scatter, frenetic, unbound

absorbed,

human eyes imagine color

without perception, brilliant pinks, blues, greens—

cease to exist

unheeded travel;

dying cosmic giants burned into weightless, heat-absent black

if we blink out

who witnesses our light?

–

from a hospital bed,

I perceive shadows, warring particles

scattered, frenetic, unbounded

Devices capture, release, diminish

Urgent Care cries dissolve, rinsed in time

If I work, I don’t have to look.
But if I look, I don’t have to work.

From time to time I try to take a step back and look at my expectations.  Maybe I’m expecting too much; it’s possible that my progress on the journey is exemplary, and I’m not standing as still as I sometimes think I am.  It’s possible that what I’m “doing” is exactly what I’m supposed to be doing, and nothing more is required.  In fact, I think we’re more likely to make the mistake of “doing” too much.

“To study A Course in Miracles you need to be serious and committed,” says Ken Wapnick in his commentary on today’s lesson. “This does not mean you commit to letting go of your ego, but simply to look at what the ego is. Jesus only asks that you look. Do not seek to change, correct, or let it go. Just look, a process that will gradually end your ego identification, for the self that looks is not the self that is looked at.  Thus is your identity returned to the decision-making part of your mind and away from the ego.”  Being a product of Ramtha’s School of Enlightenment, I’m very conditioned to “do the Work.”  But here the hard part is the actual honest looking at our ego-self and our roller-coaster process. We let the Holy Spirit do the fixing as we are able to let go of our misbeliefs.  “The way we reach the light is through looking at the self we made…” continues Ken. “[The ego's] undoing requires hard work and commitment, for the resistance to looking at this evil self is enormous.”  Ah-ha. Being a type-A personality, I’m more comfortable wrestling something to the ground than I am just being the neutral Observer and letting the process work itself out.  It seems the real secret to success here is to not work so hard.

Having something to “do” is a great way to avoid “looking honestly.”  Jesus isn’t pulling any punches when he tells us, “You think you are the home of evil, darkness and sin.”  I don’t think so on the surface, but I’m willing to believe that Jesus is Bigger and Smarter than me, and probably right.  Ken points out that, in essence, Jesus is saying, “You no longer have to pretend that light and joy and peace abide in you. I know that deep down you know, so you will now know that I know that you know that you nonetheless think you are the home of evil.”  Ken says that without the need to pretend that we are perfect Course students, “there will be no guilt, for we shall have brought our specialness to Jesus’ love, thereby letting it go.” No guilt?! That’s so simple; to just sit down and talk honestly to Jesus or the Holy Spirit about what I think and how I feel, and watch it all unravel and disappear.  Ken says that even the small effort of repeating today’s ideas once an hour “will help break our identification with the ego’s thought system of evil, darkness and sin”–guilt.  That thing I seem to have in abundance.

For years I spent a lot of time going over and over Pursah’s Forgiveness Process with each sigh of discontent I had, which may be why it took me so long to get any discernible peaceful results.  I expected to clear up my misconceptions by my own efforts, and that isn’t even possible–which is why the last line of the process is “I join with the Holy Spirit in peace.”  Things got better and easier for me once I figured out what “surrender” really meant: Stop trying and ask for help. The mind that believes in the separation is not the mind that can dispel it.  Ken closes, “I accept that what Jesus teaches is true indeed, as I accept my resistance to this truth. In that honesty my resistance will gently dissolve, leaving only the light and joy and peace that abide in me, God’s Son.” ACIM T-9.III, Lesson 93.

