vongosling

Love brevity and simplicity

vongosling

Ubuntu 12.04.4,Kernel 3.5.0-45-generic

Problem 1:

Failed to start emulator: Cannot run program "/usr/bin/android-studio/sdk/tools/emulator": java.io.IOException: error=2

Solution:

sudo apt-get install libc6-i386 lib32stdc++6 lib32gcc1 lib32ncurses5

Problem 2:

/android-4.4/aapt: error while loading shared libraries: libz.so.1: cannot open shared object file: No such file or directory

Solution:

vongosling

/**
 * 史上最棒的HttpClient4封装,details please see
 * http://hc.apache.org/httpcomponents-client-ga/tutorial/html/index.html
 * 
 * @author von gosling 2013-5-7
 */
public class HttpClientManager {

    //Consider ulimit
    private static final int                   DEFAULT_MAX_TOTAL_CONNECTIONS     = 7500;

vongosling

makefiles usage

vongosling

import java.io.IOException;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.CompletionService;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.ExecutorService;

vongosling

LInux

Three system configuration parameters must be set to support a large number of open files and TCP connections with large bursts of messages. Changes can be made using the /etc/rc.d/rc.local or /etc/sysctl.conf script to preserve changes after reboot.

1. /proc/sys/fs/file-max: The maximum number of concurrently open files.

fs.file-max = 1000000

2. /proc/sys/net/ipv4/tcp_max_syn_backlog: Maximum number of remembered connection requests, which are still did not receive an acknowledgment from connecting client. The default value is 1024 for systems with more than 128Mb of memory, and 128 for low memory machines.

net.ipv4.tcp_max_syn_backlog = 3240000

3. /proc/sys/net/core/somaxconn: Limit of socket listen() backlog, known in userspace as SOMAXCONN. Defaults to 128.

net.core.somaxconn = 3240000

vongosling

package com.alibaba.mq.internal.tools;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.Serializable;

import com.caucho.hessian.io.Hessian2Input;
import com.caucho.hessian.io.Hessian2Output;
import com.caucho.hessian.io.SerializerFactory;

vongosling

/** 
 * Result List based cursor theory 
 *  
 * @author vongosling 
 * @param <T> 
 */  
public class ResultCursorList<T> extends BaseDo {  
  
    private static final long serialVersionUID = -6593448580923210640L;  
    /**