com.javacreed.examples.sc.part3.MembersServiceImpl.java Source code

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Here is the source code for com.javacreed.examples.sc.part3.MembersServiceImpl.java

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/**
 * Copyright 2012-2014 Java Creed.
 * 
 * Licensed under the Apache License, Version 2.0 (the "<em>License</em>");
 * 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.javacreed.examples.sc.part3;

import java.io.File;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Component;

@Component
public class MembersServiceImpl implements MembersService, InitializingBean, DisposableBean {

    private final File dataFile = new File("members.txt");

    @Override
    public void afterPropertiesSet() throws Exception {
        FileUtils.writeByteArrayToFile(dataFile, IOUtils.toByteArray(getClass().getResource("members.txt")));
    }

    @Override
    public void destroy() throws Exception {
        dataFile.delete();
    }

    @Override
    @Cacheable("members")
    public Member getMemberWithId(final int id) {
        System.out.printf("Retrieving the member with id: [%d] from file: %s%n", id, dataFile.getAbsolutePath());
        try {
            for (final String line : FileUtils.readLines(dataFile, "UTF-8")) {
                final String[] parts = line.split(",");
                final int memberId = Integer.parseInt(parts[0]);
                if (memberId == id) {
                    return new Member(memberId, parts[1]);
                }
            }
        } catch (final Exception e) {
            throw new RuntimeException("Failed to load members", e);
        }

        return null;
    }

    @Override
    @CacheEvict(value = "members", allEntries = true)
    public void saveMember(final Member member) {
        try {
            final StringBuilder toSave = new StringBuilder();
            for (final String line : FileUtils.readLines(dataFile, "UTF-8")) {
                final String[] parts = line.split(",");
                final int memberId = Integer.parseInt(parts[0]);
                if (memberId == member.getMemberId()) {
                    toSave.append(memberId).append(",").append(member.getMemberName()).append("\n");
                } else {
                    toSave.append(line).append("\n");
                }
            }

            FileUtils.write(new File("members.txt"), toSave.toString().trim(), "UTF-8");
        } catch (final Exception e) {
            throw new RuntimeException("Failed to save members", e);
        }
    }
}