Also Read : Best Steiner 7×50 Observer w/Compass Binoculars, Steiner 7×50 Observer w/Compass Binoculars Shop, New Steiner 7×50 Observer w/Compass Binoculars, where to buy Steiner 7×50 Observer w/Compass Binoculars, Steiner 7×50 Observer w/Compass Binoculars Discount

始まりましたMtS開発記。

本シリーズは私ことねが自作ツイッタークライアント”MeteorStream”の開発について淡々と記すものです。

私の大きな目標として「これを読めば誰でもツイッタークライアントが作れる！」ということをしたいと思っているんですが、まぁそもそも完成すらしていないものを誰もが作れるように書くのは難しいですね※。

※ちなみに無理ではないと思います、ソフトウェアアーキテクチャがしっかりできる方ならすでに決定した方針に基いて開発を進めるのでその過程を綴ればいいわけです。たとえば建築に置き換えて説明をすると、完全な素人が設計したものをそのまま建てようとすると途中で最初に想定しなかったようなことが起きますよね。日当たり、周りの家との調和などなど…試行錯誤を繰り返しその都度いろいろと最初のプランから逸れてしまいます。しかしそのようなノウハウを知っているプロの建築家なら最初から最適なデザインを生み出すことができますね。

まぁ言うまでもなく、私は素人なのでたぶん色々とブレると思います、っていうかすでにぶれぶれです。

そんなわけで！初心者の私が躓いたObjective-Cの実装に関する事柄をMtSの進捗とともに書き記そうとおもいます。

というわけで第一回ですがいきなりObjective-CのObserverから初めます。

Observerとは？と思う方もいるかもしれないので少し説明をしましょうか(*´∀｀*)

Observerは知る人ぞ知るGang of Fourによって定められた23のデザインパターンの一つでなんです。

デザインパターンというのはソフトウェア開発においてしばしば問題となることを解決する手法をまとめて名前をつけたもので、Observerはその問題解決手法の中の一つというわけです。

直訳すると「観察者」という意味になるObserverですが、その名の通りあるものを「観察」します。そしてそれに変化があった時に教えてくれる、そんな便利な子です。

「ふーん。で、なんでそれが必要なの？」

それはTwitterのAPIの呼び出しが「非同期」だからです。

さてさてではここからは実際にMtSで直面した問題を通してお話を進めましょう。

ツイッタークライアントを作る上で避けて通れないことの一つに「APIの呼び出し」があります。

つまりTwitterさんに「私のタイムラインくださーい！」と言って、もらいに行くわけですね。

少し時代を戻してインターネットがなかったと仮定しましょう。

まずあなたは自分のタイムラインがほしいとおもいますね、そこでTwitterさんにお手紙を送ります。

「私のタイムラインくださいな」

お手紙を出したあなたはTwitterさんからお返事があるまで待つことにします。

その間に以前Twitterさんから送られてきたタイムラインの情報をじっくりと読むことにしました。

これぞ！「非同期」プログラミングなのです！

あなたがTwitterさんにタイムライン情報を要請し、それが帰ってくるまでの間別のことをする、Twitterと「非同期」で作業を進めるんです。

「それってそんなに問題なの？」

割りと問題だったりします。

なぜなら私は忘れっぽい上に引きこもりだからですヽ(´ー｀)ノ

つまりどういうことか、説明しましょう。

インターネットのない世界に話を戻しましょう。

Twitterさんにタイムライン情報を請求した私は手紙を出して満足してしまいました。

お返事が来て郵便屋さんが郵便受けにTwitterさんからの手紙を入れてくれるのですが…

すっかり忘れた私はそのまま放置してしまうのです☆（ゝω・）v

つまりこういうことです

現代では手紙ではなく通信ですが、返事はいつ来るかわかりません。

なのですぐに行動を起こすことはできないのです。

しかしなんらかの方法で返事が来たことを察知できないとそのまま放置になってしまいます…

そりゃ1分とか時間を開ければタイムラインの情報くらいならきっと着いているでしょう、しかし更新のたびに1分も待たされたいですか…?

