/** This method is called from within the constructor to initialize the form. */
public void initComponents() {
/** **************** The components ********************************* */
firstPanel = new JPanel();
firstPanel.setBorder(BorderFactory.createEmptyBorder(10, 5, 5, 2));
// If put to False: we see the container's background
firstPanel.setOpaque(false);
// rows, columns, horizontalGap, verticalGap
firstPanel.setLayout(new GridLayout(4, 2, 3, 3));
this.setLayout(new GridLayout(2, 1, 3, 3));
this.add(firstPanel);
proxyStackNameLabel = new JLabel("Proxy stack name:");
proxyStackNameLabel.setToolTipText("The name of the stack to set");
// Alignment of the text
proxyStackNameLabel.setHorizontalAlignment(AbstractButton.CENTER);
// Color of the text
proxyStackNameLabel.setForeground(Color.black);
// Size of the text
proxyStackNameLabel.setFont(new Font("Dialog", 1, 12));
// If put to true: we see the label's background
proxyStackNameLabel.setOpaque(true);
proxyStackNameLabel.setBackground(ProxyLauncher.labelBackGroundColor);
proxyStackNameLabel.setBorder(ProxyLauncher.labelBorder);
proxyStackNameTextField = new JTextField(20);
proxyStackNameTextField.setHorizontalAlignment(AbstractButton.CENTER);
proxyStackNameTextField.setFont(new Font("Dialog", 0, 14));
proxyStackNameTextField.setBackground(ProxyLauncher.textBackGroundColor);
proxyStackNameTextField.setForeground(Color.black);
proxyStackNameTextField.setBorder(BorderFactory.createLoweredBevelBorder());
firstPanel.add(proxyStackNameLabel);
firstPanel.add(proxyStackNameTextField);
proxyIPAddressLabel = new JLabel("Proxy IP address:");
proxyIPAddressLabel.setToolTipText("The address of the proxy to set");
// Alignment of the text
proxyIPAddressLabel.setHorizontalAlignment(AbstractButton.CENTER);
// Color of the text
proxyIPAddressLabel.setForeground(Color.black);
// Size of the text
proxyIPAddressLabel.setFont(new Font("Dialog", 1, 12));
// If put to true: we see the label's background
proxyIPAddressLabel.setOpaque(true);
proxyIPAddressLabel.setBackground(ProxyLauncher.labelBackGroundColor);
proxyIPAddressLabel.setBorder(ProxyLauncher.labelBorder);
proxyIPAddressTextField = new JTextField(20);
proxyIPAddressTextField.setHorizontalAlignment(AbstractButton.CENTER);
proxyIPAddressTextField.setFont(new Font("Dialog", 0, 14));
proxyIPAddressTextField.setBackground(ProxyLauncher.textBackGroundColor);
proxyIPAddressTextField.setForeground(Color.black);
proxyIPAddressTextField.setBorder(BorderFactory.createLoweredBevelBorder());
firstPanel.add(proxyIPAddressLabel);
firstPanel.add(proxyIPAddressTextField);
outboundProxyLabel = new JLabel("Next hop (IP:port/protocol):");
outboundProxyLabel.setToolTipText(
"Location where the message will be sent "
+ "if all the resolutions (DNS, router,...) fail. If not set: 404 will be replied");
// Alignment of the text
outboundProxyLabel.setHorizontalAlignment(AbstractButton.CENTER);
// Color of the text
outboundProxyLabel.setForeground(Color.black);
// Size of the text
outboundProxyLabel.setFont(new Font("Dialog", 1, 12));
// If put to true: we see the label's background
outboundProxyLabel.setOpaque(true);
outboundProxyLabel.setBackground(ProxyLauncher.labelBackGroundColor);
outboundProxyLabel.setBorder(ProxyLauncher.labelBorder);
outboundProxyTextField = new JTextField(20);
outboundProxyTextField.setHorizontalAlignment(AbstractButton.CENTER);
outboundProxyTextField.setFont(new Font("Dialog", 0, 14));
outboundProxyTextField.setBackground(ProxyLauncher.textBackGroundColor);
outboundProxyTextField.setForeground(Color.black);
outboundProxyTextField.setBorder(BorderFactory.createLoweredBevelBorder());
firstPanel.add(outboundProxyLabel);
firstPanel.add(outboundProxyTextField);
routerClassLabel = new JLabel("The Router class name:");
routerClassLabel.setToolTipText(
"The class name (full java package name) of the router" + " used to forward the messages");
// Alignment of the text
routerClassLabel.setHorizontalAlignment(AbstractButton.CENTER);
// Color of the text
routerClassLabel.setForeground(Color.black);
// Size of the text
routerClassLabel.setFont(new Font("Dialog", 1, 12));
// If put to true: we see the label's background
routerClassLabel.setOpaque(true);
