package org.n3r.idworker.strategy;
import org.n3r.idworker.WorkerIdStrategy;
import org.n3r.idworker.utils.HttpReq;
import org.n3r.idworker.utils.Ip;
import org.n3r.idworker.utils.Props;
import org.n3r.idworker.utils.Utils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.File;
import java.io.IOException;
import java.security.SecureRandom;
import java.util.Properties;
import java.util.Random;
public class DefaultWorkerIdStrategy implements WorkerIdStrategy {
static long workerIdBits = 10L;
static long maxWorkerId = -1L ^ (-1L << workerIdBits);
static Random random = new SecureRandom();
public static final WorkerIdStrategy instance = new DefaultWorkerIdStrategy();
private final Properties props =
Props.tryProperties("idworker-client.properties", Utils.DOT_IDWORKERS);
private final String idWorkerServerUrl =
props.getProperty("server.address", "http://id.worker.server:18001");
String userName = System.getProperty("user.name");
String ipDotUsername = Ip.ip + "." + userName;
String ipudotlock = ipDotUsername + ".lock.";
int workerIdIndex = ipudotlock.length();
long workerId;
FileLock fileLock;
Logger logger = LoggerFactory.getLogger(DefaultWorkerIdStrategy.class);
private boolean inited;
private void init() {
workerId = findAvailWorkerId();
if (workerId >= 0) {
destroyFileLockWhenShutdown();
startSyncThread();
} else {
syncWithWorkerIdServer();
workerId = findAvailWorkerId();
if (workerId < 0) workerId = increaseWithWorkerIdServer();
}
if (workerId < 0) workerId = tryToCreateOnIp();
if (workerId < 0) {
logger.warn("DANGEROUS!!! Try to use random worker id.");
workerId = tryToRandomOnIp(); // Try avoiding! it could cause duplicated
}
if (workerId < 0) {
logger.warn("the world may be ended!");
throw new RuntimeException("the world may be ended");
}
}
private void destroyFileLockWhenShutdown() {
Runtime.getRuntime().addShutdownHook(new Thread() {
@Override
public void run() {
fileLock.destroy();
}
});
}
private void startSyncThread() {
new Thread() {
@Override
public void run() {
syncWithWorkerIdServer();
}
}.start();
}
private long increaseWithWorkerIdServer() {
String incId = HttpReq.get(idWorkerServerUrl)
.req("/inc")
.param("ipu", ipDotUsername)
.exec();
if (incId == null || incId.trim().isEmpty()) return -1L;
long lid = Long.parseLong(incId);
return checkAvail(lid);
}
private long tryToCreateOnIp() {
long wid = Ip.lip & maxWorkerId;
return checkAvail(wid);
}
private long tryToRandomOnIp() {
long avaiWorkerId = -1L;
long tryTimes = -1;
while (avaiWorkerId < 0 && ++tryTimes < maxWorkerId) {
long wid = Ip.lip & random.nextInt((int) maxWorkerId);
avaiWorkerId = checkAvail(wid);
}
return avaiWorkerId;
}
private long checkAvail(long wid) {
long availWorkerId = -1L;
try {
File idWorkerHome = Utils.createIdWorkerHome();
new File(idWorkerHome, ipudotlock + String.format("%04d", wid)).createNewFile();
availWorkerId = findAvailWorkerId();
} catch (IOException e) {
logger.warn("checkAvail error", e);
}
return availWorkerId;
}
private void syncWithWorkerIdServer() {
String syncIds = HttpReq.get(idWorkerServerUrl).req("/sync")
.param("ipu", ipDotUsername).param("ids", buildWorkerIdsOfCurrentIp())
.exec();
if (syncIds == null || syncIds.trim().isEmpty()) return;
String[] syncIdsArr = syncIds.split(",");
File idWorkerHome = Utils.createIdWorkerHome();
for (String syncId : syncIdsArr) {
try {
new File(idWorkerHome, ipudotlock + syncId).createNewFile();
} catch (IOException e) {
logger.warn("create workerid lock file error", e);
}
}
}
private String buildWorkerIdsOfCurrentIp() {
StringBuilder sb = new StringBuilder();
File idWorkerHome = Utils.createIdWorkerHome();
for (File lockFile : idWorkerHome.listFiles()) {
// check the format like 10.142.1.151.lock.0001
if (!lockFile.getName().startsWith(ipudotlock)) continue;
String workerId = lockFile.getName().substring(workerIdIndex);
if (!workerId.matches("\\d\\d\\d\\d")) continue;
if (sb.length() > 0) sb.append(',');
sb.append(workerId);
}
return sb.toString();
}
/**
* Find the local available worker id.
*
* @return -1 when N/A
*/
private long findAvailWorkerId() {
File idWorkerHome = Utils.createIdWorkerHome();
for (File lockFile : idWorkerHome.listFiles()) {
// check the format like 10.142.1.151.lock.0001
if (!lockFile.getName().startsWith(ipudotlock)) continue;
String workerId = lockFile.getName().substring(workerIdIndex);
if (!workerId.matches("\\d\\d\\d\\d")) continue;
FileLock fileLock = new FileLock(lockFile);
if (!fileLock.tryLock()) {
fileLock.destroy();
continue;
}
this.fileLock = fileLock;
return Long.parseLong(workerId);
}
return -1;
}
@Override
public void initialize() {
if (inited) return;
init();
this.inited = true;
}
@Override
public long availableWorkerId() {
return workerId;
}
@Override
public void release() {
if (fileLock != null) fileLock.destroy();
inited = false;
}
}
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