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±¾ÎÄÖ÷Òª½éÉÜÁ˶àÏß³ÌÉè¼ÆµÄfutureģʽ£¬Master-WokerģʽµÈ£¬Ï£Íû¶ÔÄúÄÜÓÐËù°ïÖú¡£
±¾ÎÄÀ´×ÔÓÚcsdn£¬ÓÉ»ðÁú¹ûÈí¼þÁõ衱à¼ÍƼö
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Ò»¡¢Futureģʽ
˼Ï룺
µ±service£¨Main·½·¨Ä£Ä⣩ÇëÇóÒ»¸öÊý¾ÝµÄʱºò£¬¿ÉÒÔÏȸøËû·µ»ØÒ»¸ö°ü×°Àࣨ¿Õ¿Ç£¬´úÀí¶ÔÏó£¬Î´À´data,FutureData£©
È»ºó¿ªÒ»¸öÏß³ÌÈ¥Òì²½¼ÓÔØÕæÊµÊý¾Ý£¬ÕâÑùµ±serviceÊÕµ½FutrueData£¬¾Í¿ÉÒÔ×öÆäËûÒµÎñÂß¼£¬
µ±ÒªÓõÄʱºò£¬ÔÙ´ÓFutureDataÖеķ½·¨È¥¼ÓÔØÕæÊµÊý¾Ý¡££¨ÀàËÆajaxµÄ˼Ï룩
Æô¶¯³ÌÐò£ºÄ£ÄâÒ»¸öÇëÇó
/**
* Ä£ÄâÒ»¸öserviceÇëÇó
*/
public class Main {
public static void main(String[] args) throws
InterruptedException {
/**
* δÀ´Ä£Ê½µÄÖ´ÐÐÀà,Ìṩ´¦ÀíÇëÇóµÄ·½·¨handleRequest
*/
FutureExcutor fc = new FutureExcutor();
/**
* 1¡¢DataÊÇÒ»¸ö½Ó¿Ú£¬ÌṩʵÏÖÀàFuctureDataºÍRealData
* 2¡¢Î´À´Ä£Ê½Ö´ÐÐÀ࣬ÏȸøÎÒÃÇ·µ»ØÒ»¸öFuctureData,È»ºó¿ªÁËÒ»¸öÏß³ÌÈ¥¼ÓÔØÕæÊµÊý¾ÝÁË
*
*/
Data data = fc.handleRequest("ÇëÇó²ÎÊý");
/**
* ÊÕµ½FutureDataºó£¬¿ÉÒÔÈ¥´¦ÀíÆäËûÒµÎñÂß¼
*/
System.out.println("×öÆäËûµÄÊÂÇé...");
/**
* 1¡¢´¦ÀíÍêÆäËû£¬Òªµ÷ÓÃδÀ´Êý¾ÝFutureDataµÄ·½·¨¼ÓÔØÕæÊµÊý¾ÝÁË
* 1.1¡¢Õâ¸ögetResultData¿Ï¶¨µÄÊÇ×èÈûµÄ£¬ÒòΪ²»È·¶¨ÕæÊµÊý¾ÝÊÇ·ñ¼ÓÔØ ³É¹¦£¬Ö»Óе±setResultDataµ÷ÓÃÁË£¬²ÅÄܰÑ×èÈû´ò¿ª
* ËùÒÔÕâÁ½¸ö·½·¨getResultData¡¢setResultData¿ÉÒÔÓÃ×èÈû¶ÓÁÐÀ´ÊµÏÖSynchronousQueue
* 1.2¡¢ÕâÀï²ÉÓõÄÊÇwait,notify,synchronizedÀ´ÊµÏÖµÄ
*/
String result = data.getResultData();
System.out.println(result);
}
} |
-
/**
* FutureģʽִÐÐÆ÷
*/
public class FutureExcutor {
public Data handleRequest(final String queryStr){
//1 ÎÒÏëÒªÒ»¸ö´úÀí¶ÔÏó£¨Data½Ó¿ÚµÄʵÏÖÀࣩ ÏÈ·µ»Ø¸ø·¢ËÍÇëÇóµÄ¿Í»§¶Ë£¬ ¸æËßËûÇëÇóÒѾ½ÓÊÕµ½£¬¿ÉÒÔ×öÆäËûµÄÊÂÇé
final FutureData futureData = new FutureData();
//2 Æô¶¯Ò»¸öеÄỊ̈߳¬È¥¼ÓÔØÕæÊµµÄÊý¾Ý£¬´«µÝ¸øÕâ¸ö´úÀí¶ÔÏó
new Thread(new Runnable() {
@Override
public void run() {
//3 Õâ¸öеÄÏ߳̿ÉÒÔÈ¥ÂýÂýµÄ¼ÓÔØÕæÊµ¶ÔÏó£¬ È»ºó´«µÝ¸ø´úÀí¶ÔÏó
RealData realData = new RealData(queryStr);
futureData.setRealData(realData);
}
}).start();
return futureData;
}
} |
-
/**
* Êý¾Ý½Ó¿Ú
*/
public interface Data {
/**
* Ìṩ½á¹ûµÄ½Ó¿Ú
