56 lines
1.8 KiB
Python
56 lines
1.8 KiB
Python
# *****************************************************************************
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# See NOTICE file for details.
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#
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# *****************************************************************************
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import _jpype
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__all__ = ['onJVMStart']
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JInitializers = []
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def onJVMStart(func):
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"""Decorator to register a function to be called after JVM is started.
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This can be used to load module resources that depend on the JVM such as loading
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classes. If the JVM is not started, the user supplied function is held in a list until
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the JVM starts. When startJVM is called, all functions on the deferred list are called
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and the list is cleared. If the JVM is already started, then the function is called
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immediately.
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Errors from the function will either be raised immediately if the JVM is started, or
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from startJVM if the JVM is not yet started.
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Args:
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func (callable): a function to call when the JVM is started.
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"""
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registerJVMInitializer(func)
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return func
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def registerJVMInitializer(func):
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if not _jpype.isStarted():
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JInitializers.append(func)
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else:
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# JVM is already started so we are safe to execute immediately.
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func()
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def runJVMInitializers():
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for func in JInitializers:
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func()
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JInitializers.clear()
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