routerClassLabel.setBackground(ProxyLauncher.labelBackGroundColor);
routerClassLabel.setBorder(ProxyLauncher.labelBorder);
routerClassTextField = new JTextField(20);
routerClassTextField.setHorizontalAlignment(AbstractButton.CENTER);
routerClassTextField.setFont(new Font("Dialog", 0, 12));
routerClassTextField.setBackground(ProxyLauncher.textBackGroundColor);
routerClassTextField.setForeground(Color.black);
routerClassTextField.setBorder(BorderFactory.createLoweredBevelBorder());
firstPanel.add(routerClassLabel);
firstPanel.add(routerClassTextField);
JPanel panel = new JPanel();
// top, left, bottom, right
panel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 2));
// If put to False: we see the container's background
panel.setOpaque(false);
// rows, columns, horizontalGap, verticalGap
panel.setLayout(new BorderLayout());
this.add(panel);
JLabel lpLabel = new JLabel("Listening points list:");
lpLabel.setVisible(true);
lpLabel.setToolTipText("The listening points of the proxy");
lpLabel.setHorizontalAlignment(AbstractButton.CENTER);
lpLabel.setForeground(Color.black);
lpLabel.setFont(new Font("Dialog", 1, 12));
lpLabel.setOpaque(true);
lpLabel.setBackground(ProxyLauncher.labelBackGroundColor);
lpLabel.setBorder(ProxyLauncher.labelBorder);
panel.add(lpLabel, BorderLayout.NORTH);
// this.add(listeningPointsList);
JScrollPane scrollPane =
new JScrollPane(
listeningPointsList,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
panel.add(scrollPane, BorderLayout.CENTER);
thirdPanel = new JPanel();
thirdPanel.setOpaque(false);
// top, left, bottom, right
thirdPanel.setBorder(BorderFactory.createEmptyBorder(3, 0, 5, 0));
thirdPanel.setLayout(new GridLayout(1, 2, 3, 3));
JButton addLPButton = new JButton(" Add ");
addLPButton.setToolTipText("Add a listening point");
addLPButton.setFocusPainted(false);
addLPButton.setFont(new Font("Dialog", 1, 16));
addLPButton.setBackground(ProxyLauncher.buttonBackGroundColor);
addLPButton.setBorder(ProxyLauncher.buttonBorder);
addLPButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent evt) {
addLPButtonActionPerformed(evt);
}
});
thirdPanel.add(addLPButton);
JButton removeLPButton = new JButton(" Remove ");
removeLPButton.setToolTipText("Remove a listening point");
removeLPButton.setFocusPainted(false);
removeLPButton.setFont(new Font("Dialog", 1, 16));
removeLPButton.setBackground(ProxyLauncher.buttonBackGroundColor);
removeLPButton.setBorder(ProxyLauncher.buttonBorder);
removeLPButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent evt) {
removeLPButtonActionPerformed(evt);
}
});
thirdPanel.add(removeLPButton);
panel.add(thirdPanel, BorderLayout.SOUTH);
}
public void unblockProperties() {
outboundProxyAddressTextField.setEditable(true);
outboundProxyAddressTextField.setBackground(Color.white);
outboundProxyPortTextField.setEditable(true);
outboundProxyPortTextField.setBackground(Color.white);
registrarAddressTextField.setEditable(true);
registrarAddressTextField.setBackground(Color.white);
registrarPortTextField.setEditable(true);
registrarPortTextField.setBackground(Color.white);
imAddressTextField.setEditable(true);
imAddressTextField.setBackground(Color.white);
imPortTextField.setEditable(true);
imPortTextField.setBackground(Color.white);
imProtocolTextField.setEditable(true);
imProtocolTextField.setBackground(Color.white);
outputFileTextField.setEditable(true);
outputFileTextField.setBackground(Color.white);
buddiesFileTextField.setEditable(true);
buddiesFileTextField.setBackground(Color.white);
authenticationFileTextField.setEditable(true);
authenticationFileTextField.setBackground(Color.white);
defaultRouterTextField.setEditable(true);
defaultRouterTextField.setBackground(Color.white);
}
/** initialize GUI components */
private JPanel initComponents() {
JPanel panel = new JPanel();
JScrollPane jScrollPane1 = new JScrollPane();
JLabel jLabel1 = new JLabel();
JLabel jLabel2 = new JLabel();
jScrollPane1.setViewportView(jEditorPaneAbout);
jButtonOk.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
jButtonOkActionPerformed(e);
}
});
jButtonOk.setText("OK");
jLabel1.setText("Application:");
jLabel2.setText("Version:");
jTextFieldApplication.setBackground(new Color(255, 255, 255));
