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<td id="header-avatar-image-container" valign="top" style="padding: 0px; border-collapse: collapse; vertical-align: top; width: 32px; padding-right: 9px"><a href="https://wiki.asterisk.org/wiki/display/~mmichelson?src=email" style="color: #3b73af; text-decoration: none"><img id="header-avatar-image" class="image_fix" src="cid:avatar_99ed0aa29d6f204db4785296f8170422" height="32" width="32" border="0" style="border-radius: 3px; vertical-align: top" /></a></td>
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<td class="notification-comment-pattern-container mobile-resize-text" style="padding: 0px; border-collapse: collapse; padding: 0px"><strong>Change comment:</strong> Added missing javascript state machine.</td>
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<td id="page-title-pattern-icon-image-container-cell" style="padding: 0px; border-collapse: collapse; width: 16px; padding: 9px 8px 0px 0px; mso-text-raise: 5px; mso-line-height-rule: exactly"><a href="https://wiki.asterisk.org/wiki/pages/viewpage.action?pageId=29396202&src=email" title="page icon" style="vertical-align: top;; color: #3b73af; text-decoration: none"><img style="vertical-align: top; display: block;" src="cid:page-icon" alt="page icon" title="page icon" height="16" width="16" border="0" /></a></td>
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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" id="page-title-pattern-header-container"><span id="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"><a href="https://wiki.asterisk.org/wiki/pages/viewpage.action?pageId=29396202&src=email" title="MEDIA? MORE LIKE MEDI-DUH!" style="color: #3b73af; text-decoration: none">MEDIA? MORE LIKE MEDI-DUH!</a></span></td>
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<td class="content-excerpt-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 0 24px"> <p class="diff-context-placeholder" style="margin: 10px 0 0 0; margin-top: 0">...</p>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB/5635/60fd2eb45debbf4ede2b669f4c9b96b4ce40a937.48/_/plugins/servlet/confluence/placeholder/macro-icon?name=code" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</th>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">event.js</td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">collapse</td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">true</td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">var Event = {
// DTMF digits
DTMF_1: "1",
DTMF_2: "2",
DTMF_3: "3",
DTMF_4: "4",
DTMF_5: "5",
DTMF_6: "6",
DTMF_7: "7",
DTMF_8: "8",
DTMF_9: "9",
DTMF_0: "0",
// Use "octothorpe" so there is no confusion about "pound" or "hash"
// terminology.
DTMF_OCTOTHORPE: "#",
DTMF_STAR: "*",
// Call has hung up
HANGUP: "hangup",
// Playback of a file has completed
PLAYBACK_COMPLETE: "playback_complete",
// Mailbox has been emptied
MAILBOX_EMPTY: "empty"
}
module.exports = Event;</pre> </td>
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</table> <p class="diff-block-target" style="margin: 10px 0 0 0"> <span class="diff-html-removed" id="removed-diff-0" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span> </p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0">There is no hard requirement <span class="diff-html-added" id="added-diff-0" style="font-size: 100%; background-color: #ddfade;">for our application </span>that we define events as named constants, but doing so makes it easier for tools like pylint and jslint to find potential mistakes.</p> <p class="diff-block-target" style="margin: 10px 0 0 0">After we have defined our events, we need to create a state machine itself. The state machine keeps track of what <span class="diff-html-removed" id="removed-diff-1" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">states exist, what </span>the current state is, and which <span class="diff-html-removed" id="removed-diff-2" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">states </span>events cause <span class="diff-html-removed" id="removed-diff-3" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">the program to transition to</span><span class="diff-html-added" id="added-diff-1" style="font-size: 100%; background-color: #ddfade;">state changes</span>. Here is a simple implementation of a state machine</p>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">title</td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">state_machine.py</td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">language</td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">py</td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">collapse</td>
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">true</td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">class StateMachine(object):
def __init__(self):
self.transitions = {}
self.current_state = None
def add_transition(self, src_state, event, dst_state):
if not self.transitions.get(src_state.state_name):
self.transitions[src_state.state_name] = {}
self.transitions[src_state.state_name][event] = dst_state
def change_state(self, event):
self.current_state = self.transitions[self.current_state.state_name][event]
self.current_state.enter()
def start(self, initial_state):
self.current_state = initial_state
self.current_state.enter()</pre> </td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">state_machine.js</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">js</span></td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">true</span></td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">var StateMachine = function() {
this.transitions = {};
this.current_state = null;
}
StateMachine.prototype.add_transition = function(src_state, event, dst_state) {
if (!this.transitions.hasOwnProperty(src_state.state_name)) {
this.transitions[src_state.state_name] = {};
}
this.transitions[src_state.state_name][event] = dst_state;
}
StateMachine.prototype.change_state = function(event) {
this.current_state = this.transitions[this.current_state.state_name][event];
this.current_state.enter();
}
StateMachine.prototype.start = function(initial_state) {
this.current_state = initial_state;
this.current_state.enter();
}
module.exports = StateMachine;</span>
</pre> </td>
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</table> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0">The state machine code is pretty straightforward. The state machine <span class="diff-html-removed" id="removed-diff-4" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">is defined and </span>has <span class="diff-html-removed" id="removed-diff-5" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">transtions </span><span class="diff-html-added" id="added-diff-3" style="font-size: 100%; background-color: #ddfade;">transitions </span>added to it with the <code style="font-family: monospace">add_transition()</code> method <span class="diff-html-removed" id="removed-diff-6" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">. The state machine </span><span class="diff-html-added" id="added-diff-4" style="font-size: 100%; background-color: #ddfade;">and </span>can be started with the <code style="font-family: monospace">start()</code> method. Our use of the state machine will always be to define all <span class="diff-html-removed" id="removed-diff-7" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">transtions up front</span><span class="diff-html-added" id="added-diff-5" style="font-size: 100%; background-color: #ddfade;">transitions</span>, <span class="diff-html-added" id="added-diff-6" style="font-size: 100%; background-color: #ddfade;">and </span>then <span class="diff-html-added" id="added-diff-7" style="font-size: 100%; background-color: #ddfade;">to </span>start the state machine.</p> <h3 id="MEDIA?MORELIKEMEDI-DUH!-States" class="diff-block-context" style="margin: 10px 0 0 0; font-size: 16px; line-height: 25px; margin: 30px 0 0 0">States</h3> <p class="diff-block-context" style="margin: 10px 0 0 0">States within a state machine have certain duties that they must fulfill if they want to work well in the state machine we have devised</p>
<ul class="diff-block-target" style="margin: 10px 0 0 0">
<li>A state must know what <span class="diff-html-removed" id="removed-diff-8" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">state machine-defined </span>events should cause it to change states, though it does not need to know what state it will be transitioning to.</li>
<li>A state must set up ARI event listeners each time the state is entered, and it must remove these before changing states.<span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span><span class="diff-html-removed" id="removed-diff-9" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">In the states we will be defining, we will write a </span><code style="font-family: monospace"><span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">cleanup()</span></code><span class="diff-html-removed" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> method.</span> </li>
<li>The state must define the following attributes:
<ul style="margin: 10px 0 0 0; margin-top: 0">
<li> <code style="font-family: monospace">state_name</code>, a string that represents the name of the state.</li>
<li> <code style="font-family: monospace">enter()</code>, a method that is called whenever the state is entered.</li>
</ul> </li>
</ul> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> </td>
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