content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.distributedlog.impl.logsegment;
  
  import com.google.common.collect.Lists;
  import java.util.List;
  import java.util.concurrent.CompletableFuture;
  import org.apache.bookkeeper.client.AsyncCallback;
  import org.apache.bookkeeper.client.BKException;
  import org.apache.bookkeeper.client.LedgerHandle;
  import org.apache.bookkeeper.common.concurrent.FutureUtils;
  import org.apache.distributedlog.common.functions.VoidFunctions;
  
  
  
  /**
   * BookKeeper Util Functions.
   */
  public class BKUtils {
  
      /**
       * Close a ledger <i>lh</i>.
       *
       * @param lh ledger handle
       * @return future represents close result.
       */
      public static CompletableFuture<Void> closeLedger(LedgerHandle lh) {
          final CompletableFuture<Void> closePromise = new CompletableFuture<Void>();
          lh.asyncClose(new AsyncCallback.CloseCallback() {
              @Override
              public void closeComplete(int rc, LedgerHandle lh, Object ctx) {
                  if (BKException.Code.OK != rc) {
                      FutureUtils.completeExceptionally(closePromise, BKException.create(rc));
                  } else {
                      FutureUtils.complete(closePromise, null);
                  }
              }
          }, null);
          return closePromise;
      }
  
      /**
       * Close a list of ledgers <i>lhs</i>.
       *
       * @param lhs a list of ledgers
       * @return future represents close results.
       */
      public static CompletableFuture<Void> closeLedgers(LedgerHandle ... lhs) {
          List<CompletableFuture<Void>> closeResults = Lists.newArrayListWithExpectedSize(lhs.length);
          for (LedgerHandle lh : lhs) {
              closeResults.add(closeLedger(lh));
          }
          return FutureUtils.collect(closeResults).thenApply(VoidFunctions.LIST_TO_VOID_FUNC);
      }
  
  }
  