org.apache.bookkeeper.client.LedgerMetadataUtils Maven / Gradle / Ivy
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* 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.bookkeeper.client;
import static com.google.common.base.Preconditions.checkArgument;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.SortedMap;
import org.apache.bookkeeper.client.api.LedgerMetadata;
import org.apache.bookkeeper.net.BookieId;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Utilities for working with ledger metadata.
*/
public class LedgerMetadataUtils {
static final Logger LOG = LoggerFactory.getLogger(LedgerMetadataUtils.class);
static List getCurrentEnsemble(LedgerMetadata metadata) {
return getLastEnsembleValue(metadata);
}
/**
* the entry id greater than the given entry-id at which the next ensemble change takes
* place.
*
* @param entryId
* @return the entry id of the next ensemble change (-1 if no further ensemble changes)
*/
static long getNextEnsembleChange(LedgerMetadata metadata, long entryId) {
SortedMap> tailMap = metadata.getAllEnsembles().tailMap(entryId + 1);
if (tailMap.isEmpty()) {
return -1;
} else {
return tailMap.firstKey();
}
}
static Set getBookiesInThisLedger(LedgerMetadata metadata) {
Set bookies = new HashSet();
for (List ensemble : metadata.getAllEnsembles().values()) {
bookies.addAll(ensemble);
}
return bookies;
}
static List getLastEnsembleValue(LedgerMetadata metadata) {
checkArgument(!metadata.getAllEnsembles().isEmpty(), "Metadata should never be created with no ensembles");
return metadata.getAllEnsembles().lastEntry().getValue();
}
static Long getLastEnsembleKey(LedgerMetadata metadata) {
checkArgument(!metadata.getAllEnsembles().isEmpty(), "Metadata should never be created with no ensembles");
return metadata.getAllEnsembles().lastKey();
}
public static boolean shouldStoreCtime(LedgerMetadata metadata) {
return metadata instanceof LedgerMetadataImpl && ((LedgerMetadataImpl) metadata).shouldStoreCtime();
}
}