TSOServiceState.java

// Licensed to the Apache Software Foundation (ASF) under one
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// 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
//
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// software distributed under the License is distributed on an
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// specific language governing permissions and limitations
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package org.apache.doris.tso;

import org.apache.doris.common.io.Text;
import org.apache.doris.common.io.Writable;
import org.apache.doris.persist.gson.GsonUtils;

import com.google.gson.annotations.SerializedName;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;

/** The durable allocation window and readable transaction prefix, published as one snapshot. */
public final class TSOServiceState implements Writable {
    @SerializedName("windowEndPhysicalTimeMs")
    private final long windowEndPhysicalTimeMs;
    @SerializedName("committedTso")
    private final long committedTso;

    public TSOServiceState(long windowEndPhysicalTimeMs, long committedTso) {
        this.windowEndPhysicalTimeMs = windowEndPhysicalTimeMs;
        this.committedTso = committedTso;
    }

    public long getWindowEndPhysicalTimeMs() {
        return windowEndPhysicalTimeMs;
    }

    /** Zero means no readable prefix has been established. */
    public long getCommittedTso() {
        return committedTso;
    }

    @Override
    public void write(DataOutput out) throws IOException {
        Text.writeString(out, GsonUtils.GSON.toJson(this));
    }

    public static TSOServiceState read(DataInput in) throws IOException {
        TSOServiceState state = GsonUtils.GSON.fromJson(Text.readString(in), TSOServiceState.class);
        if (state == null) {
            throw new IOException("failed to deserialize TSO service state from journal/image");
        }
        return state;
    }
}