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added revision number and cas failure count

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This commit is contained in:
Gergo Petrik 2020-05-17 10:07:47 +02:00
parent fd32bd2f4d
commit 12ef94be39
1 changed files with 32 additions and 15 deletions
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47
core-java-modules/core-java-concurrency-advanced-3/src/main/java/com/baeldung/abaproblem/Account.java
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@ -1,39 +1,53 @@
package com.baeldung.abaproblem;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
public class Account {
private AtomicInteger balance = new AtomicInteger(0);
private List<Long> transactionDates = new ArrayList<>();
private AtomicInteger balance;
private AtomicInteger transactionCount;
private ThreadLocal<Integer> currentThreadCASFailureCount;
public Account() {
this.balance = new AtomicInteger(0);
this.transactionCount = new AtomicInteger(0);
this.currentThreadCASFailureCount = new ThreadLocal<>();
this.currentThreadCASFailureCount.set(0);
}
public int getBalance() {
return balance.get();
}
public List<Long> getTransactionDates() {
return transactionDates;
public int getTransactionCount() {
return transactionCount.get();
}
public boolean withdraw(int amount) throws InterruptedException {
public int getCurrentThreadCASFailureCount() {
return currentThreadCASFailureCount.get();
}
public boolean withdraw(int amount) {
int current = getBalance();
if (current < amount) {
throw new RuntimeException("Not sufficient balance");
}
precessBalance();
maybeWait();
boolean result = balance.compareAndSet(current, current - amount);
if (result) {
transactionDates.add(System.currentTimeMillis());
transactionCount.incrementAndGet();
} else {
int currentCASFailureCount = currentThreadCASFailureCount.get();
currentThreadCASFailureCount.set(currentCASFailureCount + 1);
}
return result;
}
private void precessBalance() throws InterruptedException {
private void maybeWait() {
if ("thread1".equals(Thread.currentThread().getName())) {
TimeUnit.SECONDS.sleep(2);
try {
TimeUnit.SECONDS.sleep(2);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
}
@ -41,7 +55,10 @@ public class Account {
int current = balance.get();
boolean result = balance.compareAndSet(current, current + amount);
if (result) {
transactionDates.add(System.currentTimeMillis());
transactionCount.incrementAndGet();
} else {
int currentCASFailureCount = currentThreadCASFailureCount.get();
currentThreadCASFailureCount.set(currentCASFailureCount + 1);
}
return result;
}