Back to index

lightning-sunbird  0.9+nobinonly
Public Member Functions | Public Attributes | Private Member Functions | Private Attributes
nsPrefetchService Class Reference

#include <nsPrefetchService.h>

Inheritance diagram for nsPrefetchService:
Inheritance graph
[legend]
Collaboration diagram for nsPrefetchService:
Collaboration graph
[legend]

List of all members.

Public Member Functions

NS_DECL_ISUPPORTS
NS_DECL_NSIPREFETCHSERVICE
NS_DECL_NSIWEBPROGRESSLISTENER
NS_DECL_NSIOBSERVER 
nsPrefetchService ()
nsresult Init ()
void ProcessNextURI ()
void UpdateCurrentChannel (nsIChannel *c)
void prefetchURI (in nsIURI aURI, in nsIURI aReferrerURI, in boolean aExplicit)
 Enqueue a request to prefetch the specified URI.
void onStateChange (in nsIWebProgress aWebProgress, in nsIRequest aRequest, in unsigned long aStateFlags, in nsresult aStatus)
 Notification indicating the state has changed for one of the requests associated with aWebProgress.
void onProgressChange (in nsIWebProgress aWebProgress, in nsIRequest aRequest, in long aCurSelfProgress, in long aMaxSelfProgress, in long aCurTotalProgress, in long aMaxTotalProgress)
 Notification that the progress has changed for one of the requests associated with aWebProgress.
void onLocationChange (in nsIWebProgress aWebProgress, in nsIRequest aRequest, in nsIURI aLocation)
 Called when the location of the window being watched changes.
void onStatusChange (in nsIWebProgress aWebProgress, in nsIRequest aRequest, in nsresult aStatus, in wstring aMessage)
 Notification that the status of a request has changed.
void onSecurityChange (in nsIWebProgress aWebProgress, in nsIRequest aRequest, in unsigned long aState)
 Notification called for security progress.
void observe (in nsISupports aSubject, in string aTopic, in wstring aData)
 Observe will be called when there is a notification for the topic |aTopic|.

Public Attributes

const unsigned long STATE_START = 0x00000001
 State Transition Flags.
const unsigned long STATE_REDIRECTING = 0x00000002
const unsigned long STATE_TRANSFERRING = 0x00000004
const unsigned long STATE_NEGOTIATING = 0x00000008
const unsigned long STATE_STOP = 0x00000010
const unsigned long STATE_IS_REQUEST = 0x00010000
 State Type Flags.
const unsigned long STATE_IS_DOCUMENT = 0x00020000
const unsigned long STATE_IS_NETWORK = 0x00040000
const unsigned long STATE_IS_WINDOW = 0x00080000
const unsigned long STATE_RESTORING = 0x01000000
 State Modifier Flags.
const unsigned long STATE_IS_INSECURE = 0x00000004
 State Security Flags.
const unsigned long STATE_IS_BROKEN = 0x00000001
const unsigned long STATE_IS_SECURE = 0x00000002
const unsigned long STATE_SECURE_HIGH = 0x00040000
 Security Strength Flags.
const unsigned long STATE_SECURE_MED = 0x00010000
const unsigned long STATE_SECURE_LOW = 0x00020000

Private Member Functions

 ~nsPrefetchService ()
void AddProgressListener ()
void RemoveProgressListener ()
nsresult EnqueueURI (nsIURI *aURI, nsIURI *aReferrerURI)
nsresult DequeueURI (nsIURI **aURI, nsIURI **aReferrerURI)
void EmptyQueue ()
void StartPrefetching ()
void StopPrefetching ()

Private Attributes

nsPrefetchNodemQueueHead
nsPrefetchNodemQueueTail
nsCOMPtr< nsIChannelmCurrentChannel
PRInt32 mStopCount
PRBool mDisabled

Detailed Description

Definition at line 61 of file nsPrefetchService.h.


Constructor & Destructor Documentation

Definition at line 255 of file nsPrefetchService.cpp.

