| OZ++ Sample: FileAccessWatcher |
/****************************************************************************** * * Copyright (c) 2015 Antillia.com TOSHIYUKI ARAI. ALL RIGHTS RESERVED. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions, and the following disclaimer. * * 2. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * * NonblockingFileAccessWatcher.cpp * *****************************************************************************/ #include <oz++/motif/ApplicationView.h> #include <oz++/motif/ScrolledListBox.h> #include <oz++/motif/CompoundString.h> #include <oz++/motif/RenderTable.h> #include <oz++/FileAccessWatcher.h> #include <oz++/Logger.h> namespace OZ { class MainView :public ApplicationView { private: //Inner class starts. class MotifFileAccessEventMetaData :public FileAccessEventMetaData { private: static const int MAX_LISTITEM = 1000; ListBox* listBox; //Shallow copy public: MotifFileAccessEventMetaData(ListBox* list, int fd) :FileAccessEventMetaData(fd), listBox(list) { } virtual void display(const char* item) { int count = listBox -> getItemCount(); if (count > MAX_LISTITEM) { listBox -> deletePos(count); } CompoundString cs(item); listBox -> addFirstUnselected(cs); listBox -> flush(); } }; class MotifFileAccessWatcher :public FileAccessWatcher { private: ListBox* listBox; //Shallow copy public: MotifFileAccessWatcher(const char* mount, ListBox* list) :FileAccessWatcher(mount), listBox(list) { } virtual void run() { int notifierFD = getNotifierFD(); const nfds_t NFDS = 1; struct pollfd fds[NFDS]; fds[0].fd = notifierFD; fds[0].events = POLLIN; while (looping) { sleepMilliSec(sleepmsec); int poll_num = poll(fds, NFDS, -1); if (poll_num == -1) { perror("poll"); break; } if (poll_num > 0 && fds[0].revents & POLLIN) { try { MotifFileAccessEventMetaData metaData(listBox, notifierFD); metaData.parse(index); //index++; } catch (Exception& ex) { caught(ex); } } } //while } }; //Inner class ends. SmartPtr<RenderTable> rtable; SmartPtr<ScrolledListBox> sclist; SmartPtr<MotifFileAccessWatcher> accessWatcher; public: MainView(Application& applet, const char* name, Args& args, const char* mount) :ApplicationView(applet, name, args) { Args ar; ar.set(XmNscrollBarDisplayPolicy, XmVARIABLE); ar.set(XmNlistSizePolicy, XmCONSTANT); ar.set(XmNvisibleItemCount, 30); sclist = new ScrolledListBox(this, "list", ar); ListBox* listBox = sclist -> getList(); // Create an instance of RenderTable based on a Rendition object. ar.reset(); ar.set(XmNfontSize, 12); ar.set(XmNfontName, "Courier"); rtable = new RenderTable(listBox, "", ar); // Set the renderTable to the ListBox instance. listBox -> set(XmNrenderTable, rtable); printf("Watch mount %s\n", mount); accessWatcher = new MotifFileAccessWatcher(mount, listBox); accessWatcher -> setSleepMilliSec(500); accessWatcher -> start(); } ~MainView() { } }; } // You can specify pathnames to watch on the command line, as shown below: // InodeWatcher /etc /tmp int main(int argc, char** argv) { sigignore(SIGPIPE); const char* mount = "/"; if (argc == 2) { mount = argv[1]; } else if (argc > 2) { printf("Usage: %s mout\n", argv[0]); return 1; } XInitThreads(); try { const char* appclass = "FileAccessWatcher"; Application applet(appclass, argc, argv); Args args; args.set(XmNgeometry, "600x400"); MainView view(applet, argv[0], args, mount); view.realize(); applet.run(); } catch (Exception& ex) { caught(ex); } return 0; }