com.gs.fw.common.mithra.list.DeleteAllOneByOneInBatchesCommand Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of reladomo Show documentation

Reladomo is an object-relational mapping framework.

There is a newer version: 18.1.0

/*
 Copyright 2016 Goldman Sachs.
 Licensed 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 com.gs.fw.common.mithra.list;

import com.gs.fw.common.mithra.MithraTransaction;
import com.gs.fw.common.mithra.MithraTransactionalObject;
import com.gs.fw.common.mithra.TransactionalCommand;

import javax.transaction.Synchronization;
import javax.transaction.Status;
import java.util.List;



public class DeleteAllOneByOneInBatchesCommand implements TransactionalCommand, Synchronization
{

    private List toBeDeleted;
    private final int[] batchSize;

    public DeleteAllOneByOneInBatchesCommand(DelegatingList toBeDeleted, int[] batchSize)
    {
        this.toBeDeleted = toBeDeleted;
        this.batchSize = batchSize;
        toBeDeleted.setMaxObjectsToRetrieve(batchSize[0]);
    }

    public Object executeTransaction(MithraTransaction tx) throws Throwable
    {
        tx.registerSynchronization(this);
        int end = batchSize[0];
        if (end > toBeDeleted.size()) end = toBeDeleted.size();
        List subList = toBeDeleted.subList(0, end);
        for (int i = 0; i < subList.size(); i++)
        {
            ((MithraTransactionalObject) subList.get(i)).zPrepareForDelete();
        }
        for(int i=0;i < subList.size();i++)
        {
            ((MithraTransactionalObject)subList.get(i)).delete();
        }
        return subList.size();
    }

    public void afterCompletion(int status)
    {
        if (status != Status.STATUS_COMMITTED && status != Status.STATUS_COMMITTING && batchSize[0] > 100)
        {
            batchSize[0] /= 2;
        }
    }

    public void beforeCompletion()
    {
        // nothing to do
    }
}