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Add two new files missed by last commit of HDFS-3579.

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git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1370017 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Aaron Myers 2012-08-06 21:04:33 +00:00
parent f7b37c009b
commit b4545bf5aa
2 changed files with 335 additions and 0 deletions
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195
hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/exception.c Normal file
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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 "exception.h"
#include "hdfs.h"
#include "jni_helper.h"
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define EXCEPTION_INFO_LEN (sizeof(gExceptionInfo)/sizeof(gExceptionInfo[0]))
struct ExceptionInfo {
const char * const name;
int noPrintFlag;
int excErrno;
};
static const struct ExceptionInfo gExceptionInfo[] = {
{
.name = "java/io/FileNotFoundException",
.noPrintFlag = NOPRINT_EXC_FILE_NOT_FOUND,
.excErrno = ENOENT,
},
{
.name = "org/apache/hadoop/security/AccessControlException",
.noPrintFlag = NOPRINT_EXC_ACCESS_CONTROL,
.excErrno = EACCES,
},
{
.name = "org/apache/hadoop/fs/UnresolvedLinkException",
.noPrintFlag = NOPRINT_EXC_UNRESOLVED_LINK,
.excErrno = ENOLINK,
},
{
.name = "org/apache/hadoop/fs/ParentNotDirectoryException",
.noPrintFlag = NOPRINT_EXC_PARENT_NOT_DIRECTORY,
.excErrno = ENOTDIR,
},
{
.name = "java/lang/IllegalArgumentException",
.noPrintFlag = NOPRINT_EXC_ILLEGAL_ARGUMENT,
.excErrno = EINVAL,
},
{
.name = "java/lang/OutOfMemoryError",
.noPrintFlag = 0,
.excErrno = ENOMEM,
},
};
int printExceptionAndFreeV(JNIEnv *env, jthrowable exc, int noPrintFlags,
const char *fmt, va_list ap)
{
int i, noPrint, excErrno;
char *className = NULL;
jstring jStr = NULL;
jvalue jVal;
jthrowable jthr;
jthr = classNameOfObject(exc, env, &className);
if (jthr) {
fprintf(stderr, "PrintExceptionAndFree: error determining class name "
"of exception.\n");
className = strdup("(unknown)");
destroyLocalReference(env, jthr);
}
for (i = 0; i < EXCEPTION_INFO_LEN; i++) {
if (!strcmp(gExceptionInfo[i].name, className)) {
break;
}
}
if (i < EXCEPTION_INFO_LEN) {
noPrint = (gExceptionInfo[i].noPrintFlag & noPrintFlags);
excErrno = gExceptionInfo[i].excErrno;
} else {
noPrint = 0;
excErrno = EINTERNAL;
}
if (!noPrint) {
vfprintf(stderr, fmt, ap);
fprintf(stderr, " error:\n");
// We don't want to use ExceptionDescribe here, because that requires a
// pending exception. Instead, use ExceptionUtils.
jthr = invokeMethod(env, &jVal, STATIC, NULL,
"org/apache/commons/lang/exception/ExceptionUtils",
"getStackTrace", "(Ljava/lang/Throwable;)Ljava/lang/String;", exc);
if (jthr) {
fprintf(stderr, "(unable to get stack trace for %s exception: "
"ExceptionUtils::getStackTrace error.)\n", className);
destroyLocalReference(env, jthr);
} else {
jStr = jVal.l;
const char *stackTrace = (*env)->GetStringUTFChars(env, jStr, NULL);
if (!stackTrace) {
fprintf(stderr, "(unable to get stack trace for %s exception: "
"GetStringUTFChars error.)\n", className);
} else {
fprintf(stderr, "%s", stackTrace);
(*env)->ReleaseStringUTFChars(env, jStr, stackTrace);
}
}
}
destroyLocalReference(env, jStr);
destroyLocalReference(env, exc);
free(className);
return excErrno;
}
int printExceptionAndFree(JNIEnv *env, jthrowable exc, int noPrintFlags,
const char *fmt, ...)
{
va_list ap;
int ret;
va_start(ap, fmt);
ret = printExceptionAndFreeV(env, exc, noPrintFlags, fmt, ap);
va_end(ap);
return ret;
}
int printPendingExceptionAndFree(JNIEnv *env, int noPrintFlags,
const char *fmt, ...)
{
va_list ap;
int ret;
jthrowable exc;
exc = (*env)->ExceptionOccurred(env);
if (!exc) {
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, " error: (no exception)");
ret = 0;
} else {
(*env)->ExceptionClear(env);
va_start(ap, fmt);
ret = printExceptionAndFreeV(env, exc, noPrintFlags, fmt, ap);
va_end(ap);
}
return ret;
}
jthrowable getPendingExceptionAndClear(JNIEnv *env)
{
jthrowable jthr = (*env)->ExceptionOccurred(env);
if (!jthr)
return NULL;
(*env)->ExceptionClear(env);
return jthr;
}
jthrowable newRuntimeError(JNIEnv *env, const char *fmt, ...)