jTextFieldApplication.setEditable(false);
jTextFieldApplication.setBorder(BorderFactory.createBevelBorder(BevelBorder.RAISED));
jTextFieldVersion.setBackground(new Color(255, 255, 255));
jTextFieldVersion.setEditable(false);
jTextFieldVersion.setBorder(BorderFactory.createBevelBorder(BevelBorder.RAISED));
jEditorPaneAbout.setEditable(false);
org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(panel);
panel.setLayout(layout);
layout.setHorizontalGroup(
layout
.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(
layout
.createSequentialGroup()
.add(
layout
.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(
layout
.createSequentialGroup()
.addContainerGap()
.add(
layout
.createParallelGroup(
org.jdesktop.layout.GroupLayout.LEADING)
.add(
jScrollPane1,
org.jdesktop.layout.GroupLayout.DEFAULT_SIZE,
289,
Short.MAX_VALUE)
.add(
layout
.createSequentialGroup()
.add(
layout
.createParallelGroup(
org.jdesktop.layout.GroupLayout
.LEADING)
.add(
jTextFieldApplication,
org.jdesktop.layout.GroupLayout
.PREFERRED_SIZE,
145,
org.jdesktop.layout.GroupLayout
.PREFERRED_SIZE)
.add(jLabel1))
.add(4, 4, 4)
.add(
layout
.createParallelGroup(
org.jdesktop.layout.GroupLayout
.LEADING)
.add(jLabel2)
.add(
jTextFieldVersion,
org.jdesktop.layout.GroupLayout
.DEFAULT_SIZE,
140,
Short.MAX_VALUE)))))
.add(
layout
.createSequentialGroup()
.add(106, 106, 106)
.add(
jButtonOk,
org.jdesktop.layout.GroupLayout.DEFAULT_SIZE,
101,
Short.MAX_VALUE)
.add(94, 94, 94)))
.addContainerGap()));
layout.setVerticalGroup(
layout
.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(
layout
.createSequentialGroup()
.addContainerGap()
.add(
layout
.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
.add(jLabel1)
.add(jLabel2))
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(
layout
.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
.add(
jTextFieldApplication,
org.jdesktop.layout.GroupLayout.PREFERRED_SIZE,
org.jdesktop.layout.GroupLayout.DEFAULT_SIZE,
org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.add(
jTextFieldVersion,
org.jdesktop.layout.GroupLayout.PREFERRED_SIZE,
org.jdesktop.layout.GroupLayout.DEFAULT_SIZE,
org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(
jScrollPane1,
org.jdesktop.layout.GroupLayout.DEFAULT_SIZE,
300,
Short.MAX_VALUE)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(jButtonOk)
.addContainerGap()));
return panel;
}
// FUNCTION TO SIMULATE A STEP IN THE SIMULATION ON THE FRAME
public void step() {
/**
* EACH TIME THE NEXT BUTTON IS PRESSED, ALL THE STATES THAT OCURRED UPTO THE CURRENT STATE ARE
* EVALUATED. THERE IS A while STATEMENT THAT PERFORMS THIS FUNCTION AND CONTAINS A switch
* STATEMENT WITHIN IT TO EVALUATE EACH STEP AS IT OCCURS.
*/
////////////////////// INITIALIZATION ///////////////////////////////////////
// UPDATE THE STATE OF THE CACHE AND MEMORY
for (int i = 0; i < 16; i++) {
cachePanel.stringBlocks[i] = "";
cachePanel.boolBlocks[i] = false;
cachePanel.tag[i] = "";
cachePanel.boolTags[i] = false;
statusCacheEmpty[i] = true;
statusCacheLRU[i] = 0;
}
for (int i = 0; i < 8; i++) {
cachePanel.boolWords[i] = false;
memoryPanel.boolWords[i] = false;
}
for (int i = 0; i < 32; i++) memoryPanel.boolBlocks[i] = false;
// UPDATE THE BITS IN MAIN MEMORY ADDRESS
tTag.setText("");
tWord.setText("");
tTag.setBackground(new Color(205, 205, 205));
tWord.setBackground(new Color(205, 205, 205));
// UPDATE THE CACHE HITS AND MISSES FIELDS
cacheHits = 0;
cacheMisses = 0;
tCacheHits.setText(" 0");
tCacheMisses.setText(" 0");
// UPDATE THE VALUES USED FOR BRINGING MEMORY BLOCKS IN CACHE
statusLRU = 0;
memInCache = -1;
lruCacheBlock = -1;
// RESET THE VALUE OF addSel
evaluateIndex = 0;
// DISABLE ADDRESS GENERATION BUTTONS
autoGen.setEnabled(false);
selfGen.setEnabled(false);
////////////////////// END INITIALIZATION /////////////////////////////////////
// IF Next WAS CLICKED, INCREMENT moveStatus
if (nextClicked) moveStatus++;
else {
// DECREMENT moveStatus AND ENABLE NEXT SINCE IT MIGHT BE DISABLED
moveStatus--;
next.setEnabled(true);
}
// IF NO MORE back MOVES CAN BE MADE, DISABLE back BUTTON
if (moveStatus == 0) {
back.setEnabled(false);
tProgress.setText(
"You cannot go back any further."
