[120] | 1 | /** |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
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| 3 | * or more contributor license agreements. See the NOTICE file |
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| 4 | * distributed with this work for additional information |
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| 5 | * regarding copyright ownership. The ASF licenses this file |
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| 6 | * to you under the Apache License, Version 2.0 (the |
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| 7 | * "License"); you may not use this file except in compliance |
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| 8 | * with the License. You may obtain a copy of the License at |
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| 9 | * |
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| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 11 | * |
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| 12 | * Unless required by applicable law or agreed to in writing, software |
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| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 15 | * See the License for the specific language governing permissions and |
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| 16 | * limitations under the License. |
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| 17 | */ |
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| 18 | |
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| 19 | #include "exception.hh" |
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| 20 | #ifdef USE_EXECINFO |
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| 21 | #include <execinfo.h> |
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| 22 | #endif |
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| 23 | |
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| 24 | #include <errno.h> |
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| 25 | #include <sstream> |
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| 26 | #include <typeinfo> |
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| 27 | |
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| 28 | using std::string; |
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| 29 | |
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| 30 | namespace hadoop { |
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| 31 | |
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| 32 | /** |
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| 33 | * Create an exception. |
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| 34 | * @param message The message to give to the user. |
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| 35 | * @param reason The exception that caused the new exception. |
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| 36 | */ |
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| 37 | Exception::Exception(const string& message, |
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| 38 | const string& component, |
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| 39 | const string& location, |
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| 40 | const Exception* reason |
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| 41 | ): mMessage(message), |
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| 42 | mComponent(component), |
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| 43 | mLocation(location), |
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| 44 | mReason(reason) |
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| 45 | |
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| 46 | { |
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| 47 | #ifdef USE_EXECINFO |
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| 48 | mCalls = backtrace(mCallStack, sMaxCallStackDepth); |
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| 49 | #else |
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| 50 | mCalls = 0; |
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| 51 | #endif |
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| 52 | } |
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| 53 | |
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| 54 | /** |
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| 55 | * Copy the exception. |
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| 56 | * Clones the reason, if there is one. |
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| 57 | */ |
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| 58 | Exception::Exception(const Exception& other |
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| 59 | ): mMessage(other.mMessage), |
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| 60 | mComponent(other.mComponent), |
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| 61 | mLocation(other.mLocation), |
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| 62 | mCalls(other.mCalls) |
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| 63 | { |
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| 64 | for(int i=0; i < mCalls; ++i) { |
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| 65 | mCallStack[i] = other.mCallStack[i]; |
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| 66 | } |
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| 67 | if (other.mReason) { |
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| 68 | mReason = other.mReason->clone(); |
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| 69 | } else { |
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| 70 | mReason = NULL; |
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| 71 | } |
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| 72 | } |
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| 73 | |
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| 74 | Exception::~Exception() throw () { |
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| 75 | delete mReason; |
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| 76 | } |
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| 77 | |
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| 78 | /** |
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| 79 | * Print all of the information about the exception. |
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| 80 | */ |
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| 81 | void Exception::print(std::ostream& stream) const { |
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| 82 | stream << "Exception " << getTypename(); |
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| 83 | if (mComponent.size() != 0) { |
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| 84 | stream << " (" << mComponent << ")"; |
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| 85 | } |
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| 86 | stream << ": " << mMessage << "\n"; |
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| 87 | if (mLocation.size() != 0) { |
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| 88 | stream << " thrown at " << mLocation << "\n"; |
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| 89 | } |
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| 90 | #ifdef USE_EXECINFO |
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| 91 | printCallStack(stream); |
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| 92 | #endif |
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| 93 | if (mReason) { |
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| 94 | stream << "caused by: "; |
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| 95 | mReason->print(stream); |
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| 96 | } |
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| 97 | stream.flush(); |
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| 98 | } |
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| 99 | |
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| 100 | /** |
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| 101 | * Result of print() as a string. |
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| 102 | */ |
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| 103 | string Exception::toString() const { |
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| 104 | std::ostringstream stream; |
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| 105 | print(stream); |
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| 106 | return stream.str(); |
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| 107 | } |
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| 108 | |
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| 109 | #ifdef USE_EXECINFO |
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| 110 | /** |
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| 111 | * Print the call stack where the exception was created. |
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| 112 | */ |
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| 113 | void Exception::printCallStack(std::ostream& stream) const { |
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| 114 | char ** symbols = backtrace_symbols(mCallStack, mCalls); |
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| 115 | for(int i=0; i < mCalls; ++i) { |
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| 116 | stream << " "; |
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| 117 | if (i == 0) { |
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| 118 | stream << "at "; |
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| 119 | } else { |
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| 120 | stream << "from "; |
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| 121 | } |
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| 122 | stream << symbols[i] << "\n"; |
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| 123 | } |
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| 124 | free(symbols); |
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| 125 | } |
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| 126 | #endif |
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| 127 | |
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| 128 | const char* Exception::getTypename() const { |
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| 129 | return "Exception"; |
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| 130 | } |
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| 131 | |
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| 132 | Exception* Exception::clone() const { |
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| 133 | return new Exception(*this); |
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| 134 | } |
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| 135 | |
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| 136 | IOException::IOException(const string& message, |
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| 137 | const string& component, |
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| 138 | const string& location, |
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| 139 | const Exception* reason |
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| 140 | ): Exception(message, component, location, reason) |
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| 141 | { |
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| 142 | } |
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| 143 | |
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| 144 | const char* IOException::getTypename() const { |
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| 145 | return "IOException"; |
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| 146 | } |
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| 147 | |
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| 148 | IOException* IOException::clone() const { |
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| 149 | return new IOException(*this); |
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| 150 | } |
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| 151 | |
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| 152 | } |
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