spark DummySerializerInstance 源码
spark DummySerializerInstance 代码
文件路径：/core/src/main/java/org/apache/spark/serializer/DummySerializerInstance.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.spark.serializer;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import scala.reflect.ClassTag;
import org.apache.spark.annotation.Private;
import org.apache.spark.unsafe.Platform;
/**
* Unfortunately, we need a serializer instance in order to construct a DiskBlockObjectWriter.
* Our shuffle write path doesn't actually use this serializer (since we end up calling the
* `write() OutputStream methods), but DiskBlockObjectWriter still calls some methods on it. To work
* around this, we pass a dummy no-op serializer.
*/
@Private
public final class DummySerializerInstance extends SerializerInstance {
public static final DummySerializerInstance INSTANCE = new DummySerializerInstance();
private DummySerializerInstance() { }
@Override
public SerializationStream serializeStream(final OutputStream s) {
return new SerializationStream() {
@Override
public void flush() {
// Need to implement this because DiskObjectWriter uses it to flush the compression stream
try {
s.flush();
} catch (IOException e) {
Platform.throwException(e);
}
}
@Override
public <T> SerializationStream writeObject(T t, ClassTag<T> ev1) {
throw new UnsupportedOperationException();
}
@Override
public void close() {
// Need to implement this because DiskObjectWriter uses it to close the compression stream
try {
s.close();
} catch (IOException e) {
Platform.throwException(e);
}
}
};
}
@Override
public <T> ByteBuffer serialize(T t, ClassTag<T> ev1) {
throw new UnsupportedOperationException();
}
@Override
public DeserializationStream deserializeStream(InputStream s) {
throw new UnsupportedOperationException();
}
@Override
public <T> T deserialize(ByteBuffer bytes, ClassLoader loader, ClassTag<T> ev1) {
throw new UnsupportedOperationException();
}
@Override
public <T> T deserialize(ByteBuffer bytes, ClassTag<T> ev1) {
throw new UnsupportedOperationException();
}
}
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