+ "\nPlease click on \"Next\" or \"Restart\" to continue.");
tProgress.setCaretPosition(0);
// CLEAR THE SELECTED ADDRESS REFERENCE STRING
addRefStrList.clearSelection();
} else
// ENABLE back BUTTON ONCE THE FIRST MOVE IS MADE
back.setEnabled(true);
// INITIALIZE THE VARIABLE THAT KEEPS TRACK OF THE STATE WE ARE CURRENTLY EVALUATING.
int tempState = 1;
// CONTINUE TO EVALUATE EACH STATE TILL WE REACH THE CURRENT STATE
while (tempState <= moveStatus) {
switch (tempState % 6) {
case 1: // IF A NEW CYCLE IS BEGINNING, OBTAIN NEXT ADDRESS REFERENCE
// OBTAIN THE ADDRESS REFERENCE STRING
addRefStrList.setSelectedIndex(evaluateIndex);
// ENSURE THAT THE LIST SCROLLS AND SELECTED INDEX IS VISIBLE
// DUE TO REPAINTING CONSTRAINTS, ONLY DO THIS IN THE CURRENT STATE
if (tempState == moveStatus) addRefStrList.ensureIndexIsVisible(evaluateIndex);
// EVALUATE THE TAG, BLOCK AND WORD
hexAddress = (String) addRefStrList.getSelectedValue();
int intAddress = Integer.parseInt(hexAddress, 16);
binAddress = Integer.toBinaryString(intAddress);
// USING CLASS INTEGER'S parseInt FUNCTION RETURNS A BINARY STRING WITHOUT LEADING 0'S
// ENSURE THAT binAddress is 8 bits
if (binAddress.length() < 8) {
int zeroes = 8 - binAddress.length();
for (int i = 0; i < zeroes; i++) binAddress = '0' + binAddress;
}
tag = binAddress.substring(0, 5);
word = binAddress.substring(5);
// CALCULATE THE ACTUAL CACHE AND MEMORY BLOCKS AND WORDS IN QUESTION
intWordDec = Integer.parseInt(word, 2);
intBlockDecMem = Integer.parseInt(tag, 2);
// IF THIS IS THE CURRENT STATE, UPDATE THE PROGRESS FIELD
if (tempState == moveStatus) {
tProgress.setText(
"The memory address we want is obtained from the Address Reference String."
+ "\nIt is (in hexadecimal): "
+ hexAddress
+ ".");
tProgress.setCaretPosition(0);
}
break;
case 2: // EVALUATE THE BITS IN MAIN MEMORY ADDRESS AND HIGHLIGHT THEM
// IF THIS IS THE CURRENT STATE, UPDATE THE PROGRESS FIELD
if (tempState == moveStatus) {
tProgress.setText(
"The hexadecimal address "
+ hexAddress
+ " evaluates to its binary equivalent "
+ binAddress
+ "."
+ "\nHence the bits in the Main Memory Address are divided into the following fields\n"
+ tag
+ " --> Tag, "
+ word
+ " --> Word."
+ "\nThe tag bits identify the memory block, "
+ "and the word bits identify the word within the block.");
tProgress.setCaretPosition(0);
// HIGHLIGHT THE BITS IN MAIN MEMORY ADDRESS IN GREEN
tTag.setBackground(Color.green);
tWord.setBackground(Color.green);
}
tTag.setText(" " + tag);
tWord.setText(" " + word);
break;
case 3: // FIND THE CACHE BLOCK IN QUESTION AND HIGHLIGHT IT
// UNDO HIGHLIGHTS OF PREVIOUS STEP
tTag.setBackground(new Color(205, 205, 205));
tWord.setBackground(new Color(205, 205, 205));
// IF THIS IS THE CURRENT STATE, UPDATE THE PROGRESS FIELD
if (tempState == moveStatus) {
tProgress.setText(
"Every time a memory block is placed in cache, its tag field is stored with it as well."
+ "\nSo, to find the required memory block in cache, its tag, "
+ tag
+ " is compared to all the valid tag fields in cache.");
tProgress.setCaretPosition(0);
}
// GET THE BLOCK IN CACHE WHERE MEMORY BLOCK EXISTS, IF AT ALL
memInCache = getCacheBlock(tag);
// IF MEMORY BLOCK IS NOT IN CACHE...
if (memInCache == -1) {
if (tempState == moveStatus) {
tProgress.append(
"\n\nSince the memory block is not in cache, there is a cache miss."