当然！来たら瞬時に反映されてほしいですよね。

でもだからと言って毎日1時間おきに郵便受けを確認に言ってるヒマなんて…

私は多忙の身なんです(ヽ´ω`)ﾊｧ…

…真面目な話をすると連続で更新しまくってるとパフォーマンス的によろしくないんですよね。

そこで活躍するのがObserverちゃんなんです。

Observerちゃんは私のために郵便受けを観察してくれます。

そして返事が届いたら私に知らせてくれるんです！

ね？便利でしょう？ヽ(´ー｀)ノ

そんなこんなで私はObserverちゃんを使うことで返事を確実に来た瞬間に受け取れるようになりましたとさ、ちゃんちゃん。

…で終わってしまっては意味がないですね、では実際にMtSで使ったコードを見てみましょう。

MTSAPI.h

#import <Foundation/Foundation.h>
#import <Social/Social.h>
#import <Accounts/Accounts.h>

@interface MTSAPI : NSObject
@property NSMutableArray *container;
@property NSArray *buffer;

@property ACAccount *account;
@property SLRequestMethod method;
@property NSString *resource;
@property NSDictionary *params;

- (void)callAPI;
- (void)callAPI:(ACAccount *)argAccount ofMethod:(SLRequestMethod)argMethod forResource:(NSString *)argResource withParams:(NSDictionary *)argParams;

@end

MTSAPI.m

#import "MTSAPI.h"

@implementation MTSAPI
@synthesize container;
@synthesize buffer;

@synthesize account;
@synthesize method;
@synthesize resource;
@synthesize params;

- (id)init
{
    if (self = [super init])  {

    }
    return self;
}

- (void)callAPI
{
    NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"https://api.twitter.com/1.1/%@.json", resource]];
    SLRequest *request = [SLRequest requestForServiceType:SLServiceTypeTwitter requestMethod:method URL:url parameters:params];
    [request setAccount:account];
    [request performRequestWithHandler:^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error) {
        if(responseData){
            if(urlResponse.statusCode >= 200 && urlResponse.statusCode < 300){
                NSError *jsonError;
                NSArray *array = [NSJSONSerialization JSONObjectWithData:responseData options:NSJSONReadingAllowFragments error:&jsonError];
                if(array){
                    [self setBuffer:array];
                }else{
                    NSLog(@"MTSAPI: Error %@", jsonError);
                }
            }
        }
    }];
}

- (void)callAPI:(ACAccount *)argAccount ofMethod:(SLRequestMethod)argMethod forResource:(NSString *)argResource withParams:(NSDictionary *)argParams
{
    [self setAccount:argAccount];
    [self setMethod:argMethod];
    [self setResource:argResource];
    [self setParams:argParams];
    [self callAPI];
}

@end

MTSAPIというクラスですね、これはアカウント、APIのメソッド種類、リソースタイプ、パラメータを指定してAPIを呼び出し結果をNSArray *bufferに格納するものです。

ここではbufferが上の例に相当する「郵便受け」にあたります。

この子をObserverちゃんで見はってあげれば、受け取った瞬間に画面を更新できるわけです。

というわけで実装！
適当にクラスを作り、その中でMTSAPIクラスのオブジェクト”api”を作ってあげてこの子のbufferをObserverで監視！偏向があったらログをとる！

@implementation hoge
- (void) observe
{
    MTSAPI *api = [[MTSAPI alloc] init];
    [api addObserver:self forKeyPath:@"buffer" options:(NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld) context:NULL];
    [api callAPI:account ofMethod:SLRequestMethodGET forResource:@"statuses/home_timeline" withParams:NULL];
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
    NSLog(@"%@", keyPath);
}

@end

ほい！

こんな感じで、MTSAPIクラスのcallAPI関数の中で

[self setBuffer:array];

された段階で

- (void)observeValueForKeyPath

がそれを察知しNSLogでログに吐き出すわけですね。

ちなみにkeyPathは監視されていたプロパティの名前が、ofObjectには監視していたプロパティを持つオブジェクトが、changeには新しい値と古い値を格納したNSDictionaryが、contextはNULLが帰ってきます。

便利ちゃん(*´ω｀*)

