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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.
*
*/
#include "amqp_0_10/unit_test.h"
#include "qpid/Exception.h"
#include "qpid/amqp_0_10/Unit.h"
#include "qpid/amqp_0_10/ControlHolder.h"
#include "qpid/amqp_0_10/CommandHolder.h"
#include "qpid/amqp_0_10/handlers.h"
#include "qpid/amqp_0_10/specification.h"
QPID_AUTO_TEST_SUITE(handler_tests)
using namespace qpid::amqp_0_10;
using namespace std;
string called; // Set by called handler function
// Note on handlers:
//
// Control and Command handlers are separate, both behave the same way,
// so substitute "control or command" for command in the following.
//
// Command handlers derive from CommandHandler and implement functions
// for all the commands they handle. Handling an unimplemented command
// will raise NotImplementedException.
//
// Using virtual inheritance from CommandHandler allows multiple
// handlers to be aggregated into one with multiple inheritance,
// See test code for example.
//
// E.g. the existing broker model would have two control handlers:
// - ConnectionHandler: ControlHandler for connection controls.
// - SessionHandler: ControlHandler for session controls.
// It would have class-command handlers for each AMQP class:
// - QueueHandler, MessageHandler etc.. handle each class.
// And an aggregate handler in place of BrokerAdapter
// - BrokerCommandHandler: public QueueHandler, MessageHandler ...
//
// In other applications (e.g. cluster) any combination of commands
// can be handled by a given handler. It _might_ simplify the code
// to collaps ConnectionHandler and SessionHandler into a single
// ControlHandler (or it might not.)
struct TestExecutionHandler : public virtual CommandHandler {
void executionSync() { called = "executionSync"; }
// ... etc. for all execution commands
};
struct TestMessageHandler : public virtual CommandHandler {
void messageCancel(const Str8&) { called="messageCancel"; }
// ... etc.
};
// Aggregate handler for all recognised commands.
struct TestCommandHandler :
public TestExecutionHandler,
public TestMessageHandler
// ... etc. handlers for all command classes.
{}; // Nothing to do.
// Sample unit handler, written as a static_visitor.
// Note it could equally be written with if/else statements
// in handle.
//
struct TestUnitHandler : public boost::static_visitor<void> {
TestCommandHandler handler;
void handle(const Unit& u) { u.applyVisitor(*this); }
void operator()(const Body&) { called="Body"; }
void operator()(const Header&) { called="Header"; }
void operator()(const ControlHolder&) { throw qpid::Exception("I don't do controls."); }
void operator()(const CommandHolder& c) { c.invoke(handler); }
};
QPID_AUTO_TEST_CASE(testHandlers) {
TestUnitHandler handler;
Unit u;
u = Body();
handler.handle(u);
BOOST_CHECK_EQUAL("Body", called);
u = Header();
handler.handle(u);
BOOST_CHECK_EQUAL("Header", called);
// in_place<Foo>(...) is equivalent to Foo(...) but
// constructs Foo directly in the holder, avoiding
// a copy.
u = CommandHolder(in_place<execution::Sync>());
handler.handle(u);
BOOST_CHECK_EQUAL("executionSync", called);
u = ControlHolder(in_place<connection::Start>(Map(), Str16Array(), Str16Array()));
try {
handler.handle(u);
} catch (const qpid::Exception&) {}
u = CommandHolder(in_place<message::Cancel>(Str8()));
handler.handle(u);
BOOST_CHECK_EQUAL("messageCancel", called);
}
QPID_AUTO_TEST_SUITE_END()
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