Definition at line 263 of file nsPrefetchService.cpp.

{
    // cannot reach destructor if prefetch in progress (listener owns reference
    // to this service)
    EmptyQueue();
}

Here is the call graph for this function:


Member Function Documentation

Definition at line 356 of file nsPrefetchService.cpp.

{
    // Register as an observer for the document loader  
    nsCOMPtr<nsIWebProgress> progress(do_GetService(kDocLoaderServiceCID));
    if (progress)
        progress->AddProgressListener(this, nsIWebProgress::NOTIFY_STATE_DOCUMENT);
}

Here is the call graph for this function:

Here is the caller graph for this function:

nsresult nsPrefetchService::DequeueURI ( nsIURI **  aURI,
nsIURI **  aReferrerURI 
) [private]

Definition at line 393 of file nsPrefetchService.cpp.

{
    if (!mQueueHead)
        return NS_ERROR_NOT_AVAILABLE;

    // remove from the head
    NS_ADDREF(*aURI = mQueueHead->mURI);
    NS_ADDREF(*aReferrerURI = mQueueHead->mReferrerURI);

    nsPrefetchNode *node = mQueueHead;
    mQueueHead = mQueueHead->mNext;
    delete node;

    if (!mQueueHead)
        mQueueTail = nsnull;

    return NS_OK;
}

Here is the call graph for this function:

Here is the caller graph for this function:

Definition at line 413 of file nsPrefetchService.cpp.

{
    nsresult rv;
    nsCOMPtr<nsIURI> uri, referrer;

    do {
        rv = DequeueURI(getter_AddRefs(uri),
                        getter_AddRefs(referrer));
    }
    while (NS_SUCCEEDED(rv));
}

Here is the call graph for this function:

Here is the caller graph for this function:

nsresult nsPrefetchService::EnqueueURI ( nsIURI aURI,
nsIURI aReferrerURI 
) [private]

Definition at line 374 of file nsPrefetchService.cpp.

{
    nsPrefetchNode *node = new nsPrefetchNode(aURI, aReferrerURI);
    if (!node)
        return NS_ERROR_OUT_OF_MEMORY;

    if (!mQueueTail) {
        mQueueHead = node;
        mQueueTail = node;
    }
    else {
        mQueueTail->mNext = node;
        mQueueTail = node;
    }

    return NS_OK;
}

Definition at line 271 of file nsPrefetchService.cpp.

{
#if defined(PR_LOGGING)
    if (!gPrefetchLog)
        gPrefetchLog = PR_NewLogModule("nsPrefetch");
#endif

    nsresult rv;

    // read prefs and hook up pref observer
    nsCOMPtr<nsIPrefBranch2> prefs(do_GetService(kPrefServiceCID, &rv));
    if (NS_SUCCEEDED(rv)) {
      PRBool enabled;
      rv = prefs->GetBoolPref(PREFETCH_PREF, &enabled);
      if (NS_SUCCEEDED(rv) && enabled)
        mDisabled = PR_FALSE;

      prefs->AddObserver(PREFETCH_PREF, this, PR_TRUE);
    }

    // Observe xpcom-shutdown event
    nsCOMPtr<nsIObserverService> observerServ(
            do_GetService("@mozilla.org/observer-service;1", &rv));
    if (NS_FAILED(rv)) return rv;

    rv = observerServ->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, PR_TRUE);
    if (NS_FAILED(rv)) return rv;

    if (!mDisabled)
        AddProgressListener();

    return NS_OK;
}

Here is the call graph for this function:

void nsIObserver::observe ( in nsISupports  aSubject,
in string  aTopic,
in wstring  aData 
) [inherited]

Observe will be called when there is a notification for the topic |aTopic|.

This assumes that the object implementing this interface has been registered with an observer service such as the nsIObserverService.

If you expect multiple topics/subjects, the impl is responsible for filtering.

You should not modify, add, remove, or enumerate notifications in the implemention of observe.