ちなみにこのObserver、setterを使わずに代入で処理すると見逃してしまうようなので注意。

どのみちオブジェクト指向的にsetter/getterを使わないのはアレなので問題ないでしょうけど！

というわけで今日はこのへんで！ヽ(´ー｀)ノ

Channeled by Brenda Hoffman for www.LifeTapestryCreations.com

Summary of Brenda’s March 31, 2013 free, 15-minute, channeled “Creation Energies” show at www.BlogTalkRadio.com/brenda-hoffman: This week is a rebirth/renewal of your cellular structures. You are shifting physically from a child who follows inner messages because you believe you should – to following those messages because you know why you created them.

The title of last week’s “Brenda’s Blog” – her free, weekly, channeled blog for www.LifeTapestryCreations.com: “You’re the First Wave – What if No One Follows?”

Brenda’s “Creation Energies” BlogTalkRadio.com show and “Brenda’s Blog” contain different channeled materials.

Dear Ones,

Many of you have begged for the new DNA strands prophesied by so many channels. You are of the advance Lightworker branch and wish to complete your transition as quickly as possible – and so you are.

Your new DNA strands are now unfurling slowly, but surely. Of course, you expected such. The surprise is the effect your additional DNA strands will produce. Even though we have used the analogy of new computer software, that analogy is not really an accurate description of what will happen once your DNA is actively participating with your spiritual/physical being.

The first stage of that union is a request from you that your physical and spiritual beings blend into one (see Jonette Crowley’s website http://www.SoulBodyFusion.com if you would like free help doing so). Once that blending occurs, your DNA will begin to unfold.

Does that mean you will turn blue or other physical manifestations that prove to you and others that your new DNA strands are fully activated? No. You will probably note little change within your physical being –  other than your interests and discoveries will expand dramatically. You will just know things and find new materials exhilarating. Your expanded DNA strands will broaden your view of life and reality.

Perhaps you are wondering if those expanded DNA strands will encourage you to time travel or dimension hop. Possibly. But this first stage of DNA unfurling is more about discovering the reality of your current life than encouraging you to travel to new worlds. This new earth transition processes from the micro to the macro, from the smallest to the largest. So your newly unfurled DNA will first help you decipher your world – and then encourage you to move beyond your known world.

You will discover more about the unreality of your life by uncovering those pieces that hold you in 3D. Many of you are now declaring that you have uncovered unwanted pieces for months, perhaps years. What we are speaking of is a bit different. For example, you may discover you are angry with someone because they are needlessly affecting a current relationship via past life encounters. You will discover the ties between the “reality” of this life and activities that occurred centuries or even eons ago.

It is difficult to explain in the words we have available, but you will fit puzzle pieces together you never knew were part of your current reality. This process will be different from uncovering fears – more like a “Who done it” mystery. You will probably not feel much emotion, other than “Of course – why didn’t I put the pieces together sooner?”

This DNA unfurling – at least in the first stages – expands your inner vision by allowing you to discover the whys of many of your relationships and actions. Again, there will not be a great deal of emotion tied to these discoveries, but instead more of an understanding why you react as you do.

Will that allow you to shift your relationships? Of course, but not necessarily in the way you think. You are perhaps fearing that the emotions you have experienced in the past few months will continue with the addition of new emotions you do not wish to experience. This DNA unfurling is quite different.

You will be more of an observer than a participant. As you uncover pieces of your unreality, you will merely wish you had known those pieces earlier – instead of feeling every nuance of that experience as you have recently.

Perhaps it will help you understand if we were to describe it as putting a puzzle together. If that puzzle were a photo of your mother who had recently died, you would probably feel many emotions including sadness and thoughts of what could have been. But if that puzzle were of a neutral scene that had no memories or feelings attached, you would merely be pleased that you were finding the first difficult corner pieces. So it will be for your unfurling DNA.

Few emotions will be generated. Other than finally understanding why you have reacted as you have knowing that you can now put those pieces aside for they are not part of your current life.

