org.apache.flink.table.runtime.util.BytesHashMapSpillMemorySegmentPool Maven / Gradle / Ivy
/*
* 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.flink.table.runtime.util;
import org.apache.flink.core.memory.MemorySegment;
import org.apache.flink.core.memory.MemorySegmentFactory;
import java.util.Collections;
import java.util.List;
/**
*/
public class BytesHashMapSpillMemorySegmentPool implements MemorySegmentPool {
private final List segments;
private final int pageSize;
private int allocated;
public BytesHashMapSpillMemorySegmentPool(int pageSize) {
this.segments = Collections.EMPTY_LIST;
this.pageSize = pageSize;
this.allocated = 0;
}
public BytesHashMapSpillMemorySegmentPool(List memorySegments) {
this.segments = memorySegments;
this.pageSize = memorySegments.get(0).size();
this.allocated = 0;
}
@Override
public MemorySegment nextSegment() {
allocated++;
if (allocated <= segments.size()) {
return segments.get(allocated - 1);
} else {
return MemorySegmentFactory.wrap(new byte[pageSize()]);
}
}
@Override
public void returnAll(List memory) {
throw new UnsupportedOperationException("not support!");
}
@Override
public int pageSize() {
return pageSize;
}
@Override
public void clear() {
allocated = 0;
}
}