From 152b2762c3710902e1a08af7ffdca2b8d44c5388 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mih=C3=A1ly=20Kuprivecz?= <mkuprivecz@gmail.com>
Date: Sat, 22 Apr 2017 17:16:38 +0200
Subject: [PATCH] read.me and the diagram is added

---
 event-queue/README.md                         |  29 ++++++++++++++
 event-queue/etc/event-queue.urm.puml          |  26 +++++++++++++
 event-queue/etc/model.png                     | Bin 0 -> 10815 bytes
 event-queue/model.png                         | Bin 0 -> 10815 bytes
 event-queue/model.ucls                        |  36 ++++++++++++++++++
 .../java/com/iluwatar/event/queue/Audio.java  |   9 +----
 6 files changed, 93 insertions(+), 7 deletions(-)
 create mode 100644 event-queue/etc/event-queue.urm.puml
 create mode 100644 event-queue/etc/model.png
 create mode 100644 event-queue/model.png
 create mode 100644 event-queue/model.ucls

diff --git a/event-queue/README.md b/event-queue/README.md
index e69de29bb..2129f8c69 100644
--- a/event-queue/README.md
+++ b/event-queue/README.md
@@ -0,0 +1,29 @@
+---
+layout: pattern
+title: Event Queue
+folder: event-queue
+permalink: /patterns/event-queue/
+categories: Concurrency
+tags:
+ - Java
+ - Difficulty Intermediate
+ - Queue
+---
+
+## Intent
+Event Queue is a good pattern if You have a limited accesibility resource (for example: 
+Audio or Database), but You need to handle all the requests that want to use that.
+It puts all the requests in a queue and process them asynchronously.
+Gives the resource for the event when it is the next in the queue and in same time
+removes it from the queue.
+
+![alt text](./etc/model.png "Event Queue")
+
+## Applicability
+Use the Event Queue pattern when
+
+* You have a limited accesibility resource and the asynchronous process is acceptable to reach that
+
+## Credits
+
+* [Mihály Kuprivecz - Event Queue]
diff --git a/event-queue/etc/event-queue.urm.puml b/event-queue/etc/event-queue.urm.puml
new file mode 100644
index 000000000..e2aabee31
--- /dev/null
+++ b/event-queue/etc/event-queue.urm.puml
@@ -0,0 +1,26 @@
+@startuml
+package com.iluwatar.event.queue {
+  class App {
+    + App()
+    + getAudioStream(filePath : String) : AudioInputStream {static}
+    + main(args : String[]) {static}
+  }
+  class Audio {
+    - MAX_PENDING : int {static}
+    - headIndex : int {static}
+    - pendingAudio : PlayMessage[] {static}
+    - tailIndex : int {static}
+    - updateThread : Thread {static}
+    + Audio()
+    + init() {static}
+    + playSound(stream : AudioInputStream, volume : float) {static}
+    + stopService() {static}
+    + update() {static}
+  }
+  class PlayMessage {
+    ~ stream : AudioInputStream
+    ~ volume : float
+    + PlayMessage()
+  }
+}
+@enduml
\ No newline at end of file
diff --git a/event-queue/etc/model.png b/event-queue/etc/model.png
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HcmV?d00001

diff --git a/event-queue/model.ucls b/event-queue/model.ucls
new file mode 100644
index 000000000..ed923014b
--- /dev/null
+++ b/event-queue/model.ucls
@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<class-diagram version="1.2.0" icons="true" automaticImage="PNG" always-add-relationships="false" generalizations="true" 
+  realizations="true" associations="true" dependencies="false" nesting-relationships="true" router="FAN">  
+  <class id="1" language="java" name="com.iluwatar.event.queue.Audio" project="event-queue" 
+    file="/event-queue/src/main/java/com/iluwatar/event/queue/Audio.java" binary="false" corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="285" y="179"/>    
+    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+      sort-features="false" accessors="true" visibility="true">      
+      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </class>  
+  <class id="2" language="java" name="com.iluwatar.event.queue.PlayMessage" project="event-queue" 
+    file="/event-queue/src/main/java/com/iluwatar/event/queue/PlayMessage.java" binary="false" corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="633" y="179"/>    
+    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+      sort-features="false" accessors="true" visibility="true">      
+      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </class>  
+  <association id="3">    
+    <end type="SOURCE" refId="1" navigable="false">      
+      <attribute id="4" name="pendingAudio"/>      
+      <multiplicity id="5" minimum="0" maximum="2147483647"/>    
+    </end>    
+    <end type="TARGET" refId="2" navigable="true"/>    
+    <display labels="true" multiplicity="true"/>  
+  </association>  
+  <classifier-display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+    sort-features="false" accessors="true" visibility="true">    
+    <attributes public="true" package="true" protected="true" private="true" static="true"/>    
+    <operations public="true" package="true" protected="true" private="true" static="true"/>  
+  </classifier-display>  
+  <association-display labels="true" multiplicity="true"/>
+</class-diagram>
\ No newline at end of file
diff --git a/event-queue/src/main/java/com/iluwatar/event/queue/Audio.java b/event-queue/src/main/java/com/iluwatar/event/queue/Audio.java
index a9f0c5a67..e00cd375a 100644
--- a/event-queue/src/main/java/com/iluwatar/event/queue/Audio.java
+++ b/event-queue/src/main/java/com/iluwatar/event/queue/Audio.java
@@ -47,10 +47,6 @@ public class Audio {
 
   private static PlayMessage[] pendingAudio = new PlayMessage[MAX_PENDING];
 
-  public static boolean isServiceRunning() {
-    return updateThread.isAlive();
-  }
-
   /**
    * This method stops the Update Method's thread. 
    */
@@ -117,6 +113,8 @@ public class Audio {
     try {
       clip = AudioSystem.getClip();
       clip.open(pendingAudio[headIndex].stream);
+      clip.start();
+      headIndex++;
     } catch (LineUnavailableException e) {
       System.err.println("Error occoured while loading the audio: The line is unavailable");
       e.printStackTrace();
@@ -124,8 +122,5 @@ public class Audio {
       System.err.println("Input/Output error while loading the audio");
       e.printStackTrace();
     }
-    clip.start();
-
-    headIndex++;
   }
 }