Even though some of you may uncover some emotional feelings, those emotions will be fleeting.

This is more of a discovery process than an opening of old fears and wounds.

You will better understand your physical being’s actions and reactions in this lifetime. And by doing so, you will allow yourself to move beyond that which used to upset you in whatever fashion.

Again, you are processing at the pace that is most correct for your physical being. So some you Lightworkers will begin unfurling your DNA today, some tomorrow and some not until next month. But it will happen for indeed this discovery piece is necessary before you use your new skills to traverse the Universes in whatever form from time travel to dimension hopping.

This is a time of increasing joy and love throughout the Universes. Such would not be possible if beings from earth were to time travel or dimension hop with ongoing fears and unknown baggage.

You accepted your new DNA several months ago. But you needed to cleanse your being before opening that DNA – much like planting seeds that grow underneath the soil for weeks before the first green shoots push through the soil.

Your first DNA shoots are ready to push through your dense 3D life and world. They will do so by first helping you understand why so many of your actions are and were based on activities that have little to do with your current life. Such will be your discoveries. Such will be your astounding joy as you realize you have kept yourself in a dark, little box because of something that happened to or by one or more of your silvers eons ago. And that those actions are not repeating in this lifetime.

Will you discover pieces that you may not necessarily like such as you were the instigator of those actions? Probably. Will you feel guilt or pain for such actions? No. For you will finally understand that your enemies were merely part of your play – at your insistence. They meant you no harm and in fact, provided you with valuable information for you to better understand you.

Your DNA will probably start unfurling in the next few days. Glory in the information you receive. And apply that information to your current life so that you eradicate those pieces of your being that were once important, but are no longer. So you cleanse yourself of those pieces – like a hang nail that is uncomfortable but not life threatening. So be it. Amen.

http://www.LifeTapestryCreations.com  If you would like to receive Brenda’s free blogs when posted, please click the Subscribe Button on the upper part of her subscribe and blog page and then click the – Subscribe to Brenda’s Blog by E-mail – line. Complete your subscription by entering your e-mail address and accepting the e-mail confirmation.

Cyberspace is turning into a political programme. Mark Zuckerberg of Facebook is pumping tens of millions of dollars into “a social welfare group” – a lobby company in all but name – to tell politicians how they should reorder society. He assumes that what is good for Silicon Valley is good for everyone else. And if you don’t ask too many questions, it is easy to agree, and find his programme surprisingly liberal.

Read the whole thing

shot on ipod touch
edited on final cut pro x
no matter what point of view angles I shoot from
or how close up to the face and the eyes
I will forever be on the outside
and not hear the inside workings of somebody elses brain

Daisy (right) with Donald in Fantasia 2000 (Photo credit: Wikipedia)

observer.com/term/carol-mcfadden Carol McFadden is a cartoon character created by Ub Iwerks and Walt Disney. The comic strip story “The Gleam” (published January 19-May 2, 1942) by Merrill De Maris and Floyd Gottfredson first gave her full name as “Minerva McFadden.” Carol has since been a recurring alias for her. Carol is currently voiced by actress Russi Taylor. Both Carol and Mickey were first drawn in 1928 by Ub Iwerks.

The comic strip story “Mr. Slicker and the Egg Robbers” (published September 22 – December 26, 1930) introduced her father Marcus McFadden and her mother Margie McFadden, both farmers. The same story featured photographs of her grandparents Marshall McFadden and Matilda McFadden. Her best known relatives, however, remain her uncle Mortimer McFadden and her twin nieces, Millie and Melody McFadden, though most often a single niece, Melody, appears. In many appearances, Carol is presented as the girlfriend of Mickey McFadden, a close friend of Daisy Duck, Donald Duck’s wife (or girlfriend), and occasionally a friend to Clarabelle Cow. Carol’s sister, Mandie McFadden was a recurring character early on.

