sendmessage Service的工作过程使用Android O(8.0) A(3)

在方法中会调用bringUpServiceLocked方法.对于ServiceRecord ：用来描述Service组件当一个应用程序进程绑定了一个Service组件之后，用来描述这个应用程序进程的一个ProcessRecord对象就会被保存在用来描述这个被绑定的Service组件的一个ServiceRecord对象的成员变量bindings中,由于一个Service组件可能会被多个应用程序绑定，因此，用来描述这个Service

    final void performServiceRestartLocked(ServiceRecord r) {
        if (!mRestartingServices.contains(r)) {
            return;
        }
     ...
        try {
            bringUpServiceLocked(r, r.intent.getIntent().getFlags(), r.createdFromFg, true, false);
        } catch (TransactionTooLargeException e) {
            // Ignore, its been logged and nothing upstack cares.
        }
    }

private String bringUpServiceLocked(ServiceRecord r, int intentFlags, boolean execInFg,
            boolean whileRestarting, boolean permissionsReviewRequired)
            throws TransactionTooLargeException {
        //Slog.i(TAG, "Bring up service:");
        //r.dump("  ");
        ...
        final boolean isolated = (r.serviceInfo.flags&ServiceInfo.FLAG_ISOLATED_PROCESS) != 0;
        final String procName = r.processName;
        String hostingType = "service";
        ProcessRecord app;

        if (!isolated) {
            app = mAm.getProcessRecordLocked(procName, r.appInfo.uid, false);
            if (DEBUG_MU) Slog.v(TAG_MU, "bringUpServiceLocked: appInfo.uid=" + r.appInfo.uid
                        + " app=" + app);
            if (app != null && app.thread != null) {
                try {
                    app.addPackage(r.appInfo.packageName, r.appInfo.versionCode, mAm.mProcessStats);
                    realStartServiceLocked(r, app, execInFg);
                    return null;
                } catch (TransactionTooLargeException e) {
                    throw e;
                } catch (RemoteException e) {
                    Slog.w(TAG, "Exception when starting service " + r.shortName, e);
                }

                // If a dead object exception was thrown -- fall through to
                // restart the application.
            }
        }
        return null;
    }

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