+ "\nSo the block needs to be brought in from memory.");
tProgress.setCaretPosition(0);
}
// GET FIRST EMPTY CACHE BLOCK, IF AVAILABLE
emptyCacheBlock = getFirstEmptyCacheBlock();
// IF EMPTY CACHE BLOCK IS AVAILABLE, THIS IS WHERE THE MEMORY WILL BE BROUGHT SO
// DISPLAY IT
if (!(emptyCacheBlock == -1)) {
// IF THIS IS THE CURRENT STATE, UPDATE THE PROGRESS FIELD
if (tempState == moveStatus) {
tProgress.append(
"\nSince the cache has empty space, the first available block will be filled."
+ "\nSee the highlighted cache block.");
tProgress.setCaretPosition(0);
}
// HIGHLIGHT THE CACHE BLOCK IN YELLOW
cachePanel.boolBlocks[emptyCacheBlock] = true;
cachePanel.boolTags[emptyCacheBlock] = true;
// STORE THE CHANGED CACHE BLOCK INDEX IN COMMON VARIABLE
intBlockDec = emptyCacheBlock;
}
// ELSE DISPLAY THE LRU CACHE BLOCK WHICH WILL BE REPLACED
else {
// IF THIS IS THE CURRENT STATE, UPDATE THE PROGRESS FIELD
if (tempState == moveStatus) {
tProgress.append(
"\nSince the cache is full, the least recently used cache block will be replaced."
+ "\nSee the highlighted cache block.");
tProgress.setCaretPosition(0);
}
lruCacheBlock = getLRUCacheBlock();
// HIGHLIGHT THE CACHE BLOCK IN YELLOW
cachePanel.boolBlocks[lruCacheBlock] = true;
cachePanel.boolTags[lruCacheBlock] = true;
// STORE THE CHANGED CACHE BLOCK INDEX IN COMMON VARIABLE
intBlockDec = lruCacheBlock;
}
// UPDATE COUNT OF CACHE MISSES
cacheMisses++;
tCacheMisses.setText(" " + cacheMisses);
} else {
if (tempState == moveStatus) {
tProgress.append(
"\n\nSince the required memory block is in cache block "
+ memInCache
+ " there is a cache hit.");
tProgress.setCaretPosition(0);
}
// HIGHLIGHT THE CACHE BLOCK IN YELLOW
// TO CAUSE HIGHLIGHTING ON THE CACHE, WE NEED TO MODIFY IT'S STATE, i.e. IT'S DATA
// MEMBERS
cachePanel.boolBlocks[memInCache] = true;
cachePanel.boolWords[intWordDec] = true;
cachePanel.boolTags[memInCache] = true;
// STORE THE CHANGED CACHE BLOCK INDEX IN COMMON VARIABLE
intBlockDec = memInCache;
// UPDATE COUNT OF CACHE HITS
cacheHits++;
tCacheHits.setText(" " + cacheHits);
}
break;
case 4: // EVALUATE THE MEMORY BLOCK IN QUESTION AND HIGHLIGHT IT
// UNDO THE HIGHLIGHTS OF THE PREVIOUS STEP
cachePanel.boolBlocks[intBlockDec] = false;
cachePanel.boolWords[intWordDec] = false;
cachePanel.boolTags[intBlockDec] = false;
// IF THIS IS THE CURRENT STATE, UPDATE THE PROGRESS FIELD
if (tempState == moveStatus) {
tProgress.setText(
"Highlighted is the memory block in question. Since the tag bits are "
+ tag
+ ", the memory block, in decimal, is "
+ intBlockDecMem
+ ".");
tProgress.setCaretPosition(0);
}
// SET THE MEMORY STATE SO AS TO HIGHLIGHT THE REQUIRED MEMORY BLOCK
memoryPanel.boolBlocks[intBlockDecMem] = true;
// SET THE MEMORY STATE SO AS TO HIGHLIGHT THE REQUIRED WORD
memoryPanel.boolWords[intWordDec] = true;
break;
case 5: // HIGHLIGHT THE CACHE BLOCK WITH THE MEMORY BLOCK NOW IN IT
// UNDO HIGHLIGHTS OF PREVIOUS STEP
memoryPanel.boolBlocks[intBlockDecMem] = false;
memoryPanel.boolWords[intWordDec] = false;
/*
* NOW, THERE ARE 3 WAYS TO GO FROM HERE
* 1. IF THERE IS AN EMPTY CACHE BLOCK, SIMPLY BRING THE MEMORY BLOCK INTO CACHE
* 2. IF THE REQUIRED MEMORY BLOCK IS ALREADY IN CACHE, DO NOTHING
* 3. IF THE CACHE IS FULL, FIND THE LRU BLOCK AND REPLACE IT WITH THE REQUIRED MEMORY BLOCK
*/
// IF THE MEMORY BLOCK WAS NOT IN CACHE AND AN EMPTY CACHE BLOCK IS AVAILABLE
// BRING THE MEMORY BLOCK AND TAG INTO CACHE AND HIGHLIGHT CACHE BLOCK
if ((memInCache == -1) && !(emptyCacheBlock == -1)) {
// IF THIS IS THE CURRENT STATE, UPDATE THE PROGRESS FIELD
if (tempState == moveStatus) {
tProgress.setText(
"As we saw earlier, the required memory block was not in cache."