Parameters:
aSubject: Notification specific interface pointer.
aTopic: The notification topic or subject.
aData: Notification specific wide string. subject event.
void nsIWebProgressListener::onLocationChange ( in nsIWebProgress  aWebProgress,
in nsIRequest  aRequest,
in nsIURI  aLocation 
) [inherited]

Called when the location of the window being watched changes.

This is not when a load is requested, but rather once it is verified that the load is going to occur in the given window. For instance, a load that starts in a window might send progress and status messages for the new site, but it will not send the onLocationChange until we are sure that we are loading this new page here.

Parameters:
aWebProgressThe nsIWebProgress instance that fired the notification.
aRequestThe associated nsIRequest. This may be null in some cases.
aLocationThe URI of the location that is being loaded.
void nsIWebProgressListener::onProgressChange ( in nsIWebProgress  aWebProgress,
in nsIRequest  aRequest,
in long  aCurSelfProgress,
in long  aMaxSelfProgress,
in long  aCurTotalProgress,
in long  aMaxTotalProgress 
) [inherited]

Notification that the progress has changed for one of the requests associated with aWebProgress.

Progress totals are reset to zero when all requests in aWebProgress complete (corresponding to onStateChange being called with aStateFlags including the STATE_STOP and STATE_IS_WINDOW flags).

Parameters:
aWebProgressThe nsIWebProgress instance that fired the notification.
aRequestThe nsIRequest that has new progress.
aCurSelfProgressThe current progress for aRequest.
aMaxSelfProgressThe maximum progress for aRequest.
aCurTotalProgressThe current progress for all requests associated with aWebProgress.
aMaxTotalProgressThe total progress for all requests associated with aWebProgress.

NOTE: If any progress value is unknown, or if its value would exceed the maximum value of type long, then its value is replaced with -1.

NOTE: If the object also implements nsIWebProgressListener2 and the caller knows about that interface, this function will not be called. Instead, nsIWebProgressListener2::onProgressChange64 will be called.

void nsIWebProgressListener::onSecurityChange ( in nsIWebProgress  aWebProgress,
in nsIRequest  aRequest,
in unsigned long  aState 
) [inherited]

Notification called for security progress.

This method will be called on security transitions (eg HTTP -> HTTPS, HTTPS -> HTTP, FOO -> HTTPS) and after document load completion. It might also be called if an error occurs during network loading.

Parameters:
aWebProgressThe nsIWebProgress instance that fired the notification.
aRequestThe nsIRequest that has new security state.
aStateA value composed of the Security State Flags and the Security Strength Flags listed above. Any undefined bits are reserved for future use.

NOTE: These notifications will only occur if a security package is installed.

void nsIWebProgressListener::onStateChange ( in nsIWebProgress  aWebProgress,
in nsIRequest  aRequest,
in unsigned long  aStateFlags,
in nsresult  aStatus 
) [inherited]

Notification indicating the state has changed for one of the requests associated with aWebProgress.

Parameters:
aWebProgressThe nsIWebProgress instance that fired the notification
aRequestThe nsIRequest that has changed state.
aStateFlagsFlags indicating the new state. This value is a combination of one of the State Transition Flags and one or more of the State Type Flags defined above. Any undefined bits are reserved for future use.
aStatusError status code associated with the state change. This parameter should be ignored unless aStateFlags includes the STATE_STOP bit. The status code indicates success or failure of the request associated with the state change. NOTE: aStatus may be a success code even for server generated errors, such as the HTTP 404 error. In such cases, the request itself should be queried for extended error information (e.g., for HTTP requests see nsIHttpChannel).
void nsIWebProgressListener::onStatusChange ( in nsIWebProgress  aWebProgress,
in nsIRequest  aRequest,
in nsresult  aStatus,
in wstring  aMessage 
) [inherited]

Notification that the status of a request has changed.

The status message is intended to be displayed to the user (e.g., in the status bar of the browser).

