ALooperRoster.cpp revision 5df775d2f509c76e76a46615fca83dba95299f6e 
1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17//#define LOG_NDEBUG 0
18#define LOG_TAG "ALooperRoster"
19#include <utils/Log.h>
20
21#include "ALooperRoster.h"
22
23#include "ADebug.h"
24#include "AHandler.h"
25#include "AMessage.h"
26
27namespace android {
28
29ALooperRoster::ALooperRoster()
30    : mNextHandlerID(1),
31      mNextReplyID(1) {
32}
33
34ALooper::handler_id ALooperRoster::registerHandler(
35        const sp<ALooper> looper, const sp<AHandler> &handler) {
36    Mutex::Autolock autoLock(mLock);
37
38    if (handler->id() != 0) {
39        CHECK(!"A handler must only be registered once.");
40        return INVALID_OPERATION;
41    }
42
43    HandlerInfo info;
44    info.mLooper = looper;
45    info.mHandler = handler;
46    ALooper::handler_id handlerID = mNextHandlerID++;
47    mHandlers.add(handlerID, info);
48
49    handler->setID(handlerID);
50
51    return handlerID;
52}
53
54void ALooperRoster::unregisterHandler(ALooper::handler_id handlerID) {
55    Mutex::Autolock autoLock(mLock);
56
57    ssize_t index = mHandlers.indexOfKey(handlerID);
58
59    if (index < 0) {
60        return;
61    }
62
63    const HandlerInfo &info = mHandlers.valueAt(index);
64
65    sp<AHandler> handler = info.mHandler.promote();
66
67    if (handler != NULL) {
68        handler->setID(0);
69    }
70
71    mHandlers.removeItemsAt(index);
72}
73
74status_t ALooperRoster::postMessage(
75        const sp<AMessage> &msg, int64_t delayUs) {
76    Mutex::Autolock autoLock(mLock);
77    return postMessage_l(msg, delayUs);
78}
79
80status_t ALooperRoster::postMessage_l(
81        const sp<AMessage> &msg, int64_t delayUs) {
82    ssize_t index = mHandlers.indexOfKey(msg->target());
83
84    if (index < 0) {
85        LOGW("failed to post message. Target handler not registered.");
86        return -ENOENT;
87    }
88
89    const HandlerInfo &info = mHandlers.valueAt(index);
90
91    sp<ALooper> looper = info.mLooper.promote();
92
93    if (looper == NULL) {
94        LOGW("failed to post message. "
95             "Target handler %d still registered, but object gone.",
96             msg->target());
97
98        mHandlers.removeItemsAt(index);
99        return -ENOENT;
100    }
101
102    looper->post(msg, delayUs);
103
104    return OK;
105}
106
107void ALooperRoster::deliverMessage(const sp<AMessage> &msg) {
108    sp<AHandler> handler;
109
110    {
111        Mutex::Autolock autoLock(mLock);
112
113        ssize_t index = mHandlers.indexOfKey(msg->target());
114
115        if (index < 0) {
116            LOGW("failed to deliver message. Target handler not registered.");
117            return;
118        }
119
120        const HandlerInfo &info = mHandlers.valueAt(index);
121        handler = info.mHandler.promote();
122
123        if (handler == NULL) {
124            LOGW("failed to deliver message. "
125                 "Target handler %d registered, but object gone.",
126                 msg->target());
127
128            mHandlers.removeItemsAt(index);
129            return;
130        }
131    }
132
133    handler->onMessageReceived(msg);
134}
135
136sp<ALooper> ALooperRoster::findLooper(ALooper::handler_id handlerID) {
137    Mutex::Autolock autoLock(mLock);
138
139    ssize_t index = mHandlers.indexOfKey(handlerID);
140
141    if (index < 0) {
142        return NULL;
143    }
144
145    sp<ALooper> looper = mHandlers.valueAt(index).mLooper.promote();
146
147    if (looper == NULL) {
148        mHandlers.removeItemsAt(index);
149        return NULL;
150    }
151
152    return looper;
153}
154
155status_t ALooperRoster::postAndAwaitResponse(
156        const sp<AMessage> &msg, sp<AMessage> *response) {
157    Mutex::Autolock autoLock(mLock);
158
159    uint32_t replyID = mNextReplyID++;
160
161    msg->setInt32("replyID", replyID);
162
163    status_t err = postMessage_l(msg, 0 /* delayUs */);
164
165    if (err != OK) {
166        response->clear();
167        return err;
168    }
169
170    ssize_t index;
171    while ((index = mReplies.indexOfKey(replyID)) < 0) {
172        mRepliesCondition.wait(mLock);
173    }
174
175    *response = mReplies.valueAt(index);
176    mReplies.removeItemsAt(index);
177
178    return OK;
179}
180
181void ALooperRoster::postReply(uint32_t replyID, const sp<AMessage> &reply) {
182    Mutex::Autolock autoLock(mLock);
183
184    CHECK(mReplies.indexOfKey(replyID) < 0);
185    mReplies.add(replyID, reply);
186    mRepliesCondition.broadcast();
187}
188
189}  // namespace android
190