hadoop ErasureCodec 源码
haddop ErasureCodec 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/codec/ErasureCodec.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.hadoop.io.erasurecode.codec;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.erasurecode.ECSchema;
import org.apache.hadoop.io.erasurecode.ErasureCodecOptions;
import org.apache.hadoop.io.erasurecode.ErasureCoderOptions;
import org.apache.hadoop.io.erasurecode.coder.ErasureDecoder;
import org.apache.hadoop.io.erasurecode.coder.ErasureEncoder;
import org.apache.hadoop.io.erasurecode.grouper.BlockGrouper;
/**
* Abstract Erasure Codec is defines the interface of each actual erasure
* codec classes.
*/
@InterfaceAudience.Private
public abstract class ErasureCodec {
private ECSchema schema;
private ErasureCodecOptions codecOptions;
private ErasureCoderOptions coderOptions;
public ErasureCodec(Configuration conf,
ErasureCodecOptions options) {
this.schema = options.getSchema();
this.codecOptions = options;
boolean allowChangeInputs = false;
this.coderOptions = new ErasureCoderOptions(schema.getNumDataUnits(),
schema.getNumParityUnits(), allowChangeInputs, false);
}
public String getName() {
return schema.getCodecName();
}
public ECSchema getSchema() {
return schema;
}
/**
* Get a {@link ErasureCodecOptions}.
* @return erasure codec options
*/
public ErasureCodecOptions getCodecOptions() {
return codecOptions;
}
protected void setCodecOptions(ErasureCodecOptions options) {
this.codecOptions = options;
this.schema = options.getSchema();
}
/**
* Get a {@link ErasureCoderOptions}.
* @return erasure coder options
*/
public ErasureCoderOptions getCoderOptions() {
return coderOptions;
}
protected void setCoderOptions(ErasureCoderOptions options) {
this.coderOptions = options;
}
public abstract ErasureEncoder createEncoder();
public abstract ErasureDecoder createDecoder();
public BlockGrouper createBlockGrouper() {
BlockGrouper blockGrouper = new BlockGrouper();
blockGrouper.setSchema(getSchema());
return blockGrouper;
}
}
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