1 | /* |
2 | * Copyright (C) 2006 Justin Karneges <justin@affinix.com> |
3 | * |
4 | * This library is free software; you can redistribute it and/or |
5 | * modify it under the terms of the GNU Lesser General Public |
6 | * License as published by the Free Software Foundation; either |
7 | * version 2.1 of the License, or (at your option) any later version. |
8 | * |
9 | * This library is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | * Lesser General Public License for more details. |
13 | * |
14 | * You should have received a copy of the GNU Lesser General Public |
15 | * License along with this library; if not, write to the Free Software |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
17 | * 02110-1301 USA |
18 | * |
19 | */ |
20 | |
21 | #include "qca_support.h" |
22 | |
23 | #include <QEventLoop> |
24 | #include <QMetaMethod> |
25 | #include <QMutexLocker> |
26 | #include <QWaitCondition> |
27 | |
28 | namespace QCA { |
29 | |
30 | #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0) |
31 | int methodReturnType(const QMetaObject *obj, const QByteArray &method, const QList<QByteArray> &argTypes) |
32 | #else |
33 | QByteArray methodReturnType( |
34 | const QMetaObject *obj, |
35 | const QByteArray &method, |
36 | const QList<QByteArray> argTypes) // clazy:exclude=function-args-by-ref NOLINT(performance-unnecessary-value-param) |
37 | // TODO make argTypes const & when we break ABI |
38 | #endif |
39 | { |
40 | for (int n = 0; n < obj->methodCount(); ++n) { |
41 | QMetaMethod m = obj->method(index: n); |
42 | const QByteArray sig = m.methodSignature(); |
43 | int offset = sig.indexOf(c: '('); |
44 | if (offset == -1) |
45 | continue; |
46 | const QByteArray name = sig.mid(index: 0, len: offset); |
47 | if (name != method) |
48 | continue; |
49 | if (m.parameterTypes() != argTypes) |
50 | continue; |
51 | |
52 | #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0) |
53 | return m.returnType(); |
54 | #else |
55 | return m.typeName(); |
56 | #endif |
57 | } |
58 | #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0) |
59 | return QMetaType::UnknownType; |
60 | #else |
61 | return QByteArray(); |
62 | #endif |
63 | } |
64 | |
65 | bool invokeMethodWithVariants(QObject *obj, |
66 | const QByteArray &method, |
67 | const QVariantList &args, |
68 | QVariant *ret, |
69 | Qt::ConnectionType type) |
70 | { |
71 | // QMetaObject::invokeMethod() has a 10 argument maximum |
72 | if (args.count() > 10) |
73 | return false; |
74 | |
75 | QList<QByteArray> argTypes; |
76 | for (int n = 0; n < args.count(); ++n) { |
77 | argTypes += args[n].typeName(); |
78 | } |
79 | |
80 | // get return type |
81 | #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0) |
82 | const auto metatype = methodReturnType(obj: obj->metaObject(), method, argTypes); |
83 | if (metatype == QMetaType::UnknownType) { |
84 | return false; |
85 | } |
86 | #else |
87 | int metatype = QMetaType::Void; |
88 | const QByteArray retTypeName = methodReturnType(obj->metaObject(), method, argTypes); |
89 | if (!retTypeName.isEmpty() && retTypeName != "void" ) { |
90 | metatype = QMetaType::type(retTypeName.data()); |
91 | if (metatype == QMetaType::UnknownType) // lookup failed |
92 | return false; |
93 | } |
94 | #endif |
95 | |
96 | QGenericArgument arg[10]; |
97 | for (int n = 0; n < args.count(); ++n) |
98 | arg[n] = QGenericArgument(args[n].typeName(), args[n].constData()); |
99 | |
100 | QGenericReturnArgument retarg; |
101 | QVariant retval; |
102 | |
103 | if (metatype != QMetaType::Void) { |
104 | #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0) |
105 | retval = QVariant(QMetaType {metatype}, (const void *)nullptr); |
106 | #else |
107 | retval = QVariant(metatype, (const void *)nullptr); |
108 | #endif |
109 | retarg = QGenericReturnArgument(retval.typeName(), retval.data()); |
110 | } |
111 | |
112 | if (!QMetaObject::invokeMethod(obj, |
113 | member: method.data(), |
114 | type, |
115 | ret: retarg, |
116 | val0: arg[0], |
117 | val1: arg[1], |
118 | val2: arg[2], |
119 | val3: arg[3], |
120 | val4: arg[4], |
121 | val5: arg[5], |
122 | val6: arg[6], |
123 | val7: arg[7], |
124 | val8: arg[8], |
125 | val9: arg[9])) |
126 | return false; |
127 | |
128 | if (retval.isValid() && ret) |
129 | *ret = retval; |
