wenzhihong2003

# Public Domain, i.e. feel free to copy/paste
# Considered a hack in Python 2

import inspect

def caller_name(skip=2):
    """Get a name of a caller in the format module.class.method
    
       `skip` specifies how many levels of stack to skip while getting caller
       name. skip=1 means "who calls me", skip=2 "who calls my caller" etc.

wenzhihong2003

package xxx;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import org.apache.oro.text.regex.MalformedPatternException;
import org.apache.oro.text.regex.Pattern;
import org.apache.oro.text.regex.Perl5Compiler;

wenzhihong2003

package xxx;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;
import java.net.URI;

wenzhihong2003

# Application dependencies

require:
    - com.gelinsoft -> app-base 1.4.7
    - com.gelinsoft -> play-excel 1.2.3
    - com.gelinsoft -> config 1.2.2
    - com.gelinsoft -> betterlogs 1.2i
    - com.gelinsoft -> aaa 1.7d
    - com.gelinsoft -> play-rythm 1.0-b5e
    - com.gelinsoft -> morphia 1.2.14

wenzhihong2003

package util.transaction;

import play.Logger;
import play.db.jpa.JPA;

public class TransactionRetryUtil {
    private static final int MAX_TRIED_TIMES = 15;
    public static <T> T run(TransactionCallback<T> callback) {
        for (int i = 0; i < MAX_TRIED_TIMES; i++) {
            try {

wenzhihong2003

Is socket.push(bytes) all you need to program Realtime Web apps?

One of the goals of Play2 architecture is to provide a programming model for what is called Realtime Web Applications.

Realtime Web Applications

Realtime Web Applications are applications that make use of Websockets, Server Sent Events, Comet or other protocols offering/simulating an open socket between the browser and the server for continuous communication. Basically, these applications let users work with information as it is published - without having to periodically ping the service.

There are quite a few web frameworks that target the development of this type of application: but usually the solution is to simply provide an API that allows developers to push/receive messages from/to an open channel, something like:

wenzhihong2003

Bits'bout Play2 Architecture

Play2 Simple HTTP API

Essential blueprint of Play2 architecture is pretty simple and it should be easy to explain in a fairly short blog post. The framework can be understood progressively at different levels; each time having better exposure to some aspects of its design.

The core of Play2 is really small, surrounded by a fair amount of useful APIs, services and structure to make Web Programming tasks easier.

Basically, Play2 is an API that abstractly have the folllowing type

wenzhihong2003

package org.nutz.lang.util;

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;

wenzhihong2003

# Application dependencies

require:
    - com.gelinsoft -> app-base 1.3.2
    - com.gelinsoft -> config 1.2.2
    - com.gelinsoft -> betterlogs 1.2i
    - com.gelinsoft -> aaa 1.2j
    # - play -> rythm 1.0.0-RC6
    - com.gelinsoft -> rythm 1.0.0-20120615
    #- play -> morphia 1.2.8-RC1