fineract-provider/src/main/java/org/apache/fineract/cob/loan/AbstractLoanItemReader.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.fineract.cob.loan;

import java.util.concurrent.LinkedBlockingQueue;
import lombok.AccessLevel;
import lombok.RequiredArgsConstructor;
import lombok.Setter;
import lombok.extern.slf4j.Slf4j;
import org.apache.fineract.cob.exceptions.LoanReadException;
import org.apache.fineract.portfolio.loanaccount.domain.Loan;
import org.apache.fineract.portfolio.loanaccount.domain.LoanRepository;
import org.apache.fineract.portfolio.loanaccount.exception.LoanNotFoundException;
import org.jetbrains.annotations.NotNull;
import org.springframework.batch.core.ExitStatus;
import org.springframework.batch.core.StepExecution;
import org.springframework.batch.core.annotation.AfterStep;
import org.springframework.batch.item.ItemReader;

@Slf4j
@RequiredArgsConstructor
public abstract class AbstractLoanItemReader implements ItemReader<Loan> {

    protected final LoanRepository loanRepository;

    @Setter(AccessLevel.PROTECTED)
    private LinkedBlockingQueue<Long> remainingData;

    @Override
    public Loan read() throws Exception {
        final Long loanId = remainingData.poll();
        if (loanId != null) {
            try {
                return loanRepository.findById(loanId).orElseThrow(() -> new LoanNotFoundException(loanId));
            } catch (Exception e) {
                throw new LoanReadException(loanId, e);
            }
        }
        return null;
    }

    @AfterStep
    public ExitStatus afterStep(@NotNull StepExecution stepExecution) {
        return ExitStatus.COMPLETED;
    }

}