大约有 7,000 项符合查询结果(耗时:0.0121秒) [XML]
区块链技术到底是什么鬼,为何被疯炒? - 资讯 - 清泛网 - 专注C/C++及内核技术
...和节点之间相连形成了巨大的网络。
例如:A向周边节点广播:我要转账给B一个比特币。然后A将比特币的信息发给周边节点进行验证,周边节点确认A持有该比特币的合法性。当一定数量的节点验证通过后,交易成立,周边节点...
浅谈TCP优化 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...1460,所以「cwnd」的初始值是3MSS。
当我们浏览视频或者下载软件的时候,「cwnd」初始值的影响并不明显,这是因为传输的数据量比较大,时间比较长,相比之下,即便慢启动阶段「cwnd」初始值比较小,也会在相对很短的时间...
廉价共享存储解决方案1-drbd+ha+nfs - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ockdecho “/sbin/rpc.lockd” >>/etc/rc.local
5安装Heartbeat
5.1 下载安装包
由于实验机器没法上网 从网上下载Heartbeat的安装包并使用Xftp工具上传到share1和2
下载地址:
http://zhidao.baidu.com/link?url=_aPuZIb4MrknzzrITdXLToXoTORHa6EtT5-PxJsnZ89Heuzd...
Linux编译安装软件configure参数(持续更新) - 开源 & Github - 清泛网 - ...
Linux编译安装软件configure参数(持续更新)configure_paramPHP configure参数,Squid configure参数,MySQL configure参数,Postfix configure参数,Courier configure参数,Sasl2 configure参数 等。PHP configure参数:
./configure --prefix=/usr/local/php --with-gd=/usr/lo...
What is the difference between map and flatMap and a good use case for each?
... as well, i.e., N elements ==> N elements.
Using flatMap
>>> fm = data.flatMap(lambda line:line.split(" "));
>>> fm.collect()
[u'hadoop', u'is', u'fast', u'hive', u'is', u'sql', u'on', u'hdfs', u'spark', u'is', u'superfast', u'spark', u'is', u'awesome']
The output is differe...
Fragment is not being replaced but put on top of the previous one
...
You can clear backStack before replacing fragments:
FragmentManager fm = getActivity().getSupportFragmentManager();
for (int i = 0; i < fm.getBackStackEntryCount(); i++) {
fm.popBackStack();
}
// replace your fragments
...
How exactly to use Notification.Builder
...ager) getSystemService(Context.NOTIFICATION_SERVICE);
manager.notify(FM_NOTIFICATION_ID, builder.build());
}
// Remove notification
private void removeNotification() {
NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
manager...
Android微信智能心跳方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...性很低,现在国内Android上的Push基本上是各自为政,很多软件都自己实现Push。导致手机被经常性的唤醒,耗电耗流量严重。
市面上已经有很多第三方的公共推送服务,大家可以选择一个适合自己应用的推送服务。腾讯也有信鸽...
Call an activity method from a fragment
...ivity()).yourPublicMethod();
From activity to fragment:
FragmentManager fm = getSupportFragmentManager();
//if you added fragment via layout xml
YourFragmentClass fragment = (YourFragmentClass)fm.findFragmentById(R.id.your_fragment_id);
fragment.yourPublicMethod();
If you added fragment via co...
Duplicate ID, tag null, or parent id with another fragment for com.google.android.gms.maps.MapFragme
...) {
super.onViewCreated(view, savedInstanceState);
FragmentManager fm = getChildFragmentManager();
SupportMapFragment mapFragment = (SupportMapFragment) fm.findFragmentByTag("mapFragment");
if (mapFragment == null) {
mapFragment = new SupportMapFragment();
FragmentTra...
