return strcmp( $hashes[$a], $hashes[$b] );
} );
// Fit the map to weight-proportionate one with a space of size RING_SIZE
+ $sum = array_sum( $map );
$standardMap = array();
foreach ( $map as $location => $weight ) {
$standardMap[$location] = (int)floor( $weight / $sum * self::RING_SIZE );
--- /dev/null
+<?php
+
+/**
+ * @group HashRing
+ */
+class HashRingTest extends MediaWikiTestCase {
+ function testHashRing() {
+ $ring = new HashRing( array( 's1' => 1, 's2' => 1, 's3' => 2, 's4' => 2, 's5' => 2, 's6' => 3 ) );
+
+ $locations = array();
+ for ( $i=0; $i<20; $i++ ) {
+ $locations[ "hello$i"] = $ring->getLocation( "hello$i" );
+ }
+ $expectedLocations = array(
+ "hello0" => "s5",
+ "hello1" => "s6",
+ "hello2" => "s2",
+ "hello3" => "s5",
+ "hello4" => "s6",
+ "hello5" => "s4",
+ "hello6" => "s5",
+ "hello7" => "s4",
+ "hello8" => "s5",
+ "hello9" => "s5",
+ "hello10" => "s3",
+ "hello11" => "s6",
+ "hello12" => "s1",
+ "hello13" => "s3",
+ "hello14" => "s3",
+ "hello15" => "s5",
+ "hello16" => "s4",
+ "hello17" => "s6",
+ "hello18" => "s6",
+ "hello19" => "s3"
+ );
+
+ $this->assertEquals( $expectedLocations, $locations, 'Items placed at proper locations' );
+
+ $locations = array();
+ for ( $i=0; $i<5; $i++ ) {
+ $locations[ "hello$i"] = $ring->getLocations( "hello$i", 2 );
+ }
+
+ $expectedLocations = array(
+ "hello0" => array( "s5", "s6" ),
+ "hello1" => array( "s6", "s4" ),
+ "hello2" => array( "s2", "s1" ),
+ "hello3" => array( "s5", "s6" ),
+ "hello4" => array( "s6", "s4" ),
+ );
+ $this->assertEquals( $expectedLocations, $locations, 'Items placed at proper locations' );
+ }
+}