Parameters:
aWebProgressThe nsIWebProgress instance that fired the notification.
aRequestThe nsIRequest that has new status.
aStatusThis value is not an error code. Instead, it is a numeric value that indicates the current status of the request. This interface does not define the set of possible status codes. NOTE: Some status values are defined by nsITransport and nsISocketTransport.
aMessageLocalized text corresponding to aStatus.
void nsIPrefetchService::prefetchURI ( in nsIURI  aURI,
in nsIURI  aReferrerURI,
in boolean  aExplicit 
) [inherited]

Enqueue a request to prefetch the specified URI.

Parameters:
aURIthe URI of the document to prefetch
aReferrerURIthe URI of the referring page
aExplicitthe link element has an explicit prefetch link type

Definition at line 306 of file nsPrefetchService.cpp.

{
    nsresult rv;
    nsCOMPtr<nsIURI> uri, referrer;

    mCurrentChannel = nsnull;

    nsRefPtr<nsPrefetchListener> listener(new nsPrefetchListener(this));
    if (!listener) return;

    do {
        rv = DequeueURI(getter_AddRefs(uri), getter_AddRefs(referrer));
        if (NS_FAILED(rv)) break;

#if defined(PR_LOGGING)
        if (LOG_ENABLED()) {
            nsCAutoString spec;
            uri->GetSpec(spec);
            LOG(("ProcessNextURI [%s]\n", spec.get()));
        }
#endif

        //
        // if opening the channel fails, then just skip to the next uri
        //
        rv = NS_NewChannel(getter_AddRefs(mCurrentChannel), uri,
                           nsnull, nsnull, listener,
                           nsIRequest::LOAD_BACKGROUND |
                           nsICachingChannel::LOAD_ONLY_IF_MODIFIED);
        if (NS_FAILED(rv)) continue;

        // configure HTTP specific stuff
        nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(mCurrentChannel));
        if (httpChannel) {
            httpChannel->SetReferrer(referrer);
            httpChannel->SetRequestHeader(NS_LITERAL_CSTRING("X-Moz"),
                                          NS_LITERAL_CSTRING("prefetch"),
                                          PR_FALSE);
        }

        rv = mCurrentChannel->AsyncOpen(listener, nsnull);
    }
    while (NS_FAILED(rv));
}

Here is the call graph for this function:

Here is the caller graph for this function:

Definition at line 365 of file nsPrefetchService.cpp.

{
    // Register as an observer for the document loader  
    nsCOMPtr<nsIWebProgress> progress(do_GetService(kDocLoaderServiceCID));
    if (progress)
        progress->RemoveProgressListener(this);
}

Here is the call graph for this function:

Definition at line 426 of file nsPrefetchService.cpp.

{
    //
    // at initialization time we might miss the first DOCUMENT START
    // notification, so we have to be careful to avoid letting our
    // stop count go negative.
    //
    if (mStopCount > 0)
        mStopCount--;

    LOG(("StartPrefetching [stopcount=%d]\n", mStopCount));

    // only start prefetching after we've received enough DOCUMENT
    // STOP notifications.  we do this inorder to defer prefetching
    // until after all sub-frames have finished loading.
    if (mStopCount == 0 && !mCurrentChannel)
        ProcessNextURI();
}

Here is the call graph for this function:

Definition at line 446 of file nsPrefetchService.cpp.

{
    mStopCount++;

    LOG(("StopPrefetching [stopcount=%d]\n", mStopCount));

    // only kill the prefetch queue if we've actually started prefetching.
    if (!mCurrentChannel)
        return;

    mCurrentChannel->Cancel(NS_BINDING_ABORTED);
    mCurrentChannel = nsnull;
    EmptyQueue();
}

Here is the call graph for this function:

Definition at line 76 of file nsPrefetchService.h.


Member Data Documentation

Definition at line 91 of file nsPrefetchService.h.

Definition at line 93 of file nsPrefetchService.h.

Definition at line 89 of file nsPrefetchService.h.

Definition at line 90 of file nsPrefetchService.h.

