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exception.c
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Wed, Feb 26, 23:35

exception.c
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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,
},
{
.name = "org.apache.hadoop.hdfs.server.namenode.SafeModeException",
.noPrintFlag = 0,
.excErrno = EROFS,
},
{
.name = "org.apache.hadoop.fs.FileAlreadyExistsException",
.noPrintFlag = 0,
.excErrno = EEXIST,
},
{
.name = "org.apache.hadoop.hdfs.protocol.QuotaExceededException",
.noPrintFlag = 0,
.excErrno = EDQUOT,
},
{
.name = "org.apache.hadoop.hdfs.server.namenode.LeaseExpiredException",
.noPrintFlag = 0,
.excErrno = ESTALE,
},
};
void getExceptionInfo(const char *excName, int noPrintFlags,
int *excErrno, int *shouldPrint)
{
int i;
for (i = 0; i < EXCEPTION_INFO_LEN; i++) {
if (strstr(gExceptionInfo[i].name, excName)) {
break;
}
}
if (i < EXCEPTION_INFO_LEN) {
*shouldPrint = !(gExceptionInfo[i].noPrintFlag & noPrintFlags);
*excErrno = gExceptionInfo[i].excErrno;
} else {
*shouldPrint = 1;
*excErrno = EINTERNAL;
}
}
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;
}

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