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#*****************************************************************************
# Copyright 2013 Thomas Calmant
#
# 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 sys
# ------------------------------------------------------------------------------
class JVMNotFoundException(RuntimeError):
pass
class JVMNotSupportedException(RuntimeError):
pass
class JVMFinder(object):
"""
JVM library finder base class
"""
def __init__(self):
"""
Sets up members
"""
# Library file name
self._libfile = "libjvm.so"
# Predefined locations
self._locations = ("/usr/lib/jvm", "/usr/java")
# Search methods
self._methods = (self._get_from_java_home,
self._get_from_known_locations)
def find_libjvm(self, java_home):
"""
Recursively looks for the given file
:param java_home: A Java home folder
:param filename: Name of the file to find
:return: The first found file path, or None
"""
found_jamvm = False
non_supported_jvm = ('cacao', 'jamvm')
found_non_supported_jvm = False
# Look for the file
for root, _, names in os.walk(java_home):
if self._libfile in names:
# Found it, but check for non supported jvms
candidate = os.path.split(root)[1]
if candidate in non_supported_jvm:
found_non_supported_jvm = True
continue # maybe we will find another one?
return os.path.join(root, self._libfile)
else:
if found_non_supported_jvm:
raise JVMNotSupportedException("Sorry '{0}' is known to be "
"broken. Please ensure your "
"JAVA_HOME contains at least "
"another JVM implementation "
"(eg. server)"
.format(candidate))
# File not found
raise JVMNotFoundException("Sorry no JVM could be found. "
"Please ensure your JAVA_HOME "
"environment variable is pointing "
"to correct installation.")
def find_possible_homes(self, parents):
"""
Generator that looks for the first-level children folders that could be
Java installations, according to their name
:param parents: A list of parent directories
:return: The possible JVM installation folders
"""
homes = []
java_names = ('jre', 'jdk', 'java')
for parent in parents:
for childname in sorted(os.listdir(parent)):
# Compute the real path
path = os.path.realpath(os.path.join(parent, childname))
if path in homes or not os.path.isdir(path):
# Already known path, or not a directory -> ignore
continue
# Check if the path seems OK
real_name = os.path.basename(path).lower()
for java_name in java_names:
if java_name in real_name:
# Correct JVM folder name
homes.append(path)
yield path
break
def check(self, jvm):
"""
Check if the jvm is valid for this architecture.
This method should be overriden for each architecture.
:raise JVMNotSupportedException: If the jvm is not supported.
"""
pass
def get_jvm_path(self):
"""
Retrieves the path to the default or first found JVM library
:return: The path to the JVM shared library file
:raise ValueError: No JVM library found
"""
for method in self._methods:
try:
jvm = method()
# If found check the architecture
if jvm:
self.check(jvm)
except NotImplementedError:
# Ignore missing implementations
pass
except JVMNotFoundException:
# Ignore not successful methods
pass
except JVMNotSupportedException:
pass
else:
if jvm is not None:
return jvm
else:
raise JVMNotFoundException("No JVM shared library file ({0}) "
"found. Try setting up the JAVA_HOME "
"environment variable properly."
.format(self._libfile))
def _get_from_java_home(self):
"""
Retrieves the Java library path according to the JAVA_HOME environment
variable
:return: The path to the JVM library, or None
"""
# Get the environment variable
java_home = os.getenv("JAVA_HOME")
if java_home and os.path.exists(java_home):
# Get the real installation path
java_home = os.path.realpath(java_home)
# Cygwin has a bug in realpath
if not os.path.exists(java_home):
java_home = os.getenv("JAVA_HOME")
# Look for the library file
return self.find_libjvm(java_home)
def _get_from_known_locations(self):
"""
Retrieves the first existing Java library path in the predefined known
locations
:return: The path to the JVM library, or None
"""
for home in self.find_possible_homes(self._locations):
jvm = self.find_libjvm(home)
if jvm is not None:
return jvm
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