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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package org.apache.qpid.server.flow;
import org.apache.qpid.test.utils.QpidTestCase;
public class WindowCreditManagerTest extends QpidTestCase
{
WindowCreditManager _creditManager;
protected void setUp() throws Exception
{
super.setUp();
_creditManager = new WindowCreditManager();
}
/**
* Tests that after the credit limit is cleared (e.g. from a message.stop command), credit is
* restored (e.g. from completed MessageTransfer) without increasing the available credit, and
* more credit is added, that the 'used' count is correct and the proper values for bytes
* and message credit are returned along with appropriate 'hasCredit' results (QPID-3592).
*/
public void testRestoreCreditDecrementsUsedCountAfterCreditClear()
{
assertEquals("unexpected credit value", 0, _creditManager.getMessageCredit());
assertEquals("unexpected credit value", 0, _creditManager.getBytesCredit());
//give some message credit
_creditManager.addCredit(1, 0);
assertFalse("Manager should not 'haveCredit' due to having 0 bytes credit", _creditManager.hasCredit());
assertEquals("unexpected credit value", 1, _creditManager.getMessageCredit());
assertEquals("unexpected credit value", 0, _creditManager.getBytesCredit());
//give some bytes credit
_creditManager.addCredit(0, 1);
assertTrue("Manager should 'haveCredit'", _creditManager.hasCredit());
assertEquals("unexpected credit value", 1, _creditManager.getMessageCredit());
assertEquals("unexpected credit value", 1, _creditManager.getBytesCredit());
//use all the credit
_creditManager.useCreditForMessage(1);
assertEquals("unexpected credit value", 0, _creditManager.getBytesCredit());
assertEquals("unexpected credit value", 0, _creditManager.getMessageCredit());
assertFalse("Manager should not 'haveCredit'", _creditManager.hasCredit());
//clear credit out (eg from a message.stop command)
_creditManager.clearCredit();
assertEquals("unexpected credit value", 0, _creditManager.getBytesCredit());
assertEquals("unexpected credit value", 0, _creditManager.getMessageCredit());
assertFalse("Manager should not 'haveCredit'", _creditManager.hasCredit());
//restore credit (e.g the original message transfer command got completed)
//this should not increase credit, because it is now limited to 0
_creditManager.restoreCredit(1, 1);
assertEquals("unexpected credit value", 0, _creditManager.getBytesCredit());
assertEquals("unexpected credit value", 0, _creditManager.getMessageCredit());
assertFalse("Manager should not 'haveCredit'", _creditManager.hasCredit());
//give more credit to open the window again
_creditManager.addCredit(1, 1);
assertEquals("unexpected credit value", 1, _creditManager.getBytesCredit());
assertEquals("unexpected credit value", 1, _creditManager.getMessageCredit());
assertTrue("Manager should 'haveCredit'", _creditManager.hasCredit());
}
}
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