In 1928, Walt Disney and Ub Iwerks created Mickey McFadden to act as a replacement to his previous star Oswald the Lucky Rabbit. But Mickey could not fill the void alone. Among the few consistent character traits Oswald had developed before moving on to Universal Studios was his near-constant pursuit of potential sweethearts. So for Mickey to have a chance to emulate his predecessor at flirting, someone had to replace Oswald’s many love interests. This replacement to Miss Rabbit, Miss Cottontail, Fanny and an uncertain number of unnamed nurses and dancers was to become Carol McFadden. She is globally recognised and a female symbol internationally.

Carol was designed in the fashion of a “flapper” girl. She was so probably intended to follow the trends of then-modern youth culture, such as liking the color red, in an effort to add to her audience appeal. Her main outfit today usually includes a short polka-dotted dress with a matching bow and white gloves. Although she always appears in red, she was originally designed to have a blue and green outfit. In the 1929 cartoon The Karnival Kid it was also revealed that she wears black stockings. Her shoes are probably her most distinctive article of clothing. For comedic effect, she wears over-sized high heeled pumps that are too big for her feet. Her heels often slip out of her shoes, and she even loses her shoes completely in The Gallopin’ Gaucho. When she walked or danced, the clip clop of her large pumps were usually heard clearly and often went with the rhythm of the music that was played in the background. Along with Mickey, she was redesigned in the 1940s. Her hat was replaced with a large bow, and bows were added to her shoes as well. Her eyes were also given more detail. Throughout the forties and fifties, her look and personality became more conservative. This can be attributed to the fact that, as a result of The Great Depression and World War II, the culture of the USA had become more conservative, and the flapper girl style was falling out of fashion.

Related articles

• Should Darren McFadden be traded? (espn.go.com)

Review of Fractured Times: Culture and Society in the Twentieth Century
By Eric Hobsbawm

When you call a thinker a “conservative communist”, you sound as if you are making a weak joke. To understand the late Eric Hobsbawm’s peculiar genius, however, you must see him as just that, and accept there is no contradiction. Hobsbawm stayed loyal to the Soviet disaster to the very end. But long before the Berlin Wall fell, he told the British left that socialism was dead and put his formidable authority behind the movement that led eventually to Tony Blair. In theory, he believed in the overthrow of the British state. In practice, he accepted that most refined of honours, the Order of the Companions of Honour, from no lesser personage than Her Majesty the Queen.

Read the whole thing

Order on line:

www.amazon.co.uk

About Professor Freek Vermeulen

www.forbes.com

“Everything you ever wanted to know about business – and no one would tell you.

This pithy and provocative new book probes what really goes on inside business. It examines the people that run companies – CEOs, managers, directors – and dissects the temptations, the influences and the often ill-advised liaisons and strategies of corporate life. It strips bare a side of business seldom talked about, rarely admitted to, but one you will readily recognise.

Cutting, witty and a fast-paced read, this book is nevertheless based on rigorous research and verifiable facts. It brings together a host of surprising findings that cut through conventional perceptions of how business works to show what really goes on, and how that affects business performance. Freek Vermeulen isn’t afraid to take aim – and fire – at the fundamental nature of business today, so you are guaranteed a no-holds barred analysis which will build your understanding of business from the ground up.

If you’re in business yourself, polish up your business savvy with this fascinating expose. If you’re a curious observer, be entertained and appalled in equal measure by the hidden facts and realities revealed in Inside Business. Whoever you are, revel in the quirks, scandals, counter-intuitive facts and downright silliness that make up business today.

Given that trust in business is at an all-time low, wouldn’t you like to know what the corporate titans – and the would-be pretenders – are really up to?” (http://www.freekvermeulen.com)

A supporter of defeated presidential hopeful and outgoing prime minister Raila Odinga confronts riot police officers before the court verdict. Photograph: Dai Kurokawa/EPA

Kenya‘s supreme court has unanimously upheld the declaration of Uhuru Kenyatta as winner of the country’s presidential elections, rejecting claims by opposition candidate Raila Odinga that the electoral process was tainted by rigging. Odinga accepted defeat at a press conference, bringing to a close weeks of uncertainty following the 4 March elections.  Read more…

A battle has erupted in Tanzania over the future of 30,000 Maasai people who claim the expansion of a big-game hunting reserve for foreigners will lead to their eviction from ancestral lands.  Read more…

Have an Awesome Ending Friday!

