
                } catch (Exception e) {
                    // Ignore cleanup exceptions in test

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* Introducing ScheduledJobs as described in [the proposal](docs/proposals/scheduledjob.md) as part of `batch/v2alpha1` version (experimental feature). ([#24970](https://github.com/kubernetes/kubernetes/pull/24970), [@soltysh](https://github.com/soltysh))

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    }
  }

  // Instance stuff here

  // The array is never mutated after storing in this field and the construction strategies ensure
  // it doesn't escape this class
  @SuppressWarnings("Immutable")
  private final long[] array;

  /*
   * TODO(kevinb): evaluate the trade-offs of going bimorphic to save these two fields from most

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        return null;
      }
      return capture(type);
    }
  }

  /**
   * Wraps around {@code TypeVariable<?>} to ensure that any two type variables are equal as long as
   * they are declared by the same {@link java.lang.reflect.GenericDeclaration} and have the same
   * name, even if their bounds differ.
   *

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    }
  }

  // Instance stuff here

  // The array is never mutated after storing in this field and the construction strategies ensure
  // it doesn't escape this class
  @SuppressWarnings("Immutable")
  private final int[] array;

  /*
   * TODO(kevinb): evaluate the trade-offs of going bimorphic to save these two fields from most

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        @Test
        @DisplayName("Should align size to 8-byte boundary")
        void testSizeAlignment() {
            // Test various data lengths to ensure 8-byte alignment
            for (int i = 0; i < 16; i++) {
                request.setData(new byte[i], 0, i);
                int size = request.size();