* @return
*/
String getResultData();
} |
-
/**
* futureÊý¾ÝʵÏÖData
*/
public class FutureData implements Data{
private RealData realData ;
private boolean isReady = false;
public synchronized void setRealData(RealData
realData) {
//Èç¹ûÒÑ¾×°ÔØÍê±ÏÁË£¬¾ÍÖ±½Ó·µ»Ø
if(isReady){
return;
}
//Èç¹ûÃ»×°ÔØ£¬½øÐÐ×°ÔØÕæÊµ¶ÔÏó
this.realData = realData;
isReady = true;
//½øÐÐ֪ͨ
notify();
}
@Override
public synchronized String getResultData() {
//Èç¹ûÃ»×°ÔØºÃ ³ÌÐò¾ÍÒ»Ö±´¦ÓÚ×èÈû״̬
while(!isReady){
try {
wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
//×°ÔØºÃÖ±½Ó»ñÈ¡Êý¾Ý¼´¿É
return this.realData.getResultData();
}
}
|
-
/**
* ÕæÊµÊý¾Ý
*/
public class RealData implements Data{
private String result ;
public RealData (String queryStr){
try {
System.out.println("¸ù¾Ý" + queryStr +
"½øÐвéѯ£¬ÕâÊÇÒ»¸öºÜºÄʱµÄ²Ù×÷");
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
result = "20000";
}
@Override
public String getResultData() {
return result;
}
}
|
JDKÒѾÌṩÁË»ùÓÚFuctureģʽµÄÀà£¨ÖØÒª£©£º
FutureTask£¨ÀàËÆÉÏÃæµÄFutureData£©,Callable£¨ÀàËÆRealDataµÄ·â×°£¬ÕæÊµ¼ÓÔØÊý¾ÝҪʵÏÖCallable½Ó¿Ú£©
Fucure£¨½ÓÊÕÖ´ÐÐ״̬£©
Ïëµ½µÄfutureģʽӦÓó¡¾°£ºÔÚserviceÖÐÒªÖ´ÐУ¬±È½ÏºÄʱµÄsql»òÕß´æ´¢¹ý³Ì£¬¿ÉÒÔÏÈ¿ªÒ»¸öÏ̳߳ص¥¶ÀÖ´ÐУ¬
¿ÉÒÔÈÃËûÃÇʵÏÖCallable½Ó¿Ú£¬È»ºó¼ÌÐøÖ´ÐÐservice·½·¨£¬ÒªÓõÄʱºòÔÙ´ÓFutureTaskÖлñÈ¡
Óû§µÇ¼ע²á-->°Ñ¼Ç¼Óû§µÇ¼Ã÷ϸ±íµÄ²Ù×÷£¬ÍÆË͵ȲÙ×÷£¨Èç¹û²»Ó÷µ»Ø½á¹û¿ÉÒÔÖ±½Ó¶ªµ½Ï̳߳أ¬²»ÐèÒªfutureģʽ£©
ͳ¼Æ¹¦ÄÜ-->´Ó¶à¸ö±í²éѯ£¬È»ºó»ã×ܵŦÄÜ
ÍøÂçÊý¾Ý»ñÈ¡ -->Òªµ÷ÓÃÔ¶³Ì½Ó¿ÚµÃµ½Êý¾ÝµÄ¹¦ÄÜ
°¸Àý£¨ÖØÒª£©£º
public class
UseFuture implements Callable<String>{
private String para;
public UseFuture(String para){
this.para = para;
}
/**
* ÕâÀïÊÇÕæÊµµÄÒµÎñÂß¼£¬ÆäÖ´ÐпÉÄܺÜÂý
*/
@Override
public String call() throws Exception {
//Ä£ÄâÖ´ÐкÄʱ
Thread.sleep(5000);
String result = this.para + "ÕæÊµÊý¾Ý¼ÓÔØ";
return result;
}
//Ö÷¿ØÖƺ¯Êý
public static void main(String[] args) throws
Exception {
String queryStr = "query";
//¹¹ÔìFutureTask£¬²¢ÇÒ´«ÈëÐèÒªÕæÕý½øÐÐÒµÎñÂß¼´¦ÀíµÄÀà, ¸ÃÀà Ò»¶¨ÊÇʵÏÖÁËCallable½Ó¿ÚµÄÀà
