import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;

/** Forwarding wrapper around a {@code Lock}. */
@J2ktIncompatible
@GwtIncompatible
abstract class ForwardingLock implements Lock {
  abstract Lock delegate();

  @Override
  public void lock() {
    delegate().lock();
  }

  @Override
  public void lockInterruptibly() throws InterruptedException {

func (b *Batch[I]) Add(item I) error {
	b.Lock()
	defer b.Unlock()

	if b.isFull() {
		if b.store == nil {
			return ErrBatchFull
		}
		// commit batch to store
		if err := b.commit(); err != nil {
			return err
		}
	}

	b.items = append(b.items, item)
	return nil
}

// Len returns the no of items in the batch
func (b *Batch[_]) Len() int {
	b.Lock()
	defer b.Unlock()

	return len(b.items)

				combineShared := combineSharedBlocks[block]
			nextAttempt:
				fmt.Printf("Block %d, Base version %q. Part %d. Files %d\n", block+1, key, part, len(file))
				m, err := readAndMap(file, part, block)
				if err != nil {
					return err
				}
				if exportedSizes[m.objSize] {
					fmt.Println("Skipping version", key, "as it has already been exported.")
					continue nextFile
				}
				addedFiles := 0

    }
  }

  /** A reference to a value. */
  interface ValueReference<K, V> {
    /** Returns the value. Does not block or throw exceptions. */
    @Nullable V get();

    /**
     * Waits for a value that may still be loading. Unlike get(), this method can block (in the case
     * of FutureValueReference).
     *
     * @throws ExecutionException if the loading thread throws an exception

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package lock

import (
	"os"
	"testing"
	"time"
)

// Test lock fails.
func TestLockFail(t *testing.T) {
	f, err := os.CreateTemp(t.TempDir(), "lock")
	if err != nil {
		t.Fatal(err)
	}
	f.Close()
	defer func() {
		err = os.Remove(f.Name())
		if err != nil {
			t.Fatal(err)

        setField(cmd, "timeout", 3000L);
        // arrays of one lock and one unlock range
        LockingAndXRange lock = new LockingAndXRange(false);
        lock.encode(new byte[20], 0); // initialise fields by encoding to set pid etc (though not needed)
        setField(lock, "pid", 123);
        setField(lock, "byteOffset", 100L);
        setField(lock, "lengthInBytes", 200L);
        LockingAndXRange unlock = new LockingAndXRange(false);

			buf.Reset()
			bytebufferpool.Put(buf)
		}()

		block := newMetacacheWriter(buf, 1<<20)
		defer block.Close()
		finishBlock := func() {
			if err := block.Close(); err != nil {
				w.streamErr = err
				return
			}
			current.data = buf.Bytes()
			w.streamErr = nextBlock(&current)
			// Prepare for next
			current.n++
			buf.Reset()
			block.Reset(buf)
			current.First = ""
		}

//     slots are used for object offloading or writing)
//
//   - <KbBlockSize>
//     Veeam Block Size for backup and restore processing before compression is applied. The higher the block size, the more
//     backup space is needed for incremental backups. Larger block sizes also mean less performance for random read restore

  }

  private fun logEvent(e: ConnectionEvent) {
    if (e.connection != null) {
      assertThat(Thread.holdsLock(e.connection), "Called with lock $${e.connection}")
        .isFalse()
    }
    for (lock in forbiddenLocks) {
      assertThat(Thread.holdsLock(lock), "Called with lock $lock")
        .isFalse()
    }

    if (enforceOrder) {
      checkForStartEvent(e)
    }

    eventSequence.offer(e)
  }

HTTP/1.1 503 Service Unavailable
Accept-Ranges: bytes
Content-Length: 0
Server: MinIO
Vary: Origin
X-Amz-Bucket-Region: us-east-1
X-Minio-Write-Quorum: 3
X-Amz-Request-Id: 16239D6AB80EBECF
X-Xss-Protection: 1; mode=block
Date: Tue, 21 Jul 2020 00:36:14 GMT
```

### Cluster-readable probe

The reply is '200 OK' if cluster has read quorum if not it returns '503 Service Unavailable'.

```