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// Test NamespaceDetails::emptyCappedCollection via 'emptycapped' command
Random.setRandomSeed();
db.capped7.drop();
db._dbCommand( { create: "capped7", capped: true, size: 1000, $nExtents: 11, autoIndexId: false } );
tzz = db.capped7;
var ten = new Array( 11 ).toString().replace( /,/g, "-" );
count = 0;
/**
* Insert new documents until the capped collection loops and the document
* count doesn't increase on insert.
*/
function insertUntilFull() {
count = tzz.count();
var j = 0;
while( 1 ) {
tzz.save( {i:ten,j:j++} );
var newCount = tzz.count();
if ( count == newCount ) {
break;
}
count = newCount;
}
}
insertUntilFull();
// oldCount == count before empty
oldCount = count;
assert.eq.automsg( "11", "tzz.stats().numExtents" );
// oldSize == size before empty
var oldSize = tzz.stats().storageSize;
assert.commandWorked( db._dbCommand( { emptycapped: "capped7" } ) );
// check that collection storage parameters are the same after empty
assert.eq.automsg( "11", "tzz.stats().numExtents" );
assert.eq.automsg( "oldSize", "tzz.stats().storageSize" );
// check that the collection is empty after empty
assert.eq.automsg( "0", "tzz.find().itcount()" );
assert.eq.automsg( "0", "tzz.count()" );
// check that we can reuse the empty collection, inserting as many documents
// as we were able to the first time through.
insertUntilFull();
assert.eq.automsg( "oldCount", "count" );
assert.eq.automsg( "oldCount", "tzz.find().itcount()" );
assert.eq.automsg( "oldCount", "tzz.count()" );
assert.eq.automsg( "11", "tzz.stats().numExtents" );
var oldSize = tzz.stats().storageSize;
assert.commandWorked( db._dbCommand( { emptycapped: "capped7" } ) );
// check that the collection storage parameters are unchanged after another empty
assert.eq.automsg( "11", "tzz.stats().numExtents" );
assert.eq.automsg( "oldSize", "tzz.stats().storageSize" );
// insert an arbitrary number of documents
var total = Random.randInt( 2000 );
for( var j = 1; j <= total; ++j ) {
tzz.save( {i:ten,j:j} );
// occasionally check that only the oldest documents are removed to make room
// for the newest documents
if ( Random.rand() > 0.95 ) {
assert.automsg( "j >= tzz.count()" );
assert.eq.automsg( "tzz.count()", "tzz.find().itcount()" );
var c = tzz.find().sort( {$natural:-1} );
var k = j;
assert.automsg( "c.hasNext()" );
while( c.hasNext() ) {
assert.eq.automsg( "c.next().j", "k--" );
}
// check the same thing with a reverse iterator as well
var c = tzz.find().sort( {$natural:1} );
assert.automsg( "c.hasNext()" );
while( c.hasNext() ) {
assert.eq.automsg( "c.next().j", "++k" );
}
assert.eq.automsg( "j", "k" );
}
}
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