FutureTask<String> future = new FutureTask<String>(new
UseFuture(queryStr));
//´´½¨Ò»¸ö¹Ì¶¨Ï̵߳ÄÏ̳߳ØÇÒÏß³ÌÊýΪ1,
ExecutorService executor = Executors.newFixedThreadPool(2);
//ÕâÀïÌá½»ÈÎÎñfuture,Ôò¿ªÆôÏß³ÌÖ´ÐÐRealDataµÄcall()·½·¨Ö´ÐÐ
//submitºÍexecuteµÄÇø±ð£º µÚÒ»µãÊÇsubmit¿ÉÒÔ´«Èë ʵÏÖCallable½Ó¿Ú
µÄʵÀý¶ÔÏó£¬ µÚ¶þµãÊÇsubmit·½·¨Óзµ»ØÖµ
Future<?> f1 = executor.submit(future);
//µ¥¶ÀÆô¶¯Ò»¸öÏß³ÌÈ¥Ö´ÐеÄ
while(true){
if(f1.get()==null){
System.out.println("callableÒѾִÐÐÍêÁË");
break;
}
}
try {
//ÕâÀï¿ÉÒÔ×ö¶îÍâµÄÊý¾Ý²Ù×÷£¬Ò²¾ÍÊÇÖ÷³ÌÐòÖ´ÐÐÆäËûÒµÎñÂß¼
System.out.println("´¦Àíʵ¼ÊµÄÒµÎñÂß¼...");
Thread.sleep(1000);
} catch (Exception e) {
e.printStackTrace();
}
//µ÷ÓûñÈ¡Êý¾Ý·½·¨,Èç¹ûCallable()·½·¨Ã»ÓÐÖ´ÐÐÍê³É, ÔòÒÀÈ»»á ½øÐеȴý
System.out.println("futureģʽ»ñµÃµÄÊý¾Ý£º"
+ future.get());
executor.shutdown();
}
}
|
¶þ¡¢Master-Wokerģʽ
˼Ï룺
Master-WorkerģʽÊdz£ÓõIJ¢ÐмÆËãģʽ¡£
ËüµÄºËÐÄ˼ÏëÊÇϵͳÓÉÁ½Àà½ø³ÌÐ×÷¹¤×÷£ºMaster½ø³ÌºÍWorker½ø³Ì¡£
Master¸ºÔð½ÓÊպͷÖÅäÈÎÎñ£¬Worker¸ºÔð´¦Àí×ÓÈÎÎñ¡£
µ±¸÷¸öWorker×Ó½ø³Ì´¦ÀíÍê³Éºó£¬»á½«½á¹û·µ»Ø¸øMaster£¬ÓÉMaster×ö¹éÄɺÍ×ܽᡣ
ÆäºÃ´¦ÊÇÄܽ«Ò»¸ö´óÈÎÎñ·Ö½â³ÉÈô¸É¸öСÈÎÎñ£¬²¢ÐÐÖ´ÐУ¬´Ó¶øÌá¸ßϵͳµÄÍÌÍÂÁ¿¡£
public class
Main {
public static void main(String[] args) {
//Ï̳߳صĸöÊý°´ÕÕ»úÆ÷ÐÔÄÜÀ´¶¨,¿ÉÒÔÓãº
int workerCount = Runtime.getRuntime(). availableProcessors();
//System.out.println(Runtime.getRuntime(). availableProcessors());
/**
* ´´½¨Master,²¢Ö¸¶¨´´½¨N¸öworker
*/
Master master = new Master(workerCount);
/**
* Ìí¼Ó100¸öÈÎÎñ
*/
Random r = new Random();
for(int i = 1; i <= 100; i++){
Task t = new Task(i, r.nextInt(1000));
//Ìí¼Óµ½ÈÎÎñ¶ÓÁУ¬·Ç×èÈûµÄ£¬¿ÉÒÔ²ÉÓøßÐÔÄÜµÄ ConcurrentLinkedQueue À´´æ·Å
master.submit(t);
}
/**
* Ö´ÐÐËùÓеÄworker
*/
master.execute();
long start = System.currentTimeMillis();
while(true){
/**
* Èç¹ûËùÓеÄwoker¶¼Í£Ö¹ÁË£¬ÄÇô½áÊø
*/
if(master.isComplete()){
long end = System.currentTimeMillis() - start;
int priceResult = master.getResult();
System.out.println("×îÖÕ½á¹û£º" + priceResult
+ ", Ö´ÐÐʱ¼ä£º" + end);
break;
}
}
}
}
|
Master:
