org.apache.flink.runtime.state.gemini.engine.page.DataPageUtil 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.runtime.state.gemini.engine.page;
import org.apache.flink.runtime.state.gemini.engine.fs.FileReader;
import org.apache.flink.runtime.state.gemini.engine.fs.FileWriter;
import org.apache.flink.runtime.state.gemini.engine.page.compress.GCompressAlgorithm;
import org.apache.flink.runtime.state.gemini.engine.rm.GByteBuffer;
import java.io.IOException;
/**
* DataPageUtil. be responsible for operator of logical page.
*/
public interface DataPageUtil {
/**
* Read the data from file.
* @param reader the reader.
* @param offsetInFile offset in file.
* @param pageAddress the page address of page data
* @return A GByteBuffer contains the data, reference counted.
*/
GByteBuffer getDataPageFromReader(FileReader reader, int offsetInFile, PageAddress pageAddress);
int write(
FileWriter writer,
GByteBuffer gByteBuffer,
PageAddress pageAddress,
GCompressAlgorithm gCompressAlgorithm,
int compressThreshold,
boolean checksumEnable) throws IOException;
}