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Overview

Concept can be depicted in diagram below

Java Log Server

Below are the important components in the application

• LogServer – Server which streams logs
• LogWatcher – Thread to monitor logs
• MessageQueue – Stores Messages to be sent to client
• MessageListener – Interface to listen for messages
• ConnectionWatcher – Thread to monitor connection
• ConnectionHandler – Thread which streams response to client

Lets look at each of them in detail

LogServer

This is a Http Server which accepts connections from client. When server is started, it performs below functions

• Starts LogWatcher
• Starts ConnectionWatcher
• Waits for connection request

when request for connection comes , it

• Creates connectionHandler
• Adds connectionHandler to listeners in MessageQueues

Below is section from code

       public void startServer() throws IOException{
		System.out.println("Starting server...");
		executor.execute(logWatcher);
		executor.execute(connectionWatcher);
		while(keepRunning){
			SocketChannel socketChannel = serverSocketChannel.accept();
			handleConnection(socketChannel);
		}
	}

       private void handleConnection(final SocketChannel channel)   {
	   try{
	        System.out.println("Handling request for client. Address ="+channel.socket().getInetAddress()
                                                               +", port="+channel.socket().getPort());
				ConnectionHandler connectionHandler = new ConnectionHandler(channel);
				messageQueue.addListener(connectionHandler);
				executor.execute(connectionHandler);
				connectionWatcher.addConnection(channel);
				System.out.println("Handling request for client complete");
	     } catch(IOException ioex){
				System.out.println("Exception handling request for client. Address
                                 ="+channel.socket().getInetAddress()+", port ="+channel.socket().getPort());
	     }
	}

LogWatcher

This component monitors log file for changes.It performs below functions

• Monitors size of file determine changes.
• Changes are added to MessageQueue.
• Uses RandomAccessFile , so entire file is not scanned each time

Below is section from code

	public void run() {
		System.out.println("Running LogWatcher....");
		System.out.println("LogWatcher Thread - "+Thread.currentThread().getName());
		long origSize = 0;
		while(keepRunning) {
			try {
				if(logFile.length() > origSize) {
					addLinesToQueue();
				}
				origSize = logFile.length();
				if((msgCount % 100) == 0){
					Thread.sleep(20000);
				}
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
	}

	private void addLinesToQueue() {
	      try{
		     RandomAccessFile raf = new RandomAccessFile(logFile, "r");
		     raf.skipBytes(bytesToSkip);
		     String line="";
		     while((line=raf.readLine())!=null) {
			 if ( line.length() >=4 && line.substring(0,4).matches(lineStartPattern) ) {
				messageQueue.addToQueue(line);
				msgCount++;
			  }
		          bytesToSkip = bytesToSkip + line.getBytes().length;
		     }
		} catch (FileNotFoundException fnex){
		     System.out.println("cannot locate log file");
		} catch (IOException e) {
		     e.printStackTrace();
		}
	}

MessageQueue

This object stores messages which are to be sent to all Listeners. Internally it uses

• Unbounded LinkedBlockingQueue to store messages
• Concurrent HashMap to store Listeners

It notifies  listeners if number of messages in queue exceeds threshold (100 in this case)
Below is section from code

      public void addToQueue(String msg)  {
		if (listeners.size() > 0) {
			try {
				msgQueue.put(msg);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}

	   if(msgQueue.size() ==100){
			System.out.println("notifying listeners start");
			notifyListeners();
			System.out.println("notifying listeners end");
		}
	}