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentLinkedQueue;
public class Master {
//1 ÓÐÒ»¸öÊ¢·ÅÈÎÎñµÄÈÝÆ÷
private ConcurrentLinkedQueue<Task> workQueue
= new ConcurrentLinkedQueue<Task>();
//2 ÐèÒªÓÐÒ»¸öÊ¢·ÅworkerµÄ¼¯ºÏ£¬¿ÉÒÔÓÃÏ̳߳ØExcutor
private HashMap<String, Thread> workers
= new HashMap <String, Thread>();
//3 ÐèÒªÓÐÒ»¸öÊ¢·Åÿһ¸öworkerÖ´ÐÐÈÎÎñ µÄ½á¹û¼¯ºÏ
private ConcurrentHashMap<String, Object>
resultMap = new ConcurrentHashMap<String, Object>();
//4 ¹¹Ôì·½·¨,´´½¨masterºÍÖ¸¶¨¸öÊýµÄworker
public Master(int workerCount){
Worker worker = new Worker();
worker.setWorkQueue(this.workQueue);
worker.setResultMap(this.resultMap);
for(int i = 0; i < workerCount; i ++){
this.workers.put(Integer.toString(i), new Thread
(worker));
}
}
//5 ÐèÒªÒ»¸öÌá½»ÈÎÎñµÄ·½·¨
public void submit(Task task){
this.workQueue.add(task);
}
//6 ÐèÒªÓÐÒ»¸öÖ´Ðеķ½·¨£¬Æô¶¯ËùÓеÄworker·½·¨È¥Ö´ÐÐÈÎÎñ
public void execute(){
for(Map.Entry<String, Thread> me : workers.entrySet()){
me.getValue().start();
}
}
//7 ÅжÏÊÇ·ñÔËÐнáÊøµÄ·½·¨
public boolean isComplete() {
for(Map.Entry<String, Thread> me : workers.entrySet()){
if(me.getValue().getState() != Thread.State.TERMINATED){
return false;
}
}
return true;
}
//8 ¼ÆËã½á¹û·½·¨
public int getResult() {
int priceResult = 0;
for(Map.Entry<String, Object> me : resultMap.entrySet()){
priceResult += (Integer)me.getValue();
}
return priceResult;
}
}
|
Woker:
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentLinkedQueue;
public class Worker implements Runnable {
private ConcurrentLinkedQueue<Task> work Queue;
private ConcurrentHashMap<String, Object>
resultMap;
public void setWorkQueue(ConcurrentLinkedQueue<Task>
workQueue) {
this.workQueue = workQueue;
}
public void setResultMap(ConcurrentHashMap<String,
Object> resultMap) {
this.resultMap = resultMap;
}
@Override
public void run() {
while(true){
//È¡ÈÎÎñ
Task input = this.workQueue.poll();
if(input == null) break;
//´¦ÀíÈÎÎñ£¬¿É°ÑÕâ¸ö·½·¨±ä³É³éÏó·½·¨£¬¾ßÌåµÄÒµÎñ£¬ ¼Ì³ÐWorker À´ÊµÏÖ
Object output = handle(input);
