kafka StandardAclRecordIterator 源码
kafka StandardAclRecordIterator 代码
文件路径：/metadata/src/main/java/org/apache/kafka/metadata/authorizer/StandardAclRecordIterator.java
/*
* 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.kafka.metadata.authorizer;
import org.apache.kafka.server.common.ApiMessageAndVersion;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
public class StandardAclRecordIterator implements Iterator<List<ApiMessageAndVersion>> {
private static final int DEFAULT_MAX_RECORDS_IN_BATCH = 10;
private final Iterator<StandardAclWithId> iterator;
private final int maxRecordsInBatch;
public StandardAclRecordIterator(Iterator<StandardAclWithId> iterator) {
this(iterator, DEFAULT_MAX_RECORDS_IN_BATCH);
}
public StandardAclRecordIterator(Iterator<StandardAclWithId> iterator, int maxRecordsInBatch) {
this.iterator = iterator;
this.maxRecordsInBatch = maxRecordsInBatch;
}
@Override
public boolean hasNext() {
return iterator.hasNext();
}
@Override
public List<ApiMessageAndVersion> next() {
if (!hasNext()) throw new NoSuchElementException();
List<ApiMessageAndVersion> result = new ArrayList<>(10);
for (int i = 0; i < maxRecordsInBatch; i++) {
if (!iterator.hasNext()) break;
StandardAclWithId aclWithId = iterator.next();
result.add(new ApiMessageAndVersion(aclWithId.toRecord(), (short) 0));
}
return result;
}
}
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