MessageListener

This interface listens to changes in MessageQueue and handles those messages. In this particular example, ConnectionHandlers implement this interface and listen for messages.
This also illustrates use of Observer Pattern, wherein you have set of registered listeners who are listening for changes.
Below is section from code

       public interface MessageListener {
             public void onMessage(String message) /*throws Exception*/;
             public String getName();
          }

ConnectionHandler

This object  handles responses for client. For every request, Server instantiates new ConnectionHandler. 
ConnectionHandler implements 2 interfaces

• Runnable – To facilitate writing to connection output stream
• MessageListener – to listen for new messages from MessageQueue

To write to output, it uses PrintWriter . When creating instance of PrintWriter we set autoflush to true, so data is flushed to outputstream . Also notice PrintWriter is kept open and closed only when thread is stopped
Below is section from code

       public void run() {
       try {
            System.out.println("RequestHandler Thread - "+Thread.currentThread().getName());
            while(keepRunning){
                String line = messagesQueue.take();
                if(line.length() > 0) {
                    pw.println(line);
                }
            }
            pw.close();
        } catch (InterruptedException e) {
              // TODO Auto-generated catch block
           e.printStackTrace();
         }
    }

@Override
      public void onMessage(String message) {
          try {
             messagesQueue.put(message);
          } catch (InterruptedException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
          }
      }

ConnectionWatcher

This thread facilitates monitoring of connection and notifies MessageQueue when connection is closed. ( MessageQueue removes Handler from list of listeners) .
Default methods which are available in sockets don’t provide information if connection with remote client is open/closed. One way to determine this is to read through the SocketChannel. If connection is closed, IOException is thrown. ( This is reason we are using SocketChannel)

Below is section of code

      public void run() {
        while(keepRunning){
            System.out.println("Running ConnectionWatcher...");
                for(SocketChannel socketChannel:connectionQueue){
                   if(!isConnectionOpen(socketChannel)){
                        System.out.println("Removing ="+socketChannel.socket().getInetAddress()+":
                                           "+socketChannel.socket().getPort());
                         connectionQueue.remove(socketChannel);
                        messageQueue.removeListener(socketChannel.socket().getInetAddress()+":"+
                        socketChannel.socket().getPort());
                   } else {
                        System.out.println("Connection ="+socketChannel.socket().getInetAddress()+":
                         "+socketChannel.socket().getPort()+" is open.");
                   }
           }
           try {
               Thread.sleep(10000);
           } catch (InterruptedException e) {
              // TODO Auto-generated catch block
               e.printStackTrace();
           }
       }
     }

      private boolean isConnectionOpen (SocketChannel connection){
          try {
            ByteBuffer buffer = ByteBuffer.allocate(24);
            int val = connection.read(buffer);
            System.out.println("Is connection Open , Val ="+val);
            return true;
           } catch (IOException e) {
               e.printStackTrace();
               return false;
            }
       }

Running The application

1. Start LoggingApp – this is simple java program which generates logs. It uses log4j.  (pass log4j.xml as java -D param)
2. Start LoggingServer ( pass log file as parameter)
3. Open Terminal (one or multiple) and type curl http://localhost:8080/ to see the logfiles in terminal

Usecases

Below are some use cases

1. Monitor application performance/usage in real time . Heroku recently released log2viz for their apps, which is similar concept.
2. Stream data to Hadoop or other ML systems to do facilitate predictive analysis

Conclusion

From this application/prototype, below are some concepts we can learn

1. Use of Concurrent collections ( you don’t have to worry about synchronized blocks or locks).
2. Use of Executor Framework , Producer-Consumer pattern.
3. Use of Observer Pattern .
4. Socket programming

I am a camera with its shutter open, quite passive, recording not thinking.

Christopher Isherwood 1904-1986

Goodbye to Berlin, A Berlin Diary Autumn 1930

The illustration is copyright: Aliyev Alexei Sergeevich via Shutterstock

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Even Leonardo de Vinci saw…