//°Ñ´¦Àí½á¹û·Åµ½MasterµÄ½á¹û´¦Àí¼¯ÀïÃæ
this.resultMap.put(Integer.toString(input.getId()),
output);
}
}
private Object handle(Task input) {
Object output = null;
try {
//´¦ÀíÈÎÎñµÄºÄʱ¡£¡£ ±ÈÈç˵½øÐвÙ×÷Êý¾Ý¿â¡£¡£¡£
Thread.sleep(500);
output = input.getPrice();
} catch (InterruptedException e) {
e.printStackTrace();
}
return output;
}
}
|
-
public class
Task {
private int id;
private int price ;
public Task(int id, int price) {
super();
this.id = id;
this.price = price;
}
public Task(){}
//set ,get
}
|
Èý¡¢Éú²úÕß-Ïû·ÑÕß
Éú²úÕߺÍÏû·ÑÕßÒ²ÊÇÒ»¸ö·Ç³£¾µäµÄ¶àÏß³Ìģʽ£¬
ÎÒÃÇÔÚʵ¼Ê¿ª·¢ÖÐÓ¦Ó÷dz£¹ã·ºµÄ˼ÏëÀíÄî¡£
ÔÚÉú²ú-Ïû·ÑģʽÖУºÍ¨³£ÓÉÁ½ÀàỊ̈߳¬¼´Èô¸É¸öÉú²úÕßµÄÏ̺߳ÍÈô¸É¸öÏû·ÑÕßµÄÏ̡߳£
Éú²úÕßÏ̸߳ºÔðÌá½»Óû§ÇëÇó£¬Ïû·ÑÕßÏß³ÌÔò¸ºÔð¾ßÌå´¦ÀíÉú²úÕßÌá½»µÄÈÎÎñ£¬
ÔÚÉú²úÕߺÍÏû·ÑÕßÖ®¼äͨ¹ý¹²ÏíÄڴ滺´æÇø½øÐÐͨÐÅ¡£
½ÇÉ«£ºÉú²úÕß¡¢Ïû·ÑÕß¡¢Äڴ滺´æÇø¡¢ÈÎÎñÊý¾Ý£¨»òÕß½ÐÐÒéÊý¾Ý£©
Éú²ú-Ïû·ÑÄ£ÐÍÖеÄÄڴ滺´æÇøµÄÖ÷Òª¹¦ÄÜÊÇÊý¾ÝÔÚ¶àÏ̼߳乲Ïí¡£
´ËÍ⣬Æä×îÖØÒªµÄÊÇͨ¹ý¸Ã»º´æÇø¿ÉÒÔ»º½âÉú²úÕߺÍÏû·ÑÕßÖ®¼äµÄÐÔÄܲîÒì¡£
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.LinkedBlockingQueue;
public class Main {
public static void main(String[] args) throws
Exception {
//Äڴ滺³åÇø,ÓÃÓÚ»º´æÈÎÎñ
BlockingQueue<Data> queue = new LinkedBlockingQueue
<Data>(10);
//Éú²úÕß
Provider p1 = new Provider(queue);
Provider p2 = new Provider(queue);
Provider p3 = new Provider(queue);
//Ïû·ÑÕß
Consumer c1 = new Consumer(queue);
Consumer c2 = new Consumer(queue);
Consumer c3 = new Consumer(queue);
//´´½¨Ï̳߳ØÔËÐÐ,ÕâÊÇÒ»¸ö»º´æµÄÏ̳߳أ¬¿ÉÒÔ´´½¨ÎÞÇî´óµÄỊ̈߳¬ ûÓÐÈÎÎñµÄʱºò²»´´½¨Ï̡߳£¿ÕÏÐÏ̴߳æ»îʱ¼äΪ60s£¨Ä¬ÈÏÖµ£©
ExecutorService cachePool = Executors.newCachedThreadPool();
cachePool.execute(p1);
cachePool.execute(p2);
cachePool.execute(p3);
cachePool.execute(c1);
cachePool.execute(c2);
cachePool.execute(c3);
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
e.printStackTrace();
}
p1.stop();
p2.stop();
p3.stop();
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
// cachePool.shutdown();
// cachePool.shutdownNow();
}
}
|
-
