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ConcurrentSortedLinkedList
Commit f7a214e2 authored by Mohamad Bashar Desoki's avatar Mohamad Bashar Desoki
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Concurrent Sorted Linked List Implementations

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README.MD 0 → 100644
View file @ f7a214e2
# Concurrent Sorted Linked List
## Introduction
We try to implement a concurrent sorted linked list in different manners to get thread-safe and suitable performance on this data structure.
## Content
* Data Race.
* Mutual Exclusion.
* Structured Lock (synchronized).
* Unstructured Lock (ReentrantLock, ReentrantReadWriteLock).
* Test different implementations' performance.
## TO-DO
* Test throughput (operations per second) for different Sorted Linked List Implementations.
pom.xml 0 → 100644
View file @ f7a214e2
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>SortLinkedList</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
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src/main/java/Entry.java 0 → 100644
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public class Entry {
public Integer object;
public Entry next;
public Entry(Integer object) {
this.object = object;
}
}
src/main/java/LockList.java 0 → 100644
View file @ f7a214e2
import java.util.concurrent.locks.ReentrantLock;
public class LockList extends SortList {
ReentrantLock lock = new ReentrantLock();
public LockList() {
super();
}
@Override
public boolean add(Integer obj) {
try {
lock.lock();
Entry prev = this.head;
Entry curr = prev.next;
while (curr.object.compareTo(obj) < 0) {
prev = curr;
curr = prev.next;
}
if (curr.object.equals(obj) || prev.object.equals(obj)) {
return false;
} else {
Entry newEntry = new Entry(obj);
newEntry.next = curr;
prev.next = newEntry;
return true;
}
} finally {
lock.unlock();
}
}
@Override
public boolean remove(Integer obj) {
try {
lock.lock();
Entry prev = this.head;
Entry curr = prev.next;
while (curr.object.compareTo(obj) < 0) {
prev = curr;
curr = prev.next;
}
if (curr.object.equals(obj)) {
prev.next = curr.next;
return true;
} else {
return false;
}
} finally {
lock.unlock();
}
}
@Override
public boolean contain(Integer obj) {
try {
lock.lock();
Entry prev = this.head;
Entry curr = prev.next;
while (curr.object.compareTo(obj) < 0) {
prev = curr;
curr = prev.next;
}
if (curr.object.equals(obj) || prev.object.equals(obj)) {
return true;
} else {
return false;
}
} finally {
lock.unlock();
}
}
}
src/main/java/RWLockList.java 0 → 100644
View file @ f7a214e2
import java.util.concurrent.locks.ReentrantReadWriteLock;
public class RWLockList extends SortList {
ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
public RWLockList() {
super();
}
@Override
public boolean add(Integer obj) {
try {
lock.writeLock().lock();
Entry prev = this.head;
Entry curr = prev.next;
while (curr.object.compareTo(obj) < 0) {
prev = curr;
curr = prev.next;
}
if (curr.object.equals(obj) || prev.object.equals(obj)) {
return false;
} else {
Entry newEntry = new Entry(obj);
newEntry.next = curr;
prev.next = newEntry;
return true;
}
} finally {
lock.writeLock().unlock();
}
}
@Override
public boolean remove(Integer obj) {
try {
lock.writeLock().lock();
Entry prev = this.head;
Entry curr = prev.next;
while (curr.object.compareTo(obj) < 0) {
prev = curr;
curr = prev.next;
}
if (curr.object.equals(obj)) {
prev.next = curr.next;
return true;
} else {
return false;
}
} finally {
lock.writeLock().unlock();
}
}
@Override
public boolean contain(Integer obj) {
try {
lock.readLock().lock();
Entry prev = this.head;
Entry curr = prev.next;
while (curr.object.compareTo(obj) < 0) {
prev = curr;
curr = prev.next;
}
if (curr.object.equals(obj) || prev.object.equals(obj)) {
return true;
} else {
return false;
}
} finally {
lock.readLock().unlock();
}
}
}
src/main/java/SortList.java 0 → 100644
View file @ f7a214e2
public abstract class SortList {
public Entry head;
public SortList() {
this.head = new Entry(Integer.MIN_VALUE);
this.head.next =new Entry(Integer.MAX_VALUE);
}
public abstract boolean add(Integer obj);
public abstract boolean remove(Integer obj);
public abstract boolean contain(Integer obj);
public void printList(){
Entry curr = this.head;
while (curr != null){
System.out.println(curr.object);
curr = curr.next;
}
}
}
src/main/java/SyncList.java 0 → 100644
View file @ f7a214e2
public class SyncList extends SortList {
public SyncList() {
super();
}
@Override
public synchronized boolean add(Integer obj) {
Entry prev = this.head;
Entry curr = prev.next;
while (curr.object.compareTo(obj) < 0) {
prev = curr;
curr = prev.next;
}
if (curr.object.equals(obj) || prev.object.equals(obj)) {
return false;
} else {
Entry newEntry = new Entry(obj);
newEntry.next = curr;
prev.next = newEntry;
return true;
}
}
@Override
public synchronized boolean remove(Integer obj) {
Entry prev = this.head;
Entry curr = prev.next;
while (curr.object.compareTo(obj) < 0) {
prev = curr;
curr = prev.next;
}
if (curr.object.equals(obj)) {
prev.next = curr.next;
return true;
} else {
return false;
}
}
@Override
public synchronized boolean contain(Integer obj) {
Entry prev = this.head;
Entry curr = prev.next;
while (curr.object.compareTo(obj) < 0) {
prev = curr;
curr = prev.next;
}
if (curr.object.equals(obj) || prev.object.equals(obj)) {
return true;
} else {
return false;
}
}
}
src/test/java/SyncListTest.java 0 → 100644
View file @ f7a214e2
import junit.framework.TestCase;
public class SyncListTest extends TestCase {
public void testAddList(){
SyncList syncList = new SyncList();
syncList.add(1);
syncList.add(2);
syncList.add(3);
syncList.add(Integer.MIN_VALUE);
syncList.add(3);
System.out.println(syncList.contain(5));
System.out.println(syncList.contain(2));
syncList.remove(3);
syncList.printList();
}
}
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