Definition at line 92 of file nsPrefetchService.h.

const unsigned long nsIWebProgressListener::STATE_IS_BROKEN = 0x00000001 [inherited]

Definition at line 205 of file nsIWebProgressListener.idl.

const unsigned long nsIWebProgressListener::STATE_IS_DOCUMENT = 0x00020000 [inherited]

Definition at line 163 of file nsIWebProgressListener.idl.

const unsigned long nsIWebProgressListener::STATE_IS_INSECURE = 0x00000004 [inherited]

State Security Flags.

These flags describe the security state reported by a call to the onSecurityChange method. These flags are mutually exclusive.

STATE_IS_INSECURE This flag indicates that the data corresponding to the request was received over an insecure channel.

STATE_IS_BROKEN This flag indicates an unknown security state. This may mean that the request is being loaded as part of a page in which some content was received over an insecure channel.

STATE_IS_SECURE This flag indicates that the data corresponding to the request was received over a secure channel. The degree of security is expressed by STATE_SECURE_HIGH, STATE_SECURE_MED, or STATE_SECURE_LOW.

Definition at line 204 of file nsIWebProgressListener.idl.

const unsigned long nsIWebProgressListener::STATE_IS_NETWORK = 0x00040000 [inherited]

Definition at line 164 of file nsIWebProgressListener.idl.

const unsigned long nsIWebProgressListener::STATE_IS_REQUEST = 0x00010000 [inherited]

State Type Flags.

These flags further describe the entity for which the state transition is occuring. These flags are NOT mutually exclusive (i.e., an onStateChange event may indicate some combination of these flags).

STATE_IS_REQUEST This flag indicates that the state transition is for a request, which includes but is not limited to document requests. (See below for a description of document requests.) Other types of requests, such as requests for inline content (e.g., images and stylesheets) are considered normal requests.

STATE_IS_DOCUMENT This flag indicates that the state transition is for a document request. This flag is set in addition to STATE_IS_REQUEST. A document request supports the nsIChannel interface and its loadFlags attribute includes the nsIChannel::LOAD_DOCUMENT_URI flag.

A document request does not complete until all requests associated with the loading of its corresponding document have completed. This includes other document requests (e.g., corresponding to HTML <iframe> elements). The document corresponding to a document request is available via the DOMWindow attribute of onStateChange's aWebProgress parameter.

STATE_IS_NETWORK This flag indicates that the state transition corresponds to the start or stop of activity in the indicated nsIWebProgress instance. This flag is accompanied by either STATE_START or STATE_STOP, and it may be combined with other State Type Flags.

Unlike STATE_IS_WINDOW, this flag is only set when activity within the nsIWebProgress instance being observed starts or stops. If activity only occurs in a child nsIWebProgress instance, then this flag will be set to indicate the start and stop of that activity.

For example, in the case of navigation within a single frame of a HTML frameset, a nsIWebProgressListener instance attached to the nsIWebProgress of the frameset window will receive onStateChange calls with the STATE_IS_NETWORK flag set to indicate the start and stop of said navigation. In other words, an observer of an outer window can determine when activity, that may be constrained to a child window or set of child windows, starts and stops.

STATE_IS_WINDOW This flag indicates that the state transition corresponds to the start or stop of activity in the indicated nsIWebProgress instance. This flag is accompanied by either STATE_START or STATE_STOP, and it may be combined with other State Type Flags.

This flag is similar to STATE_IS_DOCUMENT. However, when a document request completes, two onStateChange calls with STATE_STOP are generated. The document request is passed as aRequest to both calls. The first has STATE_IS_REQUEST and STATE_IS_DOCUMENT set, and the second has the STATE_IS_WINDOW flag set (and possibly the STATE_IS_NETWORK flag set as well -- see above for a description of when the STATE_IS_NETWORK flag may be set). This second STATE_STOP event may be useful as a way to partition the work that occurs when a document request completes.

