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/*
* Copyright (C) 2010 The Android Open Source Project
*
* 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.
*/
//#define LOG_NDEBUG 0
#define LOG_TAG "ALooperRoster"
#include <utils/Log.h>
#include <utils/String8.h>
#include "ALooperRoster.h"
#include "ADebug.h"
#include "AHandler.h"
#include "AMessage.h"
namespace android {
static bool verboseStats = false;
ALooperRoster::ALooperRoster()
: mNextHandlerID(1),
mNextReplyID(1) {
}
ALooper::handler_id ALooperRoster::registerHandler(
const sp<ALooper> looper, const sp<AHandler> &handler) {
Mutex::Autolock autoLock(mLock);
if (handler->id() != 0) {
CHECK(!"A handler must only be registered once.");
return INVALID_OPERATION;
}
HandlerInfo info;
info.mLooper = looper;
info.mHandler = handler;
ALooper::handler_id handlerID = mNextHandlerID++;
mHandlers.add(handlerID, info);
handler->setID(handlerID, looper);
return handlerID;
}
void ALooperRoster::unregisterHandler(ALooper::handler_id handlerID) {
Mutex::Autolock autoLock(mLock);
ssize_t index = mHandlers.indexOfKey(handlerID);
if (index < 0) {
return;
}
const HandlerInfo &info = mHandlers.valueAt(index);
sp<AHandler> handler = info.mHandler.promote();
if (handler != NULL) {
handler->setID(0, NULL);
}
mHandlers.removeItemsAt(index);
}
void ALooperRoster::unregisterStaleHandlers() {
Vector<sp<ALooper> > activeLoopers;
{
Mutex::Autolock autoLock(mLock);
for (size_t i = mHandlers.size(); i-- > 0;) {
const HandlerInfo &info = mHandlers.valueAt(i);
sp<ALooper> looper = info.mLooper.promote();
if (looper == NULL) {
ALOGV("Unregistering stale handler %d", mHandlers.keyAt(i));
mHandlers.removeItemsAt(i);
} else {
// At this point 'looper' might be the only sp<> keeping
// the object alive. To prevent it from going out of scope
// and having ~ALooper call this method again recursively
// and then deadlocking because of the Autolock above, add
// it to a Vector which will go out of scope after the lock
// has been released.
activeLoopers.add(looper);
}
}
}
}
void ALooperRoster::getHandlerAndLooper(
ALooper::handler_id handlerID, wp<AHandler> *handler, wp<ALooper> *looper) {
Mutex::Autolock autoLock(mLock);
ssize_t index = mHandlers.indexOfKey(handlerID);
if (index < 0) {
handler->clear();
looper->clear();
return;
}
*handler = mHandlers.valueAt(index).mHandler;
*looper = mHandlers.valueAt(index).mLooper;
}
status_t ALooperRoster::postAndAwaitResponse(
const sp<AMessage> &msg, sp<AMessage> *response) {
Mutex::Autolock autoLock(mLock);
uint32_t replyID = mNextReplyID++;
msg->setInt32("replyID", replyID);
status_t err = msg->post(0 /* delayUs */);
if (err != OK) {
response->clear();
return err;
}
ssize_t index;
while ((index = mReplies.indexOfKey(replyID)) < 0) {
mRepliesCondition.wait(mLock);
}
*response = mReplies.valueAt(index);
mReplies.removeItemsAt(index);
return OK;
}
void ALooperRoster::postReply(uint32_t replyID, const sp<AMessage> &reply) {
Mutex::Autolock autoLock(mLock);
CHECK(mReplies.indexOfKey(replyID) < 0);
mReplies.add(replyID, reply);
mRepliesCondition.broadcast();
}
static void makeFourCC(uint32_t fourcc, char *s) {
s[0] = (fourcc >> 24) & 0xff;
if (s[0]) {
s[1] = (fourcc >> 16) & 0xff;
s[2] = (fourcc >> 8) & 0xff;
s[3] = fourcc & 0xff;
s[4] = 0;
} else {
sprintf(s, "%u", fourcc);
}
}
void ALooperRoster::dump(int fd, const Vector<String16>& args) {
bool clear = false;
bool oldVerbose = verboseStats;
for (size_t i = 0; i < args.size(); i++) {
if (args[i] == String16("-c")) {
clear = true;
} else if (args[i] == String16("-von")) {
verboseStats = true;
} else if (args[i] == String16("-voff")) {
verboseStats = false;
}
}
String8 s;
if (verboseStats && !oldVerbose) {
s.append("(verbose stats collection enabled, stats will be cleared)\n");
}
Mutex::Autolock autoLock(mLock);
size_t n = mHandlers.size();
s.appendFormat(" %zu registered handlers:\n", n);
for (size_t i = 0; i < n; i++) {
s.appendFormat(" %d: ", mHandlers.keyAt(i));
HandlerInfo &info = mHandlers.editValueAt(i);
sp<ALooper> looper = info.mLooper.promote();
if (looper != NULL) {
s.append(looper->getName());
sp<AHandler> handler = info.mHandler.promote();
if (handler != NULL) {
handler->mVerboseStats = verboseStats;
s.appendFormat(": %u messages processed", handler->mMessageCounter);
if (verboseStats) {
for (size_t j = 0; j < handler->mMessages.size(); j++) {
char fourcc[15];
makeFourCC(handler->mMessages.keyAt(j), fourcc);
s.appendFormat("\n %s: %u",
fourcc,
handler->mMessages.valueAt(j));
}
} else {
handler->mMessages.clear();
}
if (clear || (verboseStats && !oldVerbose)) {
handler->mMessageCounter = 0;
handler->mMessages.clear();
}
} else {
s.append(": <stale handler>");
}
} else {
s.append("<stale>");
}
s.append("\n");
}
write(fd, s.string(), s.size());
}
} // namespace android
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