- Create
UNLOGGED
table. This reduces the amount of data written to persistent storage by up to 2x. - Set
WITH (autovacuum_enabled=false)
on the table. This saves CPU time and IO bandwidth on useless vacuuming of the table (since we neverDELETE
orUPDATE
the table). - Insert rows with
COPY FROM STDIN
. This is the fastest possible approach to insert rows into table. - Minimize the number of indexes in the table, since they slow down inserts. Usually an index
on
time timestamp with time zone
is enough. - Add
synchronous_commit = off
topostgresql.conf
. - Use table inheritance for fast removal of old data:
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/** | |
* A section to use in Recycler Adapter's. | |
* It holds a sectioned position for use in determining the offset of the adapter items. | |
*/ | |
data class AdapterSection(var firstPosition: Int, var title: String, var sectionedPosition: Int = 0) |
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(comment ; Fun with transducers, v2 | |
;; Still haven't found a brief + approachable overview of Clojure 1.7's new | |
;; transducers in the particular way I would have preferred myself - so here goes: | |
;;;; Definitions | |
;; Looking at the `reduce` docstring, we can define a 'reducing-fn' as: | |
(fn reducing-fn ([]) ([accumulation next-input])) -> new-accumulation | |
;; (The `[]` arity is actually optional; it's only used when calling | |
;; `reduce` w/o an init-accumulator). |
You can use this class to realize a simple sectioned RecyclerView.Adapter
without changing your code.
The RecyclerView
should use a LinearLayoutManager
.
You can use this code also with the TwoWayView
with the ListLayoutManager
(https://github.com/lucasr/twoway-view)
This is a porting of the class SimpleSectionedListAdapter
provided by Google
Example:
(by @andrestaltz)
If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.
I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!
\
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FROM ubuntu | |
MAINTAINER Eric Mill "eric@konklone.com" | |
# turn on universe packages | |
RUN echo "deb http://archive.ubuntu.com/ubuntu raring main universe" > /etc/apt/sources.list | |
RUN apt-get update | |
# basics | |
RUN apt-get install -y nginx openssh-server git-core openssh-client curl | |
RUN apt-get install -y nano |
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function dex-method-count() { | |
cat $1 | head -c 92 | tail -c 4 | hexdump -e '1/4 "%d\n"' | |
} | |
function dex-method-count-by-package() { | |
dir=$(mktemp -d -t dex) | |
baksmali $1 -o $dir | |
for pkg in `find $dir/* -type d`; do | |
smali $pkg -o $pkg/classes.dex | |
count=$(dex-method-count $pkg/classes.dex) | |
name=$(echo ${pkg:(${#dir} + 1)} | tr '/' '.') |
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// Copyright 2012 Square, Inc. | |
package com.squareup.widgets; | |
import android.content.Context; | |
import android.content.res.TypedArray; | |
import android.util.AttributeSet; | |
import android.widget.ImageView; | |
/** Maintains an aspect ratio based on either width or height. Disabled by default. */ | |
public class AspectRatioImageView extends ImageView { |
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