Definition at line 162 of file nsIWebProgressListener.idl.

const unsigned long nsIWebProgressListener::STATE_IS_SECURE = 0x00000002 [inherited]

Definition at line 206 of file nsIWebProgressListener.idl.

const unsigned long nsIWebProgressListener::STATE_IS_WINDOW = 0x00080000 [inherited]

Definition at line 165 of file nsIWebProgressListener.idl.

const unsigned long nsIWebProgressListener::STATE_NEGOTIATING = 0x00000008 [inherited]

Definition at line 98 of file nsIWebProgressListener.idl.

const unsigned long nsIWebProgressListener::STATE_REDIRECTING = 0x00000002 [inherited]

Definition at line 96 of file nsIWebProgressListener.idl.

const unsigned long nsIWebProgressListener::STATE_RESTORING = 0x01000000 [inherited]

State Modifier Flags.

These flags further describe the transition which is occuring. These flags are NOT mutually exclusive (i.e., an onStateChange event may indicate some combination of these flags).

STATE_RESTORING This flag indicates that the state transition corresponds to the start or stop of activity for restoring a previously-rendered presentation. As such, there is no actual network activity associated with this request, and any modifications made to the document or presentation when it was originally loaded will still be present.

Definition at line 182 of file nsIWebProgressListener.idl.

const unsigned long nsIWebProgressListener::STATE_SECURE_HIGH = 0x00040000 [inherited]

Security Strength Flags.

These flags describe the security strength and accompany STATE_IS_SECURE in a call to the onSecurityChange method. These flags are mutually exclusive.

These flags are not meant to provide a precise description of data transfer security. These are instead intended as a rough indicator that may be used to, for example, color code a security indicator or otherwise provide basic data transfer security feedback to the user.

STATE_SECURE_HIGH This flag indicates a high degree of security.

STATE_SECURE_MED This flag indicates a medium degree of security.

STATE_SECURE_LOW This flag indicates a low degree of security.

Definition at line 229 of file nsIWebProgressListener.idl.

const unsigned long nsIWebProgressListener::STATE_SECURE_LOW = 0x00020000 [inherited]

Definition at line 231 of file nsIWebProgressListener.idl.

const unsigned long nsIWebProgressListener::STATE_SECURE_MED = 0x00010000 [inherited]

Definition at line 230 of file nsIWebProgressListener.idl.

const unsigned long nsIWebProgressListener::STATE_START = 0x00000001 [inherited]

State Transition Flags.

These flags indicate the various states that requests may transition through as they are being loaded. These flags are mutually exclusive.

For any given request, onStateChange is called once with the STATE_START flag, zero or more times with the STATE_TRANSFERRING flag or once with the STATE_REDIRECTING flag, and then finally once with the STATE_STOP flag. NOTE: For document requests, a second STATE_STOP is generated (see the description of STATE_IS_WINDOW for more details).

STATE_START This flag indicates the start of a request. This flag is set when a request is initiated. The request is complete when onStateChange is called for the same request with the STATE_STOP flag set.

STATE_REDIRECTING This flag indicates that a request is being redirected. The request passed to onStateChange is the request that is being redirected. When a redirect occurs, a new request is generated automatically to process the new request. Expect a corresponding STATE_START event for the new request, and a STATE_STOP for the redirected request.

STATE_TRANSFERRING This flag indicates that data for a request is being transferred to an end consumer. This flag indicates that the request has been targeted, and that the user may start seeing content corresponding to the request.

STATE_NEGOTIATING This flag is not used.

STATE_STOP This flag indicates the completion of a request. The aStatus parameter to onStateChange indicates the final status of the request.

Definition at line 95 of file nsIWebProgressListener.idl.

const unsigned long nsIWebProgressListener::STATE_STOP = 0x00000010 [inherited]

Definition at line 99 of file nsIWebProgressListener.idl.

const unsigned long nsIWebProgressListener::STATE_TRANSFERRING = 0x00000004 [inherited]

Definition at line 97 of file nsIWebProgressListener.idl.


The documentation for this class was generated from the following files: