"github.com/smallnest/ringbuffer"
)

func main() {
	rb := ringbuffer.New(1024)

	// write
	rb.Write([]byte("abcd"))
	fmt.Println(rb.Length())
	fmt.Println(rb.Free())

	// read
	buf := make([]byte, 4)
	rb.Read(buf)
	fmt.Println(string(buf))
}
```

It is possible to use an existing buffer with by replacing `New` with `NewBuffer`.


# Blocking vs Non-blocking

                    .map(e -> new Pair<>(e.getKey(), (String) e.getValue())).collect(Collectors.toMap(Pair::getFirst, Pair::getSecond)));
            return result;
        } catch (InstantiationException | IllegalAccessException e) {
            final String msg = "Cannot create a new instance: " + entityType.getName();
            throw new IllegalBehaviorStateException(msg, e);
        }
    }

 * allowing dispatch to occur asynchronously.
 *
 * @author Cliff Biffle
 * @since 10.0
 */
@ElementTypesAreNonnullByDefault
public class AsyncEventBus extends EventBus {

  /**
   * Creates a new AsyncEventBus that will use {@code executor} to dispatch events. Assigns {@code
   * identifier} as the bus's name for logging purposes.
   *
   * @param identifier short name for the bus, for logging purposes.

    this.scenario = scenario;
    this.timeout = timeout;
    this.expectedOutcome = expectedOutcome;
    this.monitor = new Monitor(fair);
    this.guard = new FlagGuard(monitor);
    this.tearDownLatch = new CountDownLatch(1);
    this.doingCallLatch = new CountDownLatch(1);
    this.callCompletedLatch = new CountDownLatch(1);
  }

  private static String nameFor(

                }
                return new Pair<>(groupList.stream().distinct().toArray(n1 -> new String[n1]),
                        roleList.stream().distinct().toArray(n2 -> new String[n2]));
            });
        } catch (final ExecutionException e) {
            logger.warn("Failed to process a group cache.", e);
            return new Pair<>(StringUtil.EMPTY_STRINGS, StringUtil.EMPTY_STRINGS);
        }

    }

    private static Metadata createMetadata(Artifact artifact) {
        Snapshot snapshot = new Snapshot();
        snapshot.setLocalCopy(true);
        Versioning versioning = new Versioning();
        versioning.setSnapshot(snapshot);

        Metadata metadata = new Metadata();
        metadata.setVersioning(versioning);
        metadata.setGroupId(artifact.getGroupId());

    StringWriter writer = new StringWriter();
    char[] buf = new char[64];
    int read;
    while ((read = reader.read(buf)) != -1) {
      writer.write(buf, 0, read);
    }
    reader.close();
    writer.close();

    assertExpectedString(writer.toString());
  }

  public void testCopyTo_appendable() throws IOException {
    StringBuilder builder = new StringBuilder();

                try {
                    tempFile = File.createTempFile("ftp-", ".tmp");
                    try (OutputStream out = new BufferedOutputStream(new FileOutputStream(tempFile))) {
                        if (!client.retrieveFile(ftpInfo.getName(), out)) {
                            throw new CrawlingAccessException("Failed to retrieve: " + ftpInfo.toUrl());
                        }
                    }

      super(
          new UnhashableObject(1),
          new UnhashableObject(2),
          new UnhashableObject(3),
          new UnhashableObject(4),
          new UnhashableObject(5));
    }
  }

  public static class Colliders extends SampleElements<Object> {
    public Colliders() {
      super(new Collider(1), new Collider(2), new Collider(3), new Collider(4), new Collider(5));
    }
  }

    return new UncheckedThrowingFuture<V>();
  }

  public void complete(RuntimeException e) {
    if (!super.setException(new WrapperException(checkNotNull(e)))) {
      throw new IllegalStateException("Future was already complete: " + this);
    }
  }

  public void complete(Error e) {
    if (!super.setException(new WrapperException(checkNotNull(e)))) {