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git diff --name-only --diff-filter=AM origin/master | \
xargs bundle exec rubocop --display-cop-names --extra-details --parallel --force-exclusion

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use std::thread;
use std::thread::JoinHandle;
use std::sync::{Arc, Mutex, MutexGuard};

type Node = Arc<Mutex<TreeNode>>;

#[derive(Debug)]
struct TreeNode {
    value: u16,
    children: Vec<Node>,

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--lock monitor
CREATE VIEW lock_monitor AS(
SELECT
  COALESCE(blockingl.relation::regclass::text,blockingl.locktype) as locked_item,
  now() - blockeda.query_start AS waiting_duration, blockeda.pid AS blocked_pid,
  blockeda.query as blocked_query, blockedl.mode as blocked_mode,
  blockinga.pid AS blocking_pid, blockinga.query as blocking_query,
  blockingl.mode as blocking_mode
FROM pg_catalog.pg_locks blockedl
JOIN pg_stat_activity blockeda ON blockedl.pid = blockeda.pid

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SELECT
  pg_cancel_backend(pid),
  now()-pg_stat_activity.query_start AS duration,
  query,
  state
FROM pg_stat_activity
WHERE (now()-pg_stat_activity.query_start) > interval '1 day';
SELECT pg_sleep(30);
SELECT
  pg_terminate_backend(pid),

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#! /usr/bin/env bash

CMD="${1?valid commands are psql, seed, create, drop, reset}"

set -eux pipefail

export $(sed '/^#/ d' .env)
HOST="${DB_HOST-localhost}"
USERNAME="${DB_USERNAME-postgres}"
PASSWORD="${DB_PASSWORD-postgres}"

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{
  "fromUserName": "Axel Lidenbrock",
  "message": "Welcome to the center of the earth",
  "chatroom": "foyer"
}

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ws.onopen = function () {
  if (ws.protocol == 'appProtocol-v2') { 
    ...
  } else {
    ...
  }
}

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const WebSocket = require('ws');

const server = new WebSocket.Server({ port: 8080 });

server.on('connection', function connection(ws) {
  ws.send('connected')

  ws.on('message', function incoming(message) {
    ws.send('something');
  });

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      var websocket = new WebSocket('ws://echo.websocket.org/');

      websocket.onopen = function(e) {
        console.log('socket open');
      }

      websocket.onmessage = function (e){
        console.log(e.data)
      };

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class AddColumnUsersIsAdmin < ActiveRecord::Migration
  phase :pre_restart

  def change
    add_column :users, :is_admin, :boolean
  end
end

class BackfillUsersIsAdminNoLock < ActiveRecord::Migration
  phase :post_restart