* Alter context packet type
     */
    int RPC_PT_ALTER_CONTEXT = 0x0E;
    /**
     * Alter context response packet type
     */
    int RPC_PT_ALTER_CONTEXT_RESPONSE = 0x0F;
    /**
     * Shutdown packet type
     */
    int RPC_PT_SHUTDOWN = 0x11;
    /**
     * Cancel packet type
     */
    int RPC_PT_CANCEL = 0x12;
    /**
     * Acknowledgment packet type
     */

     */
    String getProviderName();
    
    /**
     * Get maximum message size supported
     */
    int getMaxMessageSize();
    
    /**
     * Clean up provider resources
     */
    void shutdown();
}

public enum RdmaAccess {
    LOCAL_READ,
    LOCAL_WRITE,
    REMOTE_READ,
    REMOTE_WRITE,
    MEMORY_BIND
}
```

## 4. Data Structures

### 4.1 RDMA Connection
```java

          }
        },
        exec);

    assertEquals(1, latch.getCount());
    assertFalse(future.isDone());
    assertFalse(future.isCancelled());
  }

  public void tearDown() {
    exec.shutdown();
  }

  public void testCompletedFuture(@Nullable Object expectedValue)
      throws InterruptedException, ExecutionException {
    assertTrue(future.isDone());
    assertFalse(future.isCancelled());

            listenerLatch.countDown();
          }
        },
        directExecutor());
  }

  @Override
  protected void tearDown() throws Exception {
    if (exec != null) {
      exec.shutdown();
    }

    super.tearDown();
  }

  public void testListenerDoesNotRunUntilTaskCompletes() throws Exception {

    // Test default state of not started.
    assertEquals(1, listenerLatch.getCount());

          .addAllowedQuicHost("www.google.com")
          .build(),
      ).addQuicHint("google.com", 443, 443)
      .addQuicHint("www.google.com", 443, 443)
      .build()

  @After
  fun tearDown() {
    engine.shutdown()
    cacheDir.deleteRecursively()
  }

  @Test
  fun get() {
    val executor = Executors.newCachedThreadPool()

    val completableFuture = execute(engine, executor, "https://google.com/robots.txt")

                    latch.countDown();
                }
            });
        }

        assertTrue(latch.await(10, TimeUnit.SECONDS), "Concurrent operations should complete");
        executor.shutdown();

        // Circuit breaker should have handled concurrent operations
        assertTrue(successCount.get() > 0, "Should have some successful operations");

            listenerLatch.countDown();
          }
        },
        directExecutor());
  }

  @Override
  protected void tearDown() throws Exception {
    if (exec != null) {
      exec.shutdown();
    }

    super.tearDown();
  }

  public void testListenerDoesNotRunUntilTaskCompletes() throws Exception {

    // Test default state of not started.
    assertEquals(1, listenerLatch.getCount());

        return "DiSNI (InfiniBand/RoCE)";
    }

    @Override
    public int getMaxMessageSize() {
        return 2147483647; // 2GB - DiSNI theoretical limit
    }

    @Override
    public void shutdown() {
        if (endpointGroup != null) {
            try {
                // In real implementation: endpointGroup.close();
                log.info("DiSNI RDMA provider shut down");
            } catch (Exception e) {

      }
      barrier.await(); // release the threads!
      barrier.await(); // wait for them all to complete
      assertEquals(1, task.get().intValue());
      assertEquals(1, counter.get());
    }
    executor.shutdown();
  }

  @J2ktIncompatible
  @GwtIncompatible // blocking wait
  public void testToString() throws Exception {
    CountDownLatch enterLatch = new CountDownLatch(1);

      ExecutionException e = assertThrows(ExecutionException.class, () -> f.get());
      assertThat(e).hasCauseThat().isInstanceOf(TimeoutException.class);
    } finally {
      executor.shutdown();
    }
  }