Concurrent Sorted Linked List Implementations

.gitignore

+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file

.idea/encodings.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding">
+    <file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
+  </component>
+</project>
\ No newline at end of file

.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="MavenProjectsManager">
+    <option name="originalFiles">
+      <list>
+        <option value="$PROJECT_DIR$/pom.xml" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="17" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file

.idea/uiDesigner.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Palette2">
+    <group name="Swing">
+      <item class="com.intellij.uiDesigner.HSpacer" tooltip-text="Horizontal Spacer" icon="/com/intellij/uiDesigner/icons/hspacer.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="1" hsize-policy="6" anchor="0" fill="1" />
+      </item>
+      <item class="com.intellij.uiDesigner.VSpacer" tooltip-text="Vertical Spacer" icon="/com/intellij/uiDesigner/icons/vspacer.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="1" anchor="0" fill="2" />
+      </item>
+      <item class="javax.swing.JPanel" icon="/com/intellij/uiDesigner/icons/panel.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3" />
+      </item>
+      <item class="javax.swing.JScrollPane" icon="/com/intellij/uiDesigner/icons/scrollPane.svg" removable="false" auto-create-binding="false" can-attach-label="true">
+        <default-constraints vsize-policy="7" hsize-policy="7" anchor="0" fill="3" />
+      </item>
+      <item class="javax.swing.JButton" icon="/com/intellij/uiDesigner/icons/button.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="3" anchor="0" fill="1" />
+        <initial-values>
+          <property name="text" value="Button" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JRadioButton" icon="/com/intellij/uiDesigner/icons/radioButton.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="3" anchor="8" fill="0" />
+        <initial-values>
+          <property name="text" value="RadioButton" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JCheckBox" icon="/com/intellij/uiDesigner/icons/checkBox.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="3" anchor="8" fill="0" />
+        <initial-values>
+          <property name="text" value="CheckBox" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JLabel" icon="/com/intellij/uiDesigner/icons/label.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="0" anchor="8" fill="0" />
+        <initial-values>
+          <property name="text" value="Label" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JTextField" icon="/com/intellij/uiDesigner/icons/textField.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
+          <preferred-size width="150" height="-1" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JPasswordField" icon="/com/intellij/uiDesigner/icons/passwordField.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
+          <preferred-size width="150" height="-1" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JFormattedTextField" icon="/com/intellij/uiDesigner/icons/formattedTextField.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
+          <preferred-size width="150" height="-1" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTextArea" icon="/com/intellij/uiDesigner/icons/textArea.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTextPane" icon="/com/intellij/uiDesigner/icons/textPane.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JEditorPane" icon="/com/intellij/uiDesigner/icons/editorPane.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JComboBox" icon="/com/intellij/uiDesigner/icons/comboBox.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="2" anchor="8" fill="1" />
+      </item>
+      <item class="javax.swing.JTable" icon="/com/intellij/uiDesigner/icons/table.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JList" icon="/com/intellij/uiDesigner/icons/list.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="2" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTree" icon="/com/intellij/uiDesigner/icons/tree.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTabbedPane" icon="/com/intellij/uiDesigner/icons/tabbedPane.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3">
+          <preferred-size width="200" height="200" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JSplitPane" icon="/com/intellij/uiDesigner/icons/splitPane.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3">
+          <preferred-size width="200" height="200" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JSpinner" icon="/com/intellij/uiDesigner/icons/spinner.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1" />
+      </item>
+      <item class="javax.swing.JSlider" icon="/com/intellij/uiDesigner/icons/slider.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1" />
+      </item>
+      <item class="javax.swing.JSeparator" icon="/com/intellij/uiDesigner/icons/separator.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3" />
+      </item>
+      <item class="javax.swing.JProgressBar" icon="/com/intellij/uiDesigner/icons/progressbar.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="0" fill="1" />
+      </item>
+      <item class="javax.swing.JToolBar" icon="/com/intellij/uiDesigner/icons/toolbar.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="0" fill="1">
+          <preferred-size width="-1" height="20" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JToolBar$Separator" icon="/com/intellij/uiDesigner/icons/toolbarSeparator.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="0" anchor="0" fill="1" />
+      </item>
+      <item class="javax.swing.JScrollBar" icon="/com/intellij/uiDesigner/icons/scrollbar.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="0" anchor="0" fill="2" />
+      </item>
+    </group>
+  </component>
+</project>
\ No newline at end of file

.idea/vcs.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file

.idea/workspace.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AutoImportSettings">
+    <option name="autoReloadType" value="SELECTIVE" />
+  </component>
+  <component name="ChangeListManager">
+    <list default="true" id="3f4b2924-17d7-4794-bacf-d51c4f0be8bb" name="Changes" comment="Concurrent Sorted Linked List Implementations">
+      <change afterPath="$PROJECT_DIR$/.gitignore" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/.idea/encodings.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/.idea