discovery

Android Network Discovery Service (ish) before API 14

折月煮酒 提交于 2019-11-29 15:44:56
问题 I need to be able to discover the services on the local network (so say I am running a chat application and I want to discover other devices on local network running this chat), but sadly I need to be able to use it on devices with API < 16 (so I cannot use android.net.nsd) I am sure this can be done without using NSD API. Question is how. Any help? 回答1: There are at least three or four options. You can use TCP or UDP Broadcast address Multicast address Iterate over all adresses in your

Identify a non-computer network device?

落花浮王杯 提交于 2019-11-29 04:37:54
I'm current working on a program that scans my network and discoveres computers and devices on the network. I use various operations to find data on the devices I discover, but want to distinguish the network devices from computers. And I'm wondering if anyone knows how I could do this? I looked a bit at SNMP, and tried connecting to my network printer, router and modem. But I seem to only be able to connect to the printer, neither the router or modem responds. Is there another way to identify what kind of a device an IP address belongs to? Using a command line tool such as nmap you can finger

Android 6.0 - Bluetooth - No code exists for Action_Found broadcast intent

有些话、适合烂在心里 提交于 2019-11-29 04:35:41
UPDATE I tried many codes, also from examples shown on the internet. each of them follows my approach. After many hours of testing, i came to the conclusion that on Android 6.0 there's no chance to achieve bluetooth discovery of unknown devices, we can only retrieve the bonded ones. I'm pretty sure there's something with this android version. if someone knows how to fix this, i would really appreciate any help. Original Post My code is working fine, but no devices get found. i only receive DISCOVERY_STARTED and DISCOVERY_FINISHED, so no devices are found, but using system app these devices get

How do I discover RESTful Web services?

心已入冬 提交于 2019-11-29 00:05:44
问题 When I want to find a "Big" Web service (WS-*/WSDL based) of required functionality I can simply google for ".... filetype:wsdl" because Google indexes also WSDL definitions. Or I can simply use some registries that already crawled the Web for WSDL definitions for me, e.g. SeekDa.com or ServiceFinder. When I want to find RESTful Web service (RESTful Web API) I may count only on the community, because it is not possible to distinguish between URI of RESTful Web service and other Web resources

Discovery of Causal Time Intervals.

自作多情 提交于 2019-11-28 20:51:47
Discovery of Causal Time Intervals. 推荐论文: Discovery of Causal Time Intervals 对时序因果关系的 Granger causality test 的一种剪枝优化。 PcAlg算法 相关论文下载  Download 提取码:8ymj 原Git地址 目前还是初学者呢,前置技能还是要多学 喜欢这篇文章吗,不妨分享给朋友们吧! 来源: https://blog.csdn.net/qq_18797303/article/details/100129093

ETCD配置内容详解

孤街浪徒 提交于 2019-11-28 19:33:34
ETCD配置内容含义详解 2.1 成员相关标识 --name 含义:此成员的名称。 默认值:default 环境变量:ETCD_NAME 作用:此配置值作为此节点在--initial-cluster标志中列出的条目(例如,default=http://localhost:2380)引用。若使用静态引导,则需要匹配标志中使用的密钥。使用发现时,每个成员必须具有唯一的名称。建议使用Hostname或者machine-id。 注意:使用发现时,每个成员必须具有唯一的名称。 --data-dir 含义:服务运行数据保存的路径。 默认值:${name}.etcd 环境变量:ETCD_DATA_DIR 作用:设置数据保存的目录。 --wal-dir 含义:专用wal目录的路径。 默认值:--data-dir的路径下 环境变量:ETCD_WAL_DIR 作用:独立设置wal目录,etcd会将WAL文件写入--wal-dir而不是--data-dir。独立的wal路径,有助于避免日志记录和其他IO操作之间的竞争。 --snapshot-count 含义:触发快照到磁盘的已提交事务数。 默认值:100000 环境变量:ETCD_SNAPSHOT_COUNT 作用:指定有多少事务(transaction)被提交时,触发截取快照保存到磁盘。 --heartbeat-interval 含义:心跳间隔的时间

etcd配置参数详解

眉间皱痕 提交于 2019-11-28 19:33:04
针对ETCD版本 3.2.17 --name 节点名称 default: "default" env variable: ETCD_NAME 这个值和--initial-cluster flag (e.g., default= http://localhost:2380)中的key值一一对应,如果在集群环境中,name必须是唯一的,建议用主机名称或者机器ID 。 --data-dir 数据存储目录 default: "${name}.etcd" env variable: ETCD_DATA_DIR --wal-dir default: "" env variable: ETCD_WAL_DIR 存放预写式日志,最大的作用是记录了整个数据变化的全部历程。未设置,共用--data-dir文件所在目录。 --snapshot-count default: "100000" env variable: ETCD_SNAPSHOT_COUNT 数据快照触发数量,etcd处理指定的次数的事务提交后,生产数据快照 --heartbeat-interval 客户端连接后的心跳间隔(毫秒) default: "100" env variable: ETCD_HEARTBEAT_INTERVAL --election-timeout 集群选举的超时时间 default: "1000" env

ETCD原理

六月ゝ 毕业季﹏ 提交于 2019-11-28 19:28:19
etcd:从应用场景到实现原理的全方位解读 从etcd的架构开始,深入到源码中解析etcd 1 架构 从etcd的架构图中我们可以看到,etcd主要分为四个部分。 HTTP Server: 用于处理用户发送的API请求以及其它etcd节点的同步与心跳信息请求。 Store:用于处理etcd支持的各类功能的事务,包括数据索引、节点状态变更、监控与反馈、事件处理与执行等等,是etcd对用户提供的大多数API功能的具体实现。 Raft:Raft强一致性算法的具体实现,是etcd的核心。 WAL:Write Ahead Log(预写式日志),是etcd的数据存储方式。除了在内存中存有所有数据的状态以及节点的索引以外,etcd就通过WAL进行持久化存储。WAL中,所有的数据提交前都会事先记录日志。Snapshot是为了防止数据过多而进行的状态快照;Entry表示存储的具体日志内容。 通常,一个用户的请求发送过来,会经由HTTP Server转发给Store进行具体的事务处理 如果涉及到节点的修改,则交给Raft模块进行状态的变更、日志的记录,然后再同步给别的etcd节点以确认数据提交 最后进行数据的提交,再次同步。 2 新版etcd重要变更列表 获得了IANA认证的端口,2379用于客户端通信,2380用于节点通信,与原先的(4001 peers / 7001 clients)共用。

RESTful API runtime discoverability / HATEOAS client design

人走茶凉 提交于 2019-11-28 13:27:51
问题 For a SaaS startup I'm involved in, I am building both a RESTful web API and a couple of client apps on different platforms that consume it. I think I've got the API figured out, but now I'm turning to the clients. As I've been reading about REST, I see that a key part of REST is discovery , but there seems to be a lot of debate between two different interpretations of what discovery really means: Developer discovery : The developer hard-codes copious amounts of API details into the client,

Network discovery in Java using multicasting

邮差的信 提交于 2019-11-28 06:30:00
I'm trying to make a client/server Java App. Both client and server will be running on the same wi-fi network. Server will be running on a specific port that client is aware of. I am planning to send a multicast message from client through the network for that specific port to discover the server. However, I'm not too sure how I can find out which IP in my network received my message. Do I need to create a socket on the client and listen to incoming packets once I send my multicast message in case server replies back? Thanks in advance. (1)server listens on a pre-arranged port DatagramSocket s