org.apache.hudi.org.apache.hadoop.hbase.coprocessor.CoprocessorServiceBackwardCompatiblity Maven / Gradle / Ivy
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*
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* 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,
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*/
package org.apache.hadoop.hbase.coprocessor;
import com.google.protobuf.Service;
import org.apache.yetus.audience.InterfaceAudience;
import java.util.Collections;
/**
* Classes to help maintain backward compatibility with now deprecated {@link CoprocessorService}
* and {@link SingletonCoprocessorService}.
* From 2.0 onwards, implementors of coprocessor service should also implement the relevant
* coprocessor class (For eg {@link MasterCoprocessor} for coprocessor service in master), and
* override get*Service() method to return the {@link com.google.protobuf.Service} object.
* To maintain backward compatibility with 1.0 implementation, we'll wrap implementation of
* CoprocessorService/SingletonCoprocessorService in the new
* {Master, Region, RegionServer}Coprocessor class.
* Since there is no backward compatibility guarantee for Observers, we leave get*Observer() to
* default which returns null.
* This approach to maintain backward compatibility seems cleaner and more explicit.
*/
@InterfaceAudience.Private
@Deprecated
public class CoprocessorServiceBackwardCompatiblity {
static public class MasterCoprocessorService implements MasterCoprocessor {
CoprocessorService service;
public MasterCoprocessorService(CoprocessorService service) {
this.service = service;
}
@Override
public Iterable getServices() {
return Collections.singleton(service.getService());
}
}
static public class RegionCoprocessorService implements RegionCoprocessor {
CoprocessorService service;
public RegionCoprocessorService(CoprocessorService service) {
this.service = service;
}
@Override
public Iterable getServices() {
return Collections.singleton(service.getService());
}
}
static public class RegionServerCoprocessorService implements RegionServerCoprocessor {
SingletonCoprocessorService service;
public RegionServerCoprocessorService(SingletonCoprocessorService service) {
this.service = service;
}
@Override
public Iterable getServices() {
return Collections.singleton(service.getService());
}
}
}