michail-nikolaev’s gists

michail-nikolaev / build.gradle

Created September 9, 2012 22:47

Gradle - base file using Spring

michail-nikolaev / gist:3687820

Created September 9, 2012 22:56

Java - Guava - Memory Cache

	private Cache<String, String> cache = CacheBuilder.newBuilder()
	.concurrencyLevel(4)
	.weakKeys() // check this
	.maximumSize(10000)
	.expireAfterWrite(10, TimeUnit.MINUTES)
	.build();

michail-nikolaev / latency.txt

Created September 9, 2012 22:58 — forked from jboner/latency.txt

Latency Numbers Every Programmer Should Know

	Latency Comparison Numbers
	--------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns
	Send 1K bytes over 1 Gbps network 10,000 ns 0.01 ms
	Read 4K randomly from SSD* 150,000 ns 0.15 ms

michail-nikolaev / gist:3687870

Created September 9, 2012 23:10

Bash - simple parallel processing of files with markers

	#!/bin/bash

	#first argument - process number (from 0 to N)
	#second argument - number of parallel processed (N)

	#./script.sh 0 6
	#./script.sh 1 6
	#...
	#./script.sh 5 6

michail-nikolaev / gist:3701729

Created September 11, 2012 20:22

PotsgreSQL - global replace punctions via regexp

select regexp_replace(name, '[[:punct:]]', '', 'g') from company  where type = 'LIST'

michail-nikolaev / gist:3706554

Created September 12, 2012 13:21

PostgreSQL - Ubuntu - Install for remote access

	apt-get install python-software-properties
	add-apt-repository ppa:pitti/postgresql
	apt-get update
	apt-get install postgresql-9.2


	/etc/postgresql/9.2/main
	postgresql.conf:
	data_directory = '/var/lib/postgresql/9.2/main'
	listen_addresses = '*'

michail-nikolaev / httpd.conf

Created September 13, 2012 13:55

Apache 2 - HTTPS proxy

	/etc/apache2/httpd.conf

	LoadModule proxy_module /usr/lib/apache2/modules/mod_proxy.so
	LoadModule proxy_http_module /usr/lib/apache2/modules/mod_proxy_http.so
	LoadModule ssl_module /usr/lib/apache2/modules/mod_ssl.so
	ServerName example.com

	<VirtualHost *:443>
	ProxyPreserveHost On
	ServerName example.com

michail-nikolaev / checkstyle.xml

Last active October 10, 2015 16:58

IDEA - formatter rules

	<?xml version="1.0" encoding="UTF-8"?>
	<code_scheme name="Itransition">
	<option name="LINE_SEPARATOR" value=" " />
	<option name="CLASS_COUNT_TO_USE_IMPORT_ON_DEMAND" value="1000" />
	<option name="NAMES_COUNT_TO_USE_IMPORT_ON_DEMAND" value="1000" />
	<option name="PACKAGES_TO_USE_IMPORT_ON_DEMAND">
	<value />
	</option>
	<option name="WRAP_COMMENTS" value="true" />
	<XML>

michail-nikolaev / gist:3754966

Created September 20, 2012 09:46

CDI - inject all beans with Qualifier

	@Qualifier @Target({ ElementType.TYPE, ElementType.METHOD, ElementType.FIELD }) @Retention(RetentionPolicy.RUNTIME)
	public @interface Active {
	}

	@Active
	public class SomeBeanA implements SomeInterface {
	}
	@Active
	public class SomeBeanB implements SomeInterface {
	}

michail-nikolaev / gist:3761054

Created September 21, 2012 11:52

PostgreSQL - info about locks

	-- select * from pg_locks

	-- select * from pg_stat_activity

	select distinct on (locktype,datname,mode,relname,query) locktype,datname,relation,tuple,mode,relname,query from pg_locks as l
	join pg_stat_activity as a on (a.datid=l.database and a.pid=l.pid)
	join pg_class as c on (c.oid=relation)

	where query not like '%pg_stat_activity%'

Michail Nikolaev michail-nikolaev