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connection_pool_spec.rb
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connection_pool_spec.rb
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require File.join(File.dirname(__FILE__), 'spec_helper')
CONNECTION_POOL_DEFAULTS = {:pool_timeout=>5, :pool_sleep_time=>0.001,
:pool_reuse_connections=>:allow, :pool_convert_exceptions=>true, :max_connections=>4}
context "An empty ConnectionPool" do
setup do
@cpool = Sequel::ConnectionPool.new(CONNECTION_POOL_DEFAULTS)
end
specify "should have no available connections" do
@cpool.available_connections.should == []
end
specify "should have no allocated connections" do
@cpool.allocated.should == {}
end
specify "should have a created_count of zero" do
@cpool.created_count.should == 0
end
end
context "A connection pool handling connections" do
setup do
@max_size = 2
@cpool = Sequel::ConnectionPool.new(CONNECTION_POOL_DEFAULTS.merge(:max_connections=>@max_size)) {:got_connection}
end
specify "#hold should increment #created_count" do
@cpool.hold do
@cpool.created_count.should == 1
@cpool.hold {@cpool.hold {@cpool.created_count.should == 1}}
Thread.new{@cpool.hold {@cpool.created_count.should == 2}}.join
end
end
specify "#hold should add the connection to the #allocated array" do
@cpool.hold do
@cpool.allocated.size.should == 1
@cpool.allocated.should == {Thread.current=>:got_connection}
end
end
specify "#hold should yield a new connection" do
@cpool.hold {|conn| conn.should == :got_connection}
end
specify "a connection should be de-allocated after it has been used in #hold" do
@cpool.hold {}
@cpool.allocated.size.should == 0
end
specify "#hold should return the value of its block" do
@cpool.hold {:block_return}.should == :block_return
end
specify "#make_new should not make more than max_size connections" do
@cpool.send(:make_new, :default).should == :got_connection
@cpool.send(:make_new, :default).should == :got_connection
@cpool.send(:make_new, :default).should == nil
@cpool.created_count.should == 2
end
end
class DummyConnection
@@value = 0
def initialize
@@value += 1
end
def value
@@value
end
end
context "ConnectionPool#hold" do
setup do
@pool = Sequel::ConnectionPool.new(CONNECTION_POOL_DEFAULTS) {DummyConnection.new}
end
specify "should pass the result of the connection maker proc to the supplied block" do
res = nil
@pool.hold {|c| res = c}
res.should be_a_kind_of(DummyConnection)
res.value.should == 1
@pool.hold {|c| res = c}
res.should be_a_kind_of(DummyConnection)
res.value.should == 1 # the connection maker is invoked only once
end
specify "should be re-entrant by the same thread" do
cc = nil
@pool.hold {|c| @pool.hold {|c| @pool.hold {|c| cc = c}}}
cc.should be_a_kind_of(DummyConnection)
end
specify "should catch exceptions and reraise them" do
proc {@pool.hold {|c| c.foobar}}.should raise_error(NoMethodError)
end
specify "should handle Exception errors (normally not caught by rescue)" do
err = nil
begin
@pool.hold {raise Exception}
rescue => e
err = e
end
err.should be_a_kind_of(RuntimeError)
end
end
context "ConnectionPool#connection_proc" do
setup do
@pool = Sequel::ConnectionPool.new(CONNECTION_POOL_DEFAULTS)
end
specify "should be nil if no block is supplied to the pool" do
@pool.connection_proc.should be_nil
proc {@pool.hold {}}.should raise_error
end
specify "should be mutable" do
@pool.connection_proc = proc {'herro'}
res = nil
proc {@pool.hold {|c| res = c}}.should_not raise_error
res.should == 'herro'
end
end
context "A connection pool with a max size of 1" do
setup do
@invoked_count = 0
@pool = Sequel::ConnectionPool.new(CONNECTION_POOL_DEFAULTS.merge(:max_connections=>1)) {@invoked_count += 1; 'herro'}
end
specify "should let only one thread access the connection at any time" do
cc,c1, c2 = nil
t1 = Thread.new {@pool.hold {|c| cc = c; c1 = c.dup; while c == 'herro';sleep 0.1;end}}
sleep 0.2
cc.should == 'herro'
c1.should == 'herro'
t2 = Thread.new {@pool.hold {|c| c2 = c.dup; while c == 'hello';sleep 0.1;end}}
sleep 0.2
# connection held by t1
t1.should be_alive
t2.should be_alive
cc.should == 'herro'
c1.should == 'herro'
c2.should be_nil
@pool.available_connections.should be_empty
@pool.allocated.should == {t1=>cc}
cc.gsub!('rr', 'll')
sleep 0.5
# connection held by t2
t1.should_not be_alive
t2.should be_alive
c2.should == 'hello'
@pool.available_connections.should be_empty
@pool.allocated.should == {t2=>cc}
cc.gsub!('ll', 'rr')
sleep 0.5
#connection released
t2.should_not be_alive
cc.should == 'herro'
@invoked_count.should == 1
@pool.size.should == 1
@pool.available_connections.should == [cc]
@pool.allocated.should be_empty
end
specify "should let the same thread reenter #hold" do
c1, c2, c3 = nil
@pool.hold do |c|
c1 = c
@pool.hold do |c|
c2 = c
@pool.hold do |c|
c3 = c
end
end
end
c1.should == 'herro'
c2.should == 'herro'
c3.should == 'herro'
@invoked_count.should == 1
@pool.size.should == 1
@pool.available_connections.size.should == 1
@pool.allocated.should be_empty
end
end
context "A connection pool with a max size of 5" do
setup do
@invoked_count = 0
@pool = Sequel::ConnectionPool.new(CONNECTION_POOL_DEFAULTS.merge(:max_connections=>5)) {@invoked_count += 1}
end
specify "should let five threads simultaneously access separate connections" do
cc = {}
threads = []
stop = nil
5.times {|i| threads << Thread.new {@pool.hold {|c| cc[i] = c; while !stop;sleep 0.1;end}}; sleep 0.1}
sleep 0.2
threads.each {|t| t.should be_alive}
cc.size.should == 5
@invoked_count.should == 5
@pool.size.should == 5
@pool.available_connections.should be_empty
i = 0
h = {}
threads.each{|t| h[t] = (i+=1)}
@pool.allocated.should == h
threads[0].raise "your'e dead"
sleep 0.1
threads[3].raise "your'e dead too"
sleep 0.1
@pool.available_connections.should == [1, 4]
@pool.allocated.should == {threads[1]=>2, threads[2]=>3, threads[4]=>5}
stop = true
sleep 0.2
@pool.available_connections.size.should == 5
@pool.allocated.should be_empty
end
specify "should block threads until a connection becomes available" do
cc = {}
threads = []
stop = nil
5.times {|i| threads << Thread.new {@pool.hold {|c| cc[i] = c; while !stop;sleep 0.1;end}}; sleep 0.1}
sleep 0.2
threads.each {|t| t.should be_alive}
@pool.available_connections.should be_empty
3.times {|i| threads << Thread.new {@pool.hold {|c| cc[i + 5] = c}}}
sleep 0.2
threads[5].should be_alive
threads[6].should be_alive
threads[7].should be_alive
cc.size.should == 5
cc[5].should be_nil
cc[6].should be_nil
cc[7].should be_nil
stop = true
sleep 0.3
threads.each {|t| t.should_not be_alive}
@pool.size.should == 5
@invoked_count.should == 5
@pool.available_connections.size.should == 5
@pool.allocated.should be_empty
end
end
context "ConnectionPool#disconnect" do
setup do
@count = 0
@pool = Sequel::ConnectionPool.new(CONNECTION_POOL_DEFAULTS.merge(:max_connections=>5)) {{:id => @count += 1}}
end
specify "should invoke the given block for each available connection" do
threads = []
stop = nil
5.times {|i| threads << Thread.new {@pool.hold {|c| while !stop;sleep 0.1;end}}; sleep 0.1}
while @pool.size < 5
sleep 0.2
end
stop = true
sleep 1
threads.each {|t| t.join}
@pool.size.should == 5
@pool.available_connections.size.should == 5
@pool.available_connections.each {|c| c[:id].should_not be_nil}
conns = []
@pool.disconnect {|c| conns << c}
conns.size.should == 5
end
specify "should remove all available connections" do
threads = []
stop = nil
5.times {|i| threads << Thread.new {@pool.hold {|c| while !stop;sleep 0.1;end}}; sleep 0.1}
while @pool.size < 5
sleep 0.2
end
stop = true
sleep 1
threads.each {|t| t.join}
@pool.size.should == 5
@pool.disconnect
@pool.size.should == 0
end
specify "should not touch connections in use" do
threads = []
stop = nil
5.times {|i| threads << Thread.new {@pool.hold {|c| while !stop;sleep 0.1;end}}; sleep 0.1}
while @pool.size < 5
sleep 0.2
end
stop = true
sleep 1
threads.each {|t| t.join}
@pool.size.should == 5
@pool.hold do |conn|
@pool.available_connections.size.should == 4
@pool.available_connections.each {|c| c.should_not be(conn)}
conns = []
@pool.disconnect {|c| conns << c}
conns.size.should == 4
end
@pool.size.should == 1
end
end
context "A connection pool with multiple servers" do
setup do
@invoked_counts = Hash.new(0)
@pool = Sequel::ConnectionPool.new(CONNECTION_POOL_DEFAULTS.merge(:servers=>{:read_only=>{}})){|server| "#{server}#{@invoked_counts[server] += 1}"}
end
specify "should use the :default server by default" do
@pool.size.should == 0
@pool.hold do |c|
c.should == "default1"
@pool.allocated.should == {Thread.current=>"default1"}
end
@pool.available_connections.should == ["default1"]
@pool.size.should == 1
@invoked_counts.should == {:default=>1}
end
specify "should use the requested server if server is given" do
@pool.size(:read_only).should == 0
@pool.hold(:read_only) do |c|
c.should == "read_only1"
@pool.allocated(:read_only).should == {Thread.current=>"read_only1"}
end
@pool.available_connections(:read_only).should == ["read_only1"]
@pool.size(:read_only).should == 1
@invoked_counts.should == {:read_only=>1}
end
specify "#hold should only yield connections for the server requested" do
@pool.hold(:read_only) do |c|
c.should == "read_only1"
@pool.allocated(:read_only).should == {Thread.current=>"read_only1"}
@pool.hold do |d|
d.should == "default1"
@pool.hold do |e|
e.should == d
@pool.hold(:read_only){|b| b.should == c}
end
@pool.allocated.should == {Thread.current=>"default1"}
end
end
@invoked_counts.should == {:read_only=>1, :default=>1}
end
specify "#disconnect should disconnect from all servers" do
@pool.hold(:read_only){}
@pool.hold{}
conns = []
@pool.size.should == 1
@pool.size(:read_only).should == 1
@pool.disconnect{|c| conns << c}
conns.sort.should == %w'default1 read_only1'
@pool.size.should == 0
@pool.size(:read_only).should == 0
@pool.hold(:read_only){|c| c.should == 'read_only2'}
@pool.hold{|c| c.should == 'default2'}
end
end
context "SingleThreadedPool" do
setup do
@pool = Sequel::SingleThreadedPool.new(CONNECTION_POOL_DEFAULTS){1234}
end
specify "should provide a #hold method" do
conn = nil
@pool.hold {|c| conn = c}
conn.should == 1234
end
specify "should provide a #disconnect method" do
@pool.hold {|c|}
@pool.conn.should == 1234
conn = nil
@pool.disconnect {|c| conn = c}
conn.should == 1234
@pool.conn.should be_nil
end
end
context "A single threaded pool with multiple servers" do
setup do
@pool = Sequel::SingleThreadedPool.new(CONNECTION_POOL_DEFAULTS.merge(:servers=>{:read_only=>{}})){|server| server}
end
specify "should use the :default server by default" do
@pool.hold{|c| c.should == :default}
@pool.conn.should == :default
end
specify "should use the requested server if server is given" do
@pool.hold(:read_only){|c| c.should == :read_only}
@pool.conn(:read_only).should == :read_only
end
specify "#hold should only yield connections for the server requested" do
@pool.hold(:read_only) do |c|
c.should == :read_only
@pool.hold do |d|
d.should == :default
@pool.hold do |e|
e.should == d
@pool.hold(:read_only){|b| b.should == c}
end
end
end
@pool.conn.should == :default
@pool.conn(:read_only).should == :read_only
end
specify "#disconnect should disconnect from all servers" do
@pool.hold(:read_only){}
@pool.hold{}
conns = []
@pool.conn.should == :default
@pool.conn(:read_only).should == :read_only
@pool.disconnect{|c| conns << c}
conns.sort_by{|x| x.to_s}.should == [:default, :read_only]
@pool.conn.should == nil
@pool.conn(:read_only).should == nil
end
end