+ "\nSince there was empty space in cache, we brought the memory block into it."
+ "\nWe also stored the tag, "
+ tag
+ ", of the memory block with the cache block."
+ "\n\nRemember that the memory block could be brought into any empty cache block."
+ "\nIn our example, we are using the first available empty block.");
tProgress.setCaretPosition(0);
}
// UPDATE THE COUNTER FOR THE LRU CACHE BLOCK
statusLRU++;
statusCacheLRU[emptyCacheBlock] = statusLRU;
statusCacheEmpty[emptyCacheBlock] = false;
// UPDATE THE CACHE ARRAYS KEEPING TRACK OF MEMORY BLOCKS AND TAGS
cachePanel.stringBlocks[emptyCacheBlock] = "" + intBlockDecMem;
cachePanel.tag[emptyCacheBlock] = tag;
// HIGHLIGHT THE CACHE BLOCK IN YELLOW
cachePanel.boolBlocks[emptyCacheBlock] = true;
cachePanel.boolWords[intWordDec] = true;
cachePanel.boolTags[emptyCacheBlock] = true;
// STORE THE CHANGED CACHE BLOCK INDEX IN COMMON VARIABLE
intBlockDec = emptyCacheBlock;
} // END IF
// IF MEMORY BLOCK IS ALREADY IN CACHE THEN JUST HIGHLIGHT THE CACHE BLOCK
else if ((memInCache >= 0) && (memInCache < 16)) {
// IF THIS IS THE CURRENT STATE, UPDATE THE PROGRESS FIELD
if (tempState == moveStatus) {
tProgress.setText(
"As we saw earlier, the required memory block is already in cache.");
tProgress.setCaretPosition(0);
}
// UPDATE THE COUNTER FOR THE LRU CACHE BLOCK
statusLRU++;
statusCacheLRU[memInCache] = statusLRU;
// HIGHLIGHT THE CACHE BLOCK IN YELLOW
cachePanel.boolBlocks[memInCache] = true;
cachePanel.boolWords[intWordDec] = true;
cachePanel.boolTags[memInCache] = true;
// STORE THE CHANGED CACHE BLOCK INDEX IN COMMON VARIABLE
intBlockDec = memInCache;
} // END ELSE IF
// IF THE MEMORY BLOCK IS NOT IN CACHE AND THE CACHE IS FULL
// FIND THE LRU CACHE BLOCK AND REPLACE IT WITH THE MEMORY BLOCK, THEN HIGHLIGHT THE CACHE
// BLOCK
else {
// FIND THE LRU CACHE BLOCK
lruCacheBlock = getLRUCacheBlock();
// IF THIS IS THE CURRENT STATE, UPDATE THE PROGRESS FIELD
if (tempState == moveStatus) {
tProgress.setText(
"As we saw earlier, the cache is full."
+ "\nSo we picked the least recently used cache block, "
+ lruCacheBlock
+ ", and replaced it with the required memory block.");
tProgress.setCaretPosition(0);
}
// UPDATE THE COUNTER FOR THE LRU CACHE BLOCK
statusLRU++;
statusCacheLRU[lruCacheBlock] = statusLRU;
statusCacheEmpty[lruCacheBlock] = false; // redundant stmt
// UPDATE THE CACHE ARRAYS KEEPING TRACK OF MEMORY BLOCKS AND TAGS
cachePanel.stringBlocks[lruCacheBlock] = "" + intBlockDecMem;
cachePanel.tag[lruCacheBlock] = tag;
// HIGHLIGHT THE CACHE BLOCK IN YELLOW
cachePanel.boolBlocks[lruCacheBlock] = true;
cachePanel.boolWords[intWordDec] = true;
cachePanel.boolTags[lruCacheBlock] = true;
// STORE THE CHANGED CACHE BLOCK INDEX IN COMMON VARIABLE
intBlockDec = lruCacheBlock;
} // END ELSE
break;
case 0: // LAST STEP IN CYCLE - CLEANUP STEP!
// UNDO HIGHLIGHTS OF PREVIOUS STEP
cachePanel.boolBlocks[intBlockDec] = false;
cachePanel.boolWords[intWordDec] = false;
cachePanel.boolTags[intBlockDec] = false;
tTag.setText("");
tWord.setText("");
tTag.setBackground(new Color(205, 205, 205));
tWord.setBackground(new Color(205, 205, 205));
// CLEAR THE SELECTED ADDRESS REFERENCE STRING
addRefStrList.clearSelection();
// INCREMENT THE INDEX SO AS TO POINT TO THE NEXT ADDRESS REFERENCE STRING
evaluateIndex++;
// IF THE LAST ADDRESS REFERENCE STRING HAS BEEN REACHED, DO THE APPROPRIATE
if (evaluateIndex == listData.size()) {
if (tempState == moveStatus) {
tProgress.setText(
"This completes the runthrough."
+ "\nPlease click on \"Restart\", generate the Address Reference String "
+ "OR click \"Quit\" to finish.");
tProgress.setCaretPosition(0);
}
next.setEnabled(false);
// ENABLE ADDRESS GENERATION BUTTONS
autoGen.setEnabled(true);
selfGen.setEnabled(true);
reStarted = false;
}
// ELSE AN ACCESS CYCLE HAS BEEN COMPLETED SO SHOW THE APPROPRIATE MESSAGE IN THE PROGRESS
// FIELD
else {
if (tempState == moveStatus) {
tProgress.setText("This completes an access cycle.");
tProgress.setCaretPosition(0);
}
// CLEAR THE SELECTION IN THE ADDRESS REFERENCE STRING
addRefStrList.clearSelection();
}
break;
default:
JOptionPane.showMessageDialog(null, "Uh Oh, there's a problem in switch-case!");
} // END switch
tempState++;
} // END while
// CALL THE REPAINT METHOD
repaint();
} // END FUNCTION step
/*
* FUNCTION TO RESTART THE APPLICATION
* BRINGS THE FRAME TO ITS ORIGINAL STARTING CONFIGURATION
*/
public void reStart() {
// UNDO THE HIGHLIGHTS, IF ANY, OF THE PREVIOUS STEPS
// UPDATE THE STATE OF THE CACHE AND MEMORY
for (int i = 0; i < 16; i++) {
cachePanel.stringBlocks[i] = "";
cachePanel.boolBlocks[i] = false;
cachePanel.tag[i] = "";
cachePanel.boolTags[i] = false;
statusCacheEmpty[i] = true;
statusCacheLRU[i] = 0;
}
for (int i = 0; i < 8; i++) {
cachePanel.boolWords[i] = false;
memoryPanel.boolWords[i] = false;
}
for (int i = 0; i < 32; i++) memoryPanel.boolBlocks[i] = false;
// UPDATE THE CACHE HITS AND MISSES FIELDS
cacheHits = 0;
cacheMisses = 0;
tCacheHits.setText(" 0");
tCacheMisses.setText(" 0");
// UPDATE THE VALUES USED FOR BRINGING MEMORY BLOCKS IN CACHE
statusLRU = 0;
memInCache = -1;
lruCacheBlock = -1;
// REFRESH THE ADDRESS REFERENCE STRING TO NULL
listData.removeAllElements();
addRefStrList.setListData(listData);
// UPDATE THE BITS IN MAIN MEMORY ADDRESS
tTag.setText("");
tWord.setText("");
tTag.setBackground(new Color(205, 205, 205));
tWord.setBackground(new Color(205, 205, 205));
// UPDATE THE PROGRESS FIELD
tProgress.setText(
"Let's start over. \nPlease generate the Address Reference String."
+ "\nThen click on \"Next\" to continue.");
// DISABLE THE NEXT AND BACK BUTTONS
next.setEnabled(false);
back.setEnabled(false);
// ENABLE ADDRESS GENERATION BUTTONS
autoGen.setEnabled(true);
selfGen.setEnabled(true);
// RESET THE VALUES OF moveStatus AND addSel AND reStarted
moveStatus = 0;
evaluateIndex = 0;
reStarted = true;
// CALL THE REPAINT METHOD
repaint();
} // END FUNCTION reStart
/** Initializes the graphical components */
public void init() {
username = getParameter("username");
if (username == null) {
username =
JOptionPane.showInputDialog(
this, "Please enter a username", "Login", JOptionPane.QUESTION_MESSAGE);
}
try {
PORT = Integer.valueOf(getParameter("port")).intValue();
} catch (NumberFormatException e) {
PORT = 42412;
}
URL url = getDocumentBase();
site = url.getHost();
locationURL = "http://" + site + ":" + url.getPort() + "/" + url.getPath();
setSize(615, 362);
c = getContentPane();
c.setBackground(new Color(224, 224, 224));
if (site == null || locationURL == null) {
c.add(new JLabel("ERROR: did not recieve needed data from page"));
}
myAction = new MyAction();
myKeyListener = new MyKeyListener();
myMouseListener = new MyMouseListener();
myHyperlinkListener = new MyHyperlinkListener();
c.setLayout(null);
cboChannels = new JComboBox();
cboChannels.setBounds(5, 5, 150, 24);
butChannel = new JButton("Join");
butChannel.setToolTipText("Join channel");
butChannel.addActionListener(myAction);
butChannel.setBounds(160, 5, 60, 24);
butCreate = new JButton("Create");
butCreate.setToolTipText("Create new channel");
butCreate.addActionListener(myAction);
butCreate.setBounds(230, 5, 100, 24);
butCreate.setEnabled(false);
butInvite = new JButton("Invite");
butInvite.setToolTipText("Invite Friend");
butInvite.addActionListener(myAction);
butInvite.setBounds(340, 5, 80, 24);
mainChat = new ChatPane(this);
textScroller =
new JScrollPane(
mainChat,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
textScroller.setBounds(5, 34, 500, 270);
userList = new JList();
userList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
userList.setCellRenderer(new MyCellRenderer());
userList.setBackground(new Color(249, 249, 250));
JScrollPane userScroller = new JScrollPane(userList);
userScroller.setBounds(510, 34, 100, 297);
messageText = new JTextField();
messageText.setBounds(5, 309, 500, 22);
messageText.setColumns(10);
messageText.setBackground(new Color(249, 249, 250));
JMenuItem item;
popup = new JPopupMenu("test");
popup.add("whisper").addActionListener(myAction);
popup.add("private message").addActionListener(myAction);
popup.add("ignore").addActionListener(myAction);
popup.add("clear ignore list").addActionListener(myAction);
conNo = new ImageIcon(getURL("images/connect_no.gif"));
conYes = new ImageIcon(getURL("images/connect_established.gif"));
secNo = new ImageIcon(getURL("images/decrypted.gif"));
secYes = new ImageIcon(getURL("images/encrypted.gif"));
conIcon = new JLabel(conNo);
conIcon.setBorder(new EtchedBorder());
secIcon = new JLabel(secNo);
secIcon.setBorder(new EtchedBorder());
conIcon.setBounds(563, 334, 22, 22);
secIcon.setBounds(588, 334, 22, 22);
bottomText =
new JLabel(
"<html><body><font color=#445577><b>"
+ "LlamaChat "
+ VERSION
+ "</b></font> © "
+ "<a href=\""
+ linkURL
+ "\">Joseph Monti</a> 2002-2003"
+ "</body></html>");
bottomText.setBounds(5, 336, 500, 20);
c.add(cboChannels);
c.add(butChannel);
c.add(butCreate);
c.add(butInvite);
c.add(textScroller);
c.add(userScroller);
c.add(messageText);
c.add(conIcon);
c.add(secIcon);
c.add(bottomText);
userList.addMouseListener(myMouseListener);
messageText.addKeyListener(myKeyListener);
bottomText.addMouseListener(myMouseListener);
users = new ArrayList();
ignores = new ArrayList(5);
afks = new ArrayList(5);
admins = new ArrayList(5);
history = new CommandHistory(10);
admin = false;
channels = new Hashtable();
privates = new PrivateMsg(this);
showUserStatus = false;
myColors[0] = new Color(200, 0, 0);
myColors[1] = new Color(0, 150, 0);
myColors[2] = new Color(0, 0, 200);
rect = new Rectangle(0, 0, 1, 1);
String opening =
"<font color=#333333>"
+ "==================================<br>"
+ "Welcome to LlamaChat "
+ VERSION
+ "<br>"
+ "If you need assistance, type \\help<br>"
+ "Enjoy your stay!<br>"
+ "Maestria Aplicada en Redes<br>"
+ "==================================<br></font>";
HTMLDocument doc = (HTMLDocument) mainChat.getDocument();
HTMLEditorKit kit = (HTMLEditorKit) mainChat.getEditorKit();
try {
kit.insertHTML(doc, doc.getLength(), opening, 0, 0, HTML.Tag.FONT);
} catch (Throwable t) {
t.printStackTrace(System.out);
}
// validate the name
if (!username.matches("[\\w_-]+?")) {
error(
"username contains invalid characters, changing to "
+ "'invalid' for now. "
+ "Type \\rename to chose a new name");
username = "******";
}
if (username.length() > 10) {
username = username.substring(0, 10);
error("username too long, changed to " + username);
}
connect();
}