com.gemstone.gemfire.internal.SmHelper Maven / Gradle / Ivy
/*
* Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
*
* 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. See accompanying
* LICENSE file.
*/
package com.gemstone.gemfire.internal;
import com.gemstone.gemfire.internal.i18n.LocalizedStrings;
import java.util.*;
import java.lang.reflect.*;
import java.io.InvalidClassException;
/**
* This class defines general native utils.
*
* @author Darrel Schneider
*
*/
public class SmHelper {
static final boolean pureMode = PureJavaMode.isPure();
/* ================== Native Methods =========================== */
/**
* Returns the size in bytes of a C pointer in this
* shared library, returns 4 for a 32 bit shared library,
* and 8 for a 64 bit shared library
*/
public static int pointerSizeBytes() {
if (pureMode) {
throw new IllegalStateException(LocalizedStrings.SmHelper_POINTERSIZEBYTES_UNAVAILABLE_IN_PURE_MODE.toLocalizedString());
} else {
return _pointerSizeBytes();
}
}
private static native int _pointerSizeBytes();
/* ================== System Administration =========================== */
/**
* Sleeps for the specified number of nanoseconds.
*/
private static native void _nanosleep(int nanos);
/**
* Sleeps for the specified number of nanoseconds.
*/
public static void nanosleep(long nanos) throws InterruptedException {
if (Thread.interrupted()) throw new InterruptedException();
if (nanos <= 0) {
return;
}
if (nanos >= 1000000) {
Thread.sleep(nanos/1000000, (int)(nanos%1000000));
} else {
if (pureMode) {
// fix for bug 35150
Thread.yield();
} else {
_nanosleep((int)nanos);
}
}
}
/**
* Returns the GemFire native code library's version string.
*/
public static String getNativeVersion() {
if (pureMode) {
return LocalizedStrings.SmHelper_NATIVE_CODE_UNAVAILABLE.toLocalizedString();
} else {
return _getNativeVersion();
}
}
private static native String _getNativeVersion();
public static String getSystemId() {
if (pureMode) {
return "pureJavaMode";
} else {
return _getSystemId();
}
}
private static native String _getSystemId();
/** Cache of class -> has zero-arg constructor */
private static Map zeroArgConstructorCache = new HashMap();
/** Cache of class -> has public zero-arg constructor */
private static Map publicConstructorCache = new HashMap();
/**
* Allocates a new JOM instance of c and
* invokes the zero-argument constructor of initClass
* on the new object to initialize it. This takes the place of the
* late, lamented allocateNewObject method of
* java.io.ObjectInputStream in JDK 1.3.
*
* @throws InvalidClassException
* If c or initClass represents a
* primitive class.
* @throws NoSuchMethodError
* If initClass doesn't have a zero-argument
* constructor
* @throws IllegalAccessException
* If the zero-argument constructor is not public (only for
* Externalizable classes in which
* c.equals(initClass)
*/
public static Object allocateJOMObject(Class c, Class initClass)
throws IllegalAccessException, InvalidClassException {
if (c.isPrimitive()) {
throw new InvalidClassException(LocalizedStrings.SmHelper_IS_PRIMITIVE.toLocalizedString(), c.getName());
} else if (initClass.isPrimitive()) {
throw new InvalidClassException(LocalizedStrings.SmHelper_IS_PRIMITIVE.toLocalizedString(), initClass.getName());
}
// boolean hasZeroArgInit;
if (!zeroArgConstructorCache.containsKey(initClass)) {
try {
// Constructor init =
initClass.getDeclaredConstructor(new Class[0]);
if (Modifier.isPublic(initClass.getModifiers())) {
publicConstructorCache.put(initClass, Boolean.TRUE);
} else {
publicConstructorCache.put(initClass, Boolean.FALSE);
}
} catch (NoSuchMethodException ex) {
zeroArgConstructorCache.put(initClass, Boolean.FALSE);
throw new NoSuchMethodError();
}
} else {
Boolean b = (Boolean) zeroArgConstructorCache.get(initClass);
if (!b.booleanValue()) {
throw new NoSuchMethodError();
}
}
// // Doesn't let us invoke the non-public constructors of inner
// // classes
// boolean isPublic =
// ((Boolean) publicConstructorCache.get(initClass)).booleanValue();
// if (c.equals(initClass) && !isPublic) {
// throw new IllegalAccessException();
// }
return _allocateJOMObject(c, initClass);
}
/**
* Natively allocates a new JOM instance of c and
* invokes the zero-argument constructor of initClass
* on the new object to initialize it. This takes the place of the
* late, lamented allocateNewObject method of
* java.io.ObjectInputStream in JDK 1.3.
*/
private static native Object _allocateJOMObject(Class c, Class initClass);
/**
* Uses native code to set the value of an object JOM field
*/
public static native void _setObjectField(Object o, Field field, Object newValue);
}