hugegraph-pd/hg-pd-service/src/main/java/org/apache/hugegraph/pd/watch/PartitionChangeSubject.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.watch;

import static org.apache.hugegraph.pd.common.HgAssert.isArgumentNotNull;
import static org.apache.hugegraph.pd.common.HgAssert.isArgumentValid;

import javax.annotation.concurrent.ThreadSafe;

import org.apache.hugegraph.pd.grpc.watch.WatchChangeType;
import org.apache.hugegraph.pd.grpc.watch.WatchResponse;
import org.apache.hugegraph.pd.grpc.watch.WatchType;

/**
 * The subject of partition change.
 */
@ThreadSafe
final class PartitionChangeSubject extends AbstractWatchSubject {

    PartitionChangeSubject() {
        super(WatchType.WATCH_TYPE_PARTITION_CHANGE);
    }

    @Override
    String toNoticeString(WatchResponse res) {
        String sb = "graph:" + res.getPartitionResponse().getGraph() +
                    "," +
                    "partitionId:" + res.getPartitionResponse().getPartitionId();
        return sb;
    }

    public void notifyWatcher(WatchChangeType changeType, String graph, int partitionId) {
        isArgumentNotNull(changeType, "changeType");
        isArgumentValid(graph, "graph");

        super.notifyWatcher(builder -> {
            builder.setPartitionResponse(
                    builder.getPartitionResponseBuilder().clear()
                           .setGraph(graph)
                           .setPartitionId(partitionId)
                           .setChangeType(changeType)
                           .build()
            );

        });
    }

}