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#!/bin/bash | |
brew install redis # Install Redis using Homebrew | |
ln -sfv /usr/local/opt/redis/*.plist ~/Library/LaunchAgents # Enable Redis autostart | |
launchctl load ~/Library/LaunchAgents/homebrew.mxcl.redis.plist # Start Redis server via launchctl | |
# homebrew.mxcl.redis.plist contains reference to redis.conf file location: /usr/local/etc/redis.conf | |
redis-server /usr/local/etc/redis.conf # Start Redis server using configuration file, Ctrl+C to stop | |
redis-cli ping # Check if the Redis server is running |
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public protocol ResponseJSONObjectSerializable { | |
init?(json: SwiftyJSON.JSON) | |
} |
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import android.support.v7.widget.LinearLayoutManager; | |
import android.support.v7.widget.RecyclerView; | |
public abstract class EndlessRecyclerOnScrollListener extends RecyclerView.OnScrollListener { | |
public static String TAG = EndlessRecyclerOnScrollListener.class.getSimpleName(); | |
private int previousTotal = 0; // The total number of items in the dataset after the last load | |
private boolean loading = true; // True if we are still waiting for the last set of data to load. | |
private int visibleThreshold = 5; // The minimum amount of items to have below your current scroll position before loading more. | |
int firstVisibleItem, visibleItemCount, totalItemCount; |
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package com.yourco.yourapp; | |
import java.util.ArrayList; | |
import java.util.List; | |
import android.content.Context; | |
import android.view.LayoutInflater; | |
import android.view.View; | |
import android.view.ViewGroup; | |
import android.widget.BaseAdapter; |
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Latency Comparison Numbers (~2012) | |
---------------------------------- | |
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 3 us | |
Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |