android 系统数据业务---打开
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2数据业务打开
DcTracker的onTrySetupData调用流程图如下,
onTrySetupData方法如下,
protected boolean onTrySetupData(String reason) { if (DBG) log("onTrySetupData: reason=" + reason); setupDataOnConnectableApns(reason);//利用可连接的APN进行拨号 return true;}
setupDataOnConnectableApns方法如下,
private void setupDataOnConnectableApns(String reason) { setupDataOnConnectableApns(reason, RetryFailures.ALWAYS);}
这里RetryFailures.ALWAYS表示连网失败话,会一直重试。
trySetupData主要根据当前终端的运行状态,判断框架是否应该继续拨号。
setupData主要逻辑如下,
1,首先根据一些列的条件进行判断,然后创建一个DataConnection对象,
if (dcac == null) { dcac = createDataConnection();}
2,创建成功后,更新状态,
apnContext.setDataConnectionAc(dcac);apnContext.setApnSetting(apnSetting);apnContext.setState(DctConstants.State.CONNECTING);mPhone.notifyDataConnection(apnContext.getReason(), apnContext.getApnType());Message msg = obtainMessage();msg.what = DctConstants.EVENT_DATA_SETUP_COMPLETE;msg.obj = apnContext;//调用DcAsyncChannel的bringUp函数进行拨号上网dcac.bringUp(apnContext, getInitialMaxRetry(), profileId, radioTech, mAutoAttachOnCreation, msg);
首先调用createDataConnection方法构造DataConnection和DcAsyncChannel对象,
然后调用调用DcAsyncChannel的bringUp函数进行拨号上网。
2.1 createDataConnection
createDataConnection的调用流程图如下,
createDataConnection方法如下,
private DcAsyncChannel createDataConnection() { if (DBG) log("createDataConnection E"); //每个DataConnection有唯一的id号int id = mUniqueIdGenerator.getAndIncrement(); DataConnection conn = DataConnection.makeDataConnection(mPhone, id, this, mDcTesterFailBringUpAll, mDcc);mDataConnections.put(id, conn); //创建DcAsyncChannelDcAsyncChannel dcac = new DcAsyncChannel(conn, LOG_TAG);//完成dctracker与dataconnection之间handler的绑定 int status = dcac.fullyConnectSync(mPhone.getContext(), this, conn.getHandler()); if (status == AsyncChannel.STATUS_SUCCESSFUL) { mDataConnectionAcHashMap.put(dcac.getDataConnectionIdSync(), dcac); } else { loge("createDataConnection: Could not connect to dcac=" + dcac + " status=" + status); } if (DBG) log("createDataConnection() X id=" + id + " dc=" + conn); return dcac;}
其实就是创建了2个对象, DataConnection和DcAsyncChannel,然后将2个对象通过Handler绑定,主要是为了通信。
1,创建DataConnection
DataConnection的makeDataConnection方法如下,
static DataConnection makeDataConnection(PhoneBase phone, int id, DcTrackerBase dct, DcTesterFailBringUpAll failBringUpAll, DcController dcc) { DataConnection dc = new DataConnection(phone, "DC-" + mInstanceNumber.incrementAndGet(), id, dct, failBringUpAll, dcc); dc.start(); if (DBG) dc.log("Made " + dc.getName()); return dc;}
首先构造DataConnection对象, DataConnection其实是一个状态机, DataConnection类的定义如下,
public final class DataConnection extends StateMachine {
这个状态机有7种状态,初始状态为
addState(mDefaultState);//默认状态addState(mInactiveState, mDefaultState);//未激活状态addState(mActivatingState, mDefaultState);//正在激活状态addState(mRetryingState, mDefaultState);//尝试激活状态addState(mActiveState, mDefaultState);//已激活状态addState(mDisconnectingState, mDefaultState);//正在断开状态addState(mDisconnectingErrorCreatingConnection, mDefaultState);//错误状态setInitialState(mInactiveState);//初始状态
状态机构造完成之后,就启动状态机。
2,创建DcAsyncChannel对象,并绑定
DcAsyncChannel定义如下,
public class DcAsyncChannel extends AsyncChannel {
DcAsyncChannel继承于AsyncChannel,其详细原理请见····
2.2拨号过程
DcAsyncChannel的bringUp方法直接发送消息,
sendMessage(DataConnection.EVENT_CONNECT, new ConnectionParams(apnContext, initialMaxRetry, profileId, rilRadioTechnology, retryWhenSSChange, onCompletedMsg));
直接回调DataConnection状态机的processMessage方法, DataConnection有6个状态,调用哪个的
processMessage方法呢?上个小结中说过,初始状态为DcInactiveState,因此直接调用DcInactiveState
的processMessage方法,对EVENT_CONNECT消息的处理如下,
ConnectionParams cp = (ConnectionParams) msg.obj;//获取消息if (initConnection(cp)) { onConnect(mConnectionParams);//进行拨号 transitionTo(mActivatingState);//进入ActivatingState状态} else { ••• notifyConnectCompleted(cp, DcFailCause.UNACCEPTABLE_NETWORK_PARAMETER, false); //通知DcTracker拨号失败}retVal = HANDLED;break;
首先调用onConnect进行拨号,然后调用transitionTo方法进入ActivatingState状态。
onConnect方法主要逻辑如下,
Message msg = obtainMessage(EVENT_SETUP_DATA_CONNECTION_DONE, cp);msg.obj = cp; // 构建Message对象•••//利用DcAsyncChannel传输的ConnectionParams信息调用RIL的setupDataCall进行拨号mPhone.mCi.setupDataCall(Integer.toString(cp.mRilRat + 2), Integer.toString(cp.mProfileId), mApnSetting.apn, mApnSetting.user, mApnSetting.password, Integer.toString(authType), protocol, msg);
RIL的setupDataCall方法如下,
setupDataCall(String radioTechnology, String profile, String apn, String user, String password, String authType, String protocol, Message result) { //构造RILRequest对象 RILRequest rr = RILRequest.obtain(RIL_REQUEST_SETUP_DATA_CALL, result); //封装消息rr.mParcel.writeInt(7); rr.mParcel.writeString(radioTechnology); rr.mParcel.writeString(profile); rr.mParcel.writeString(apn); rr.mParcel.writeString(user); rr.mParcel.writeString(password); rr.mParcel.writeString(authType); rr.mParcel.writeString(protocol); if (RILJ_LOGD) riljLog(rr.serialString() + "> " + requestToString(rr.mRequest) + " " + radioTechnology + " " + profile + " " + apn + " " + user + " " + password + " " + authType + " " + protocol); send(rr); //调用send方法发送消息 }
具体的RIL机制在此就不论述了,本文的重点不在于RIL机制,
只需要知道的是当收到RIL_REQUEST_SETUP_DATA_CALL消息时, 将向DataConnection发送
EVENT_SETUP_DATA_CONNECTION_DONE的消息.
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