fe/src/main/java/org/apache/doris/transaction/TxnCommitAttachment.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
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// specific language governing permissions and limitations
// under the License.

package org.apache.doris.transaction;

import org.apache.doris.common.io.Text;
import org.apache.doris.common.io.Writable;
import org.apache.doris.load.loadv2.LoadJobFinalOperation;
import org.apache.doris.load.loadv2.MiniLoadTxnCommitAttachment;
import org.apache.doris.load.routineload.RLTaskTxnCommitAttachment;
import org.apache.doris.thrift.TTxnCommitAttachment;
import org.apache.doris.transaction.TransactionState.LoadJobSourceType;

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

public abstract class TxnCommitAttachment implements Writable {

    protected TransactionState.LoadJobSourceType sourceType;
    protected boolean isTypeRead = false;

    public TxnCommitAttachment(TransactionState.LoadJobSourceType sourceType) {
        this.sourceType = sourceType;
    }

    public void setTypeRead(boolean isTypeRead) {
        this.isTypeRead = isTypeRead;
    }

    public static TxnCommitAttachment fromThrift(TTxnCommitAttachment txnCommitAttachment) {
        if (txnCommitAttachment != null) {
            switch (txnCommitAttachment.getLoadType()) {
                case ROUTINE_LOAD:
                    return new RLTaskTxnCommitAttachment(txnCommitAttachment.getRlTaskTxnCommitAttachment());
                case MINI_LOAD:
                    return new MiniLoadTxnCommitAttachment(txnCommitAttachment.getMlTxnCommitAttachment());
                default:
                    return null;
            }
        } else {
            return null;
        }
    }

    public static TxnCommitAttachment read(DataInput in) throws IOException {
        TxnCommitAttachment attachment = null;
        LoadJobSourceType type = LoadJobSourceType.valueOf(Text.readString(in));
        if (type == LoadJobSourceType.ROUTINE_LOAD_TASK) {
            attachment = new RLTaskTxnCommitAttachment();
        } else if (type == LoadJobSourceType.BATCH_LOAD_JOB) {
            attachment = new LoadJobFinalOperation();
        } else if (type == LoadJobSourceType.BACKEND_STREAMING) {
            attachment = new MiniLoadTxnCommitAttachment();
        } else {
            throw new IOException("Unknown load job source type: " + type.name());
        }

        attachment.setTypeRead(true);
        attachment.readFields(in);
        return attachment;
    }

    @Override
    public void write(DataOutput out) throws IOException {
        // ATTN: must write type first
        Text.writeString(out, sourceType.name());
    }

    public void readFields(DataInput in) throws IOException {
        if (!isTypeRead) {
            sourceType = LoadJobSourceType.valueOf(Text.readString(in));
            isTypeRead = true;
        }
    }
}