基于XSocket框架的socket编程技巧（同步通信）
//接收
ByteBuffer byteBuffer = ByteBuffer.allocate(1024);
int length = bc.read(byteBuffer);
logger.info("length: " + length);
byteBuffer.flip();
byte[] content = new byte[byteBuffer.limit()];
byteBuffer.get(content); // 从ByteBuffer中读取数据到byte数组中
logger.info(new String(content));
byteBuffer.clear();
bc.flush();
// always close the connection! (the connection will be returned into the connection pool)
bc.close();
} catch (IOException ioe) {
logger.info(ioe.toString());
if (bc != null) {
try {
// if the connection is invalid -> destroy it , it will not return to the pool)
pool.destroy(bc);
} catch (Exception ignore) {
}
}
}
}
private static void displayPoolInfo(){
logger.info("--------------------");
logger.info("getMaxActive:" + pool.getMaxActive());
logger.info("getMaxActivePerServer:" + pool.getMaxActivePerServer());
logger.info("getMaxIdle:" + pool.getMaxIdle());
logger.info("getNumIdle:" + pool.getNumIdle());
logger.info("getNumActive:" + pool.getNumActive());
logger.info("getNumCreated:" + pool.getNumCreated());
logger.info("getNumDestroyed:" + pool.getNumDestroyed());
logger.info("getNumPendingGet:" + pool.getNumPendingGet());
logger.info("getNumTimeoutPooledMaxIdleTime:" + pool.getNumTimeoutPooledMaxIdleTime());
logger.info("getNumTimeoutPooledMaxLifeTime:" + pool.getNumTimeoutPooledMaxLifeTime());
logger.info("getPooledMaxIdleTimeMillis:" + pool.getPooledMaxIdleTimeMillis());
logger.info("getPooledMaxLifeTimeMillis:" + pool.getPooledMaxLifeTimeMillis());
logger.info("isOpen:" + pool.isOpen());
for (String str: pool.getActiveConnectionInfos()){
logger.info(str);
}
logger.info("--------------------");
}
public static void main(String[] args) throws Exception {
for (int i = 0; i < 5; i++){
sendMessage("127.0.0.1",8889,"Send messsage to server.");
Thread.sleep(1000);
}
displayPoolInfo();
}
}
And the log is :
INFO (ConnectionPool.java:35) - bc.getId(): 74396444134120d6da52bb96e33C1I0
INFO (ConnectionPool.java:44) - server received data from client sucessful
INFO (ConnectionPool.java:35) - bc.getId(): 74396444134120d6da52bb96e33C2I0
INFO (ConnectionPool.java:44) - server received data from client sucessful
INFO (ConnectionPool.java:35) - bc.getId(): 74396444134120d6da52bb96e33C3I0
INFO (ConnectionPool.java:44) - server received data from client sucessful
INFO (ConnectionPool.java:35) - bc.getId(): 74396444134120d6da52bb96e33C4I0
INFO (ConnectionPool.java:44) - server received data from client sucessful
INFO (ConnectionPool.java:35) - bc.getId(): 74396444134120d6da52bb96e33C5I0
INFO (ConnectionPool.java:44) - server received data from client sucessful
INFO (ConnectionPool.java:63) - --------------------
INFO (ConnectionPool.java:64) - getMaxActive:10000
INFO (ConnectionPool.java:65) - getMaxActivePerServer:2147483647
INFO (ConnectionPool.java:66) - getMaxIdle:5000
INFO (ConnectionPool.java:67) - getNumIdle:0
INFO (ConnectionPool.java:68) - getNumActive:5
INFO (ConnectionPool.java:69) - getNumCreated:5
INFO (ConnectionPool.java:70) - getNumDestroyed:0
INFO (ConnectionPool.java:71) - getNumPendingGet:0
INFO (ConnectionPool.java:72) - getNumTimeoutPooledMaxIdleTime:0
INFO (ConnectionPool.java:73) - getNumTimeoutPooledMaxLifeTime:0
INFO (ConnectionPool.java:74) - getPooledMaxIdleTimeMillis:2147483647
INFO (ConnectionPool.java:75) - getPooledMaxLifeTimeMillis:2147483647
INFO (ConnectionPool.java:76) - isOpen:true
INFO (ConnectionPool.java:78) - /127.0.0.1:3608 -> /127.0.0.1:8889 [74396444134120d6da52bb96e33C1] creationTime=2011.12.06 14:26:37, ageMillis=5141, elapsedLastUsageMillis=5031, countUsage=1, isReusable=true
INFO (ConnectionPool.java:78) - /127.0.0.1:3613 -> /127.0.0.1:8889 [74396444134120d6da52bb96e33C2] creationTime=2011.12.06 14:26:38, ageMillis=4031, elapsedLastUsageMillis=4031, countUsage=1, isReusable=true
INFO (ConnectionPool.java:78) - /127.0.0.1:3614 -> /127.0.0.1:8889 [74396444134120d6da52bb96e33C3] creationTime=2011.12.06 14:26:39, ageMillis=3031, elapsedLastUsageMillis=3031, countUsage=1, isReusable=true
INFO (ConnectionPool.java:78) - /127.0.0.1:3615 -> /127.0.0.1:8889 [74396444134120d6da52bb96e33C4] creationTime=2011.12.06 14:26:40, ageMillis=2031, elapsedLastUsageMillis=2031, countUsage=1, isReusable=true
INFO (ConnectionPool.java:78) - /127.0.0.1:3616 -> /127.0.0.1:8889 [74396444134120d6da52bb96e33C5] creationTime=2011.12.06 14:26:41, ageMillis=1031, elapsedLastUsageMillis=1031, countUsage=1, isReusable=true
INFO (ConnectionPool.java:81) - --------------------
Why 5 connections has been created? In my opinion, only one connection should be created, because :
for (int i = 0; i < 5; i++){
sendMessage("127.0.0.1",8889,"Send messsage to server.");
Thread.sleep(1000);
}
同样的address and port, and "bc = pool.getBlockingConnection(host, port);" means "getting a pool connection for the given address. If no free connection is in the pool, a new one will be created. "
但是从第二次循环开始，该地址和端口已经有一个连接了，就不应该建立连接了.
2 楼 tony_zq 2011-12-08 还有一个问题，就是如果设置：
bc.setIdleTimeoutMillis(1000); //sets the idle timeout in millis,在调用close方法后开始算起的
那么1秒后，连接不是idle，而是Destroyed
INFO (ConnectionPool.java:67) - getNumIdle:0
INFO (ConnectionPool.java:68) - getNumActive:0
INFO (ConnectionPool.java:69) - getNumCreated:5
INFO (ConnectionPool.java:70) - getNumDestroyed:5
bc.close(); 的意思是// always close the connection! (the connection will be returned into the connection pool)，同时设置了bc.setIdleTimeoutMillis(1000);按理结果应该是：
INFO (ConnectionPool.java:67) - getNumIdle:5
INFO (ConnectionPool.java:68) - getNumActive:0
INFO (ConnectionPool.java:69) - getNumCreated:5
INFO (ConnectionPool.java:70) - getNumDestroyed:0
问题出在哪里？？？？？？