org.apache.flink.migration.state.MigrationStreamStateHandle 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.migration.state;
import org.apache.flink.annotation.Internal;
import org.apache.flink.core.fs.FSDataInputStream;
import org.apache.flink.core.fs.FSDataInputStreamWrapper;
import org.apache.flink.runtime.state.StreamStateHandle;
import org.apache.flink.util.Migration;
import java.io.IOException;
/**
* This class is just a StreamStateHandle that is tagged as migration, to figure out which restore logic to apply, e.g.
* when restoring backend data from a state handle.
*
* @deprecated Internal class for savepoint backwards compatibility. Don't use for other purposes.
*/
@Internal
@Deprecated
public class MigrationStreamStateHandle implements StreamStateHandle, Migration {
private static final long serialVersionUID = -2332113722532150112L;
private final StreamStateHandle delegate;
public MigrationStreamStateHandle(StreamStateHandle delegate) {
this.delegate = delegate;
}
@Override
public FSDataInputStream openInputStream() throws IOException {
return new MigrationFSInputStream(delegate.openInputStream());
}
@Override
public void discardState() throws Exception {
delegate.discardState();
}
@Override
public long getStateSize() {
return delegate.getStateSize();
}
static class MigrationFSInputStream extends FSDataInputStreamWrapper implements Migration {
public MigrationFSInputStream(FSDataInputStream inputStream) {
super(inputStream);
}
}
}