hugegraph-pd/hg-pd-service/src/main/java/org/apache/hugegraph/pd/pulse/PdInstructionSubject.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.hugegraph.pd.pulse;

import java.util.function.Function;

import org.apache.hugegraph.pd.grpc.pulse.PdInstructionResponse;
import org.apache.hugegraph.pd.grpc.pulse.PulseNoticeRequest;
import org.apache.hugegraph.pd.grpc.pulse.PulseResponse;
import org.apache.hugegraph.pd.grpc.pulse.PulseType;

import com.google.protobuf.GeneratedMessageV3;

public class PdInstructionSubject extends AbstractObserverSubject {

    protected PdInstructionSubject() {
        super(PulseType.PULSE_TYPE_PD_INSTRUCTION);
    }

    @Override
    String toNoticeString(PulseResponse res) {
        return res.getInstructionResponse().toString();
    }

    /**
     * Simply send a command to pulse, and do not receive the corresponding notice
     *
     * @return null
     */
    @Override
    Function<PulseNoticeRequest, PdInstructionSubject> getNoticeHandler() {
        return pulseNoticeRequest -> null;
    }

    @Override
    long notifyClient(GeneratedMessageV3 response) {
        return super.notifyClient(b -> {
            b.setInstructionResponse((PdInstructionResponse) response);
        });
    }
}