{
char buf[512];
jobject out, exc;
jstring jstr;
va_list ap;
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
jstr = (*env)->NewStringUTF(env, buf);
if (!jstr) {
// We got an out of memory exception rather than a RuntimeException.
// Too bad...
return getPendingExceptionAndClear(env);
}
exc = constructNewObjectOfClass(env, &out, "RuntimeException",
"(java/lang/String;)V", jstr);
(*env)->DeleteLocalRef(env, jstr);
// Again, we'll either get an out of memory exception or the
// RuntimeException we wanted.
return (exc) ? exc : out;
}

140
hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/exception.h Normal file
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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.
*/
#ifndef LIBHDFS_EXCEPTION_H
#define LIBHDFS_EXCEPTION_H
/**
* Exception handling routines for libhdfs.
*
* The convention we follow here is to clear pending exceptions as soon as they
* are raised. Never assume that the caller of your function will clean up
* after you-- do it yourself. Unhandled exceptions can lead to memory leaks
* and other undefined behavior.
*
* If you encounter an exception, return a local reference to it. The caller is
* responsible for freeing the local reference, by calling a function like
* PrintExceptionAndFree. (You can also free exceptions directly by calling
* DeleteLocalRef. However, that would not produce an error message, so it's
* usually not what you want.)
*/
#include <jni.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <search.h>
#include <pthread.h>
#include <errno.h>
/**
* Exception noprint flags
*
* Theses flags determine which exceptions should NOT be printed to stderr by
* the exception printing routines. For example, if you expect to see
* FileNotFound, you might use NOPRINT_EXC_FILE_NOT_FOUND, to avoid filling the
* logs with messages about routine events.
*
* On the other hand, if you don't expect any failures, you might pass
* PRINT_EXC_ALL.
*
* You can OR these flags together to avoid printing multiple classes of
* exceptions.
*/
#define PRINT_EXC_ALL 0x00
#define NOPRINT_EXC_FILE_NOT_FOUND 0x01
#define NOPRINT_EXC_ACCESS_CONTROL 0x02
#define NOPRINT_EXC_UNRESOLVED_LINK 0x04
#define NOPRINT_EXC_PARENT_NOT_DIRECTORY 0x08
#define NOPRINT_EXC_ILLEGAL_ARGUMENT 0x10
/**
* Print out information about an exception and free it.
*
* @param env The JNI environment
* @param exc The exception to print and free
* @param noPrintFlags Flags which determine which exceptions we should NOT
* print.
* @param fmt Printf-style format list
* @param ap Printf-style varargs
*
* @return The POSIX error number associated with the exception
* object.
*/
int printExceptionAndFreeV(JNIEnv *env, jthrowable exc, int noPrintFlags,
const char *fmt, va_list ap);
/**
* Print out information about an exception and free it.
*
* @param env The JNI environment
* @param exc The exception to print and free
* @param noPrintFlags Flags which determine which exceptions we should NOT
* print.
* @param fmt Printf-style format list
* @param ... Printf-style varargs
*
* @return The POSIX error number associated with the exception
* object.
*/
int printExceptionAndFree(JNIEnv *env, jthrowable exc, int noPrintFlags,
const char *fmt, ...) __attribute__((format(printf, 4, 5)));
/**
* Print out information about the pending exception and free it.
*
* @param env The JNI environment
* @param noPrintFlags Flags which determine which exceptions we should NOT
* print.
* @param fmt Printf-style format list
* @param ... Printf-style varargs
*
* @return The POSIX error number associated with the exception
* object.
*/
int printPendingExceptionAndFree(JNIEnv *env, int noPrintFlags,
const char *fmt, ...) __attribute__((format(printf, 3, 4)));
/**
* Get a local reference to the pending exception and clear it.
*
* Once it is cleared, the exception will no longer be pending. The caller will
* have to decide what to do with the exception object.
*
* @param env The JNI environment
*
* @return The exception, or NULL if there was no exception
*/
jthrowable getPendingExceptionAndClear(JNIEnv *env);
/**
* Create a new runtime error.
*
* This creates (but does not throw) a new RuntimeError.
*
* @param env The JNI environment
* @param fmt Printf-style format list
* @param ... Printf-style varargs
*
* @return A local reference to a RuntimeError
*/
jthrowable newRuntimeError(JNIEnv *env, const char *fmt, ...)
__attribute__((format(printf, 2, 3)));
#endif