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Adding comments and refactoring further

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This commit is contained in:
hitanshu310 2026-01-01 12:12:37 +05:30
parent 6428f54e14
commit d5d26c0445
1 changed files with 34 additions and 20 deletions
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50
src/main/java/com/hithomelabs/dsa/concurrency/DeadLockExampleWithLock.java
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@ -13,14 +13,22 @@ import java.util.concurrent.locks.ReentrantLock;
class Paper{
private static Lock lock = new ReentrantLock();
private String message;
public String procurePaper() {
boolean hasLock = false;
try{
if(lock.tryLock(500, TimeUnit.MILLISECONDS)){
hasLock = true;
// * * Inner try block if lock is acquired successfully
// * * To ensure the lock is always unlocked in the finally block
try{
return "writing on paper ...";
} catch (Exception e) {
throw e; // * * Inner catch block just throws the exception for outer block to handle
}
finally {
lock.unlock();
}
}
else{
return "Could not get lock";
@ -28,10 +36,6 @@ class Paper{
}catch (Exception e){
System.out.println(e.getMessage());
}
finally {
if (hasLock)
lock.unlock();
}
return "";
}
@ -39,16 +43,31 @@ class Paper{
class Pen{
private String message;
private static Lock lock = new ReentrantLock();
public String procurePen(){
boolean hasLock = false;
// * * Outer try block, required because a tryLock with timeout needs to handle interrupts
try{
if(lock.tryLock(500,TimeUnit.MILLISECONDS)){
hasLock = true;
Thread.sleep(5000);
// * * Inner try block if lock is acquired successfully
// * * to ensure the lock is always unlocked in the finally block
try {
// * * After gaining lock, thread sleeps
// * * Causing the other thread to timeOut waiting to procurePen
Thread.sleep(1000);
return "Writing with pen ...";
} catch (InterruptedException e) {
throw e;
}
finally {
lock.unlock();
}
}
else{
return "Could not get lock";
@ -57,13 +76,8 @@ class Pen{
catch(Exception e){
System.out.println(e.getMessage());
}
finally {
if(hasLock)
lock.unlock();
}
return "";
}
}
@AllArgsConstructor
@ -74,8 +88,8 @@ class VendorWithLock1 implements Runnable{
@Override
public void run() {
System.out.println(Thread.currentThread() + paper.procurePaper());
System.out.println(Thread.currentThread() + pen.procurePen());
System.out.println(Thread.currentThread() + ":" + paper.procurePaper());
System.out.println(Thread.currentThread() + ":" + pen.procurePen());
}
}