Cleaner.java

package com.aol.micro.server.application.registry;

import java.io.File;
import java.util.Date;
import java.util.stream.Stream;

import javax.annotation.PostConstruct;

import org.apache.commons.io.FileUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import com.aol.micro.server.rest.jackson.JacksonUtil;

@Component
public class Cleaner {

	private final RegisterConfig config;
	private final int maxLive;

	@Autowired
	public Cleaner(RegisterConfig config, @Value("${service.registry.entry.max.live:43200000}") int maxLive) {
		this.config = config;
		this.maxLive = maxLive;
	}

	@PostConstruct
	public void deleteOldFilesAfterEachStartup() {
		cleanDir(new File(config.getOutputDir()), true);
	}

	public void clean() {
		cleanDir(new File(config.getOutputDir()), false);
	}

	private void cleanDir(File dir, boolean deleteWithoutCheck) {
		if (dir.listFiles() != null) {
			Stream.of(dir.listFiles()).forEach((next) -> {
				if (next.isDirectory()) {
					cleanDir(next, deleteWithoutCheck);
				}

				if (next.isFile()) {
					if (deleteWithoutCheck) {
						next.delete();
					} else {
						checkFile(next);
					}
				}

			});
		}
	}

	private void checkFile(File f) {
		try {
			RegisterEntry entry = JacksonUtil.convertFromJson(FileUtils.readFileToString(f), RegisterEntry.class);
			if (new Date().getTime() - maxLive > entry.getTime().getTime())
				f.delete();
		} catch (Exception e) {
			f.delete();
		}
	}
}