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#!/usr/bin/env python
#
# Copyright (c) 2016 Cisco and/or its affiliates.
# Licensed 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.
import os
import callback_gen
import util
from string import Template
from util import remove_suffix
notification_registry_template = Template("""
package $base_package.$notification_package;
/**
* <p>Registry for notification callbacks.
* <br>It was generated by notification_gen.py based on $inputfile
* <br>(python representation of vpe.api generated by vppapigen).
*/
public interface NotificationRegistry extends java.lang.AutoCloseable {
$register_callback_methods
@Override
void close();
}
""")
global_notification_callback_template = Template("""
package $base_package.$notification_package;
/**
* <p>Aggregated callback interface for notifications only.
* <br>It was generated by notification_gen.py based on $inputfile
* <br>(python representation of vpe.api generated by vppapigen).
*/
public interface GlobalNotificationCallback extends $callbacks {
}
""")
notification_registry_impl_template = Template("""
package $base_package.$notification_package;
/**
* <p>Notification registry delegating notification processing to registered callbacks.
* <br>It was generated by notification_gen.py based on $inputfile
* <br>(python representation of vpe.api generated by vppapigen).
*/
public final class NotificationRegistryImpl implements NotificationRegistry, GlobalNotificationCallback {
// TODO add a special NotificationCallback interface and only allow those to be registered
private final java.util.concurrent.ConcurrentMap<Class<? extends $base_package.$dto_package.JVppNotification>, $base_package.$callback_package.JVppNotificationCallback> registeredCallbacks =
new java.util.concurrent.ConcurrentHashMap<>();
$register_callback_methods
$handler_methods
@Override
public void close() {
registeredCallbacks.clear();
}
}
""")
register_callback_impl_template = Template("""
public java.lang.AutoCloseable register$callback(final $base_package.$callback_package.$callback callback){
if(null != registeredCallbacks.putIfAbsent($base_package.$dto_package.$notification.class, callback)){
throw new IllegalArgumentException("Callback for " + $base_package.$dto_package.$notification.class +
"notification already registered");
}
return () -> registeredCallbacks.remove($base_package.$dto_package.$notification.class);
}
""")
handler_impl_template = Template("""
@Override
public void on$notification(
final $base_package.$dto_package.$notification notification) {
final $base_package.$callback_package.JVppNotificationCallback JVppNotificationCallback = registeredCallbacks.get($base_package.$dto_package.$notification.class);
if (null != JVppNotificationCallback) {
(($base_package.$callback_package.$callback) registeredCallbacks
.get($base_package.$dto_package.$notification.class))
.on$notification(notification);
}
}
""")
def generate_notification_registry(func_list, base_package, notification_package, callback_package, dto_package, inputfile):
""" Generates notification registry interface and implementation """
print "Generating Notification interfaces and implementation"
if not os.path.exists(notification_package):
raise Exception("%s folder is missing" % notification_package)
callbacks = []
register_callback_methods = []
register_callback_methods_impl = []
handler_methods = []
for func in func_list:
if not util.is_notification(func['name']):
continue
camel_case_name_with_suffix = util.underscore_to_camelcase_upper(func['name'])
notification_dto = util.add_notification_suffix(camel_case_name_with_suffix)
callback_ifc = notification_dto + callback_gen.callback_suffix
fully_qualified_callback_ifc = "{0}.{1}.{2}".format(base_package, callback_package, callback_ifc)
callbacks.append(fully_qualified_callback_ifc)
# TODO create NotificationListenerRegistration and return that instead of AutoCloseable to better indicate
# that the registration should be closed
register_callback_methods.append("java.lang.AutoCloseable register{0}({1} callback);"
.format(callback_ifc, fully_qualified_callback_ifc))
register_callback_methods_impl.append(register_callback_impl_template.substitute(base_package=base_package,
callback_package=callback_package,
dto_package=dto_package,
notification=notification_dto,
callback=callback_ifc))
handler_methods.append(handler_impl_template.substitute(base_package=base_package,
callback_package=callback_package,
dto_package=dto_package,
notification=notification_dto,
callback=callback_ifc))
if(callbacks):
callback_file = open(os.path.join(notification_package, "NotificationRegistry.java"), 'w')
callback_file.write(notification_registry_template.substitute(inputfile=inputfile,
register_callback_methods="\n ".join(register_callback_methods),
base_package=base_package,
notification_package=notification_package))
callback_file.flush()
callback_file.close()
callback_file = open(os.path.join(notification_package, "GlobalNotificationCallback.java"), 'w')
callback_file.write(global_notification_callback_template.substitute(inputfile=inputfile,
callbacks=", ".join(callbacks),
base_package=base_package,
notification_package=notification_package))
callback_file.flush()
callback_file.close()
callback_file = open(os.path.join(notification_package, "NotificationRegistryImpl.java"), 'w')
callback_file.write(notification_registry_impl_template.substitute(inputfile=inputfile,
callback_package=callback_package,
dto_package=dto_package,
register_callback_methods="".join(register_callback_methods_impl),
handler_methods="".join(handler_methods),
base_package=base_package,
notification_package=notification_package))
callback_file.flush()
callback_file.close()
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