130 | return true; |
131 | } |
132 | |
133 | //---------------------------------------------------------------------------- |
134 | // SyncThread |
135 | //---------------------------------------------------------------------------- |
136 | class SyncThreadAgent; |
137 | |
138 | class SyncThread::Private : public QObject |
139 | { |
140 | Q_OBJECT |
141 | public: |
142 | SyncThread *q; |
143 | QMutex m; |
144 | QWaitCondition w; |
145 | QEventLoop *loop; |
146 | SyncThreadAgent *agent; |
147 | bool last_success; |
148 | QVariant last_ret; |
149 | |
150 | Private(SyncThread *_q) |
151 | : QObject(_q) |
152 | , q(_q) |
153 | { |
154 | loop = nullptr; |
155 | agent = nullptr; |
156 | } |
157 | |
158 | public Q_SLOTS: |
159 | void agent_started(); |
160 | void agent_call_ret(bool success, const QVariant &ret); |
161 | }; |
162 | |
163 | class SyncThreadAgent : public QObject |
164 | { |
165 | Q_OBJECT |
166 | public: |
167 | SyncThreadAgent(QObject *parent = nullptr) |
168 | : QObject(parent) |
169 | { |
170 | QMetaObject::invokeMethod(obj: this, member: "started" , c: Qt::QueuedConnection); |
171 | } |
172 | |
173 | Q_SIGNALS: |
174 | void started(); |
175 | void call_ret(bool success, const QVariant &ret); |
176 | |
177 | public Q_SLOTS: |
178 | void call_do(QObject *obj, const QByteArray &method, const QVariantList &args) |
179 | { |
180 | QVariant ret; |
181 | bool ok = invokeMethodWithVariants(obj, method, args, ret: &ret, type: Qt::DirectConnection); |
182 | emit call_ret(success: ok, ret); |
183 | } |
184 | }; |
185 | |
186 | SyncThread::SyncThread(QObject *parent) |
187 | : QThread(parent) |
188 | { |
189 | d = new Private(this); |
190 | qRegisterMetaType<QVariant>(typeName: "QVariant" ); |
191 | qRegisterMetaType<QVariantList>(typeName: "QVariantList" ); |
192 | } |
193 | |
194 | SyncThread::~SyncThread() |
195 | { |
196 | stop(); |
197 | delete d; |
198 | } |
199 | |
200 | void SyncThread::start() |
201 | { |
202 | QMutexLocker locker(&d->m); |
203 | Q_ASSERT(!d->loop); |
204 | QThread::start(); |
205 | d->w.wait(lockedMutex: &d->m); |
206 | } |
207 | |
208 | void SyncThread::stop() |
209 | { |
210 | QMutexLocker locker(&d->m); |
211 | if (!d->loop) |
212 | return; |
213 | QMetaObject::invokeMethod(obj: d->loop, member: "quit" ); |
214 | d->w.wait(lockedMutex: &d->m); |
215 | wait(); |
216 | } |
217 | |
218 | QVariant SyncThread::call(QObject *obj, const QByteArray &method, const QVariantList &args, bool *ok) |
219 | { |
220 | QMutexLocker locker(&d->m); |
221 | bool ret; |
222 | Q_UNUSED(ret); // In really ret is used. I use this hack to suppress a compiler warning |
223 | // clang-format off |
224 | // Otherwise the QObject* gets turned into Object * that is not normalized and is slightly slower |
225 | ret = QMetaObject::invokeMethod(obj: d->agent, member: "call_do" , |
226 | c: Qt::QueuedConnection, Q_ARG(QObject*, obj), |
227 | Q_ARG(QByteArray, method), Q_ARG(QVariantList, args)); |
228 | // clang-format on |
229 | Q_ASSERT(ret); |
230 | d->w.wait(lockedMutex: &d->m); |
231 | if (ok) |
232 | *ok = d->last_success; |
233 | QVariant v = d->last_ret; |
234 | d->last_ret = QVariant(); |
235 | return v; |
236 | } |
237 | |
238 | void SyncThread::run() |
239 | { |
240 | d->m.lock(); |
241 | d->loop = new QEventLoop; |
242 | d->agent = new SyncThreadAgent; |
243 | connect(sender: d->agent, signal: &SyncThreadAgent::started, context: d, slot: &Private::agent_started, type: Qt::DirectConnection); |
244 | connect(sender: d->agent, signal: &SyncThreadAgent::call_ret, context: d, slot: &Private::agent_call_ret, type: Qt::DirectConnection); |
245 | d->loop->exec(); |
246 | d->m.lock(); |
247 | atEnd(); |
248 | delete d->agent; |
249 | delete d->loop; |
250 | d->agent = nullptr; |
251 | d->loop = nullptr; |
252 | d->w.wakeOne(); |
253 | d->m.unlock(); |
254 | } |
255 | |
256 | void SyncThread::Private::agent_started() |
257 | { |
258 | q->atStart(); |
259 | w.wakeOne(); |
260 | m.unlock(); |
261 | } |
262 | |
263 | void SyncThread::Private::agent_call_ret(bool success, const QVariant &ret) |
264 | { |
265 | QMutexLocker locker(&m); |
266 | last_success = success; |
267 | last_ret = ret; |
268 | w.wakeOne(); |
269 | } |
270 | |
271 | } |
272 | |
273 | #include "syncthread.moc" |
274 | |