import java.util.Random;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
public class Provider implements Runnable{
//¹²Ïí»º´æÇø
private BlockingQueue<Data> queue;
//¶àÏ̼߳äÊÇ·ñÆô¶¯±äÁ¿£¬ÓÐÇ¿ÖÆ´ÓÖ÷ÄÚ´æÖÐË¢ÐµĹ¦ÄÜ¡£ ¼´Ê±·µ»ØÏß³Ì µÄ״̬
private volatile boolean isRunning = true;
//idÉú³ÉÆ÷
private static AtomicInteger count = new AtomicInteger();
//Ëæ»ú¶ÔÏó
private static Random r = new Random();
public Provider(BlockingQueue<Data> queue){
this.queue = queue;
}
@Override
public void run() {
while(isRunning){
try {
//Ëæ»úÐÝÃß0 - 1000 ºÁÃë ±íʾ»ñÈ¡Êý¾Ý(²úÉúÊý¾ÝµÄºÄʱ)
Thread.sleep(r.nextInt(1000));
//»ñÈ¡µÄÊý¾Ý½øÐÐÀÛ¼Æ...
int id = count.incrementAndGet();
//±ÈÈçͨ¹ýÒ»¸ögetData·½·¨»ñÈ¡ÁË
Data data = new Data(Integer.toString(id), "Êý¾Ý"
+ id);
System.out.println("µ±Ç°Ïß³Ì:" + Thread.current
Thread(). getName() + ", »ñÈ¡ÁËÊý¾Ý£¬idΪ:"
+ id + ", ½øÐÐ×°ÔØµ½¹«¹²»º³åÇøÖÐ...");
if(!this.queue.offer(data, 2, TimeUnit.SECONDS)){
System.out.println("Ìá½»»º³åÇøÊý¾Ýʧ°Ü....");
//do something... ±ÈÈçÖØÐÂÌá½»
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public void stop(){
this.isRunning = false;
}
}
|
-
import java.util.Random;
import java.util.concurrent.BlockingQueue;
public class Consumer implements Runnable{
private BlockingQueue<Data> queue;
public Consumer(BlockingQueue<Data> queue){
this.queue = queue;
}
//Ëæ»ú¶ÔÏó
private static Random r = new Random();
@Override
public void run() {
while(true){
try {
//»ñÈ¡Êý¾Ý
Data data = this.queue.take();
//½øÐÐÊý¾Ý´¦Àí¡£ÐÝÃß0 - 1000ºÁÃëÄ£ÄâºÄʱ
Thread.sleep(r.nextInt(1000));
System.out.println("µ±Ç°Ïû·ÑỊ̈߳º" + Thread.
currentThread(). getName() + "£¬ Ïû·Ñ³É¹¦£¬Ïû·ÑÊý¾ÝΪid:
" + data.getId());
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
|
-
public final
class Data {
private String id;
private String name;
public Data(String id, String name){
this.id = id;
this.name = name;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString(){
return "{id: " + id + ", name:
" + name + "}";
}
}
|
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