org.jboss.narayana.quickstarts.mongodb.simple.UndoDebit.java Source code

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Here is the source code for org.jboss.narayana.quickstarts.mongodb.simple.UndoDebit.java

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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2016, Red Hat, Inc., and others contributors as indicated
 * by the @authors tag. All rights reserved.
 * See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU Lesser General Public License, v. 2.1.
 * This program is distributed in the hope that it will be useful, but WITHOUT A
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
 * You should have received a copy of the GNU Lesser General Public License,
 * v.2.1 along with this distribution; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA  02110-1301, USA.
 */
package org.jboss.narayana.quickstarts.mongodb.simple;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.MongoClient;
import org.jboss.narayana.compensations.api.CompensationHandler;

import javax.inject.Inject;
import java.net.UnknownHostException;

/**
 * This compensation handler is used to undo a debit operation.
 *
 * @author paul.robinson@redhat.com 09/01/2014
 */
public class UndoDebit implements CompensationHandler {

    //This is the credit data stored during the invocation of the method to be compensated. It gives the compensation handler a hint.
    @Inject
    DebitData debitData;

    //Connection to the MongoDB instance
    @Inject
    DB database;

    @Override
    public void compensate() {

        System.out.println(
                "Undoing debit of '" + debitData.getAmount() + "' from '" + debitData.getFromAccount() + "'");

        //Use the debitData to know which account to lookup and by how much to increment the balance.
        DBCollection accounts = database.getCollection("accounts");
        accounts.update(new BasicDBObject("name", debitData.getFromAccount()),
                new BasicDBObject("$inc", new BasicDBObject("balance", debitData.getAmount())));
    }
}