/**
* 黏包 (@see io.netty.handler.codec.LengthFieldBasedFrameDecoder)
*
* @author kim 2015年7月8日
*/
public enum CodecHeader {
ONE,
TWO,
FOUR,
EIGHT;
/** 黏包字节自身长度 */
private static final CodecHeader CODEC =
CodecHeader.valueOf(
PropertiesUtils.get(
CodecHeader.class.getName().toLowerCase() + ".codec", CodecHeader.FOUR.toString()));
private static final Map<CodecHeader, Integer> MAPPING = new HashMap<CodecHeader, Integer>();
static {
MAPPING.put(ONE, 1);
MAPPING.put(TWO, 2);
MAPPING.put(FOUR, 4);
MAPPING.put(EIGHT, 8);
}
public static final int DEFAULT = CodecHeader.CODEC.code();
public int code() {
return MAPPING.get(this).intValue();
}
}
/**
* @author kim
* <p>2016年2月11日
*/
public interface SerialID {
public static final String SERIAL_DEF = "default";
public static final String SERIAL_KEY = SerialID.class.getName().toLowerCase() + ".serial";
/** 默认序列化策略 */
public static final String SERIAL_VAL =
PropertiesUtils.get(SerialID.SERIAL_KEY, SerialID.SERIAL_DEF);
/** 是否允许动态化序列化策略(Profile) */
public static final boolean DYAMIC =
PropertiesUtils.get(SerialID.class.getName().toLowerCase() + ".dynamic", false);
/**
* 获取序列化策略
*
* @return
*/
@JsonProperty
public byte serial();
}
/** @author kim 2015年7月9日 */
public class ZkContext implements Imported, Exported {
public static final String ROOT =
PropertiesUtils.get(Roadmap.class.getName().toLowerCase() + ".root", "/kepler");
public static final boolean WATCH =
Boolean.valueOf(
PropertiesUtils.get(Roadmap.class.getName().toLowerCase() + ".watch", "true"));
/** 单线程防止线程冲突 */
private static final ExecutorService SERVICE = Executors.newFixedThreadPool(1);
private static final Log LOGGER = LogFactory.getLog(ZkContext.class);
private final AtomicBoolean shutdown = new AtomicBoolean();
private final Runnable changed = new ChangedRunnable();
private final Exporteds exported = new Exporteds();
private final Importeds imported = new Importeds();
private final Roadmap road = new Roadmap();
private final RouteChanges changes;
private final HostsContext context;
private final SerialFactory serial;
private final Connect connect;
private final ZooKeeper zoo;
private final Host local;
public ZkContext(
HostsContext context,
RouteChanges changes,
SerialFactory serial,
Connect connect,
ZooKeeper zoo,
Host local) {
super();
this.zoo = zoo;
this.local = local;
this.serial = serial;
this.changes = changes;
this.context = context;
this.connect = connect;
}
public void init() {
ZkContext.SERVICE.execute(this.changed);
}
public void destory() throws Exception {
this.exported.destory();
this.shutdown.set(true);
ZkContext.SERVICE.shutdown();
}
private void put(ZkSerial node, String path) throws Exception {
// 加锁Service all version (粗粒度)
synchronized (node.service()) {
// 同步GetOrCreate
this.context.get(node.service(), node.version()).put(node.host());
}
this.imported.put(path, node.host());
this.connect.connect(node.host());
}
private void importing(String services) throws Exception {
for (String each : this.zoo.getChildren(services, ZkContext.WATCH)) {
try {
String path = services + "/" + each;
// 监听指定版本, 无需node.version(version)
this.put(
this.serial.serial(this.zoo.getData(path, ZkContext.WATCH, null), ZkSerial.class),
path);
} catch (Exception e) {
e.printStackTrace();
ZkContext.LOGGER.error(e.getMessage(), e);
}
}
}
@Override
public void subscribe(Class<?> service, String version) throws Exception {
for (String each :
this.zoo.getChildren(
this.road.roadmap(this.road.path(service, version)), ZkContext.WATCH)) {
try {
String path = this.road.path(service, version, each);
ZkSerial node =
this.serial.serial(this.zoo.getData(path, ZkContext.WATCH, null), ZkSerial.class);
if (node.version(version)) {
this.put(node, path);
}
} catch (Exception e) {
e.printStackTrace();
ZkContext.LOGGER.error(e.getMessage(), e);
}
}
}
@Override
public void exported(Class<?> service, String version, Object instance) throws Exception {
this.exported.put(
this.zoo.create(
this.road.roadmap(this.road.path(service, version)) + (ZkContext.ROOT + "_"),
this.serial.serial(new ZkSerial(this.local, version, service)),
Ids.OPEN_ACL_UNSAFE,
CreateMode.EPHEMERAL_SEQUENTIAL));
}
private class Roadmap {
public String path(Class<?> service, String... path) {
StringBuffer buffer =
new StringBuffer(ZkContext.ROOT)
.append("/")
.append(service.getName().replaceAll("\\.", "/"))
.append("/");
for (String each : path) {
buffer.append(each).append("/");
}
return buffer.substring(0, buffer.length() - 1);
}
public String roadmap(String path) throws Exception {
StringBuffer buffer = new StringBuffer();
for (String each : path.split("/")) {
if (StringUtils.hasText(each)) {
String road = buffer.append("/").append(each).toString();
if (ZkContext.this.zoo.exists(road, ZkContext.WATCH) == null) {
ZkContext.this.zoo.create(
road, new byte[] {}, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
}
}
}
return path;
}
}
private class Exporteds {
private final Set<String> exported = new CopyOnWriteArraySet<String>();
public void put(String path) {
this.exported.add(path);
}
public void destory() {
for (String exported : this.exported) {
try {
ZkContext.this.zoo.delete(exported, 0);
} catch (Exception e) {
e.printStackTrace();
ZkContext.LOGGER.error(e.getMessage(), e);
}
}
}
}
private class Importeds {
private final Map<String, Host> imported = new ConcurrentHashMap<String, Host>();
public void put(String path, Host host) {
this.imported.put(path, host);
}
public void destory(String path) {
Host host = this.imported.remove(path);
if (host != null) {
ZkContext.this.context.del(host);
}
}
}
private class ChangedRunnable implements Runnable {
@Override
public void run() {
while (!ZkContext.this.shutdown.get()) {
try {
RouteChange change = ZkContext.this.changes.get();
switch (change.action()) {
case PUSH:
ZkContext.this.importing(change.route());
continue;
case DEL:
ZkContext.this.imported.destory(change.route());
continue;
}
} catch (Throwable e) {
e.printStackTrace();
ZkContext.LOGGER.error(e.getMessage(), e);
}
}
ZkContext.LOGGER.warn(this.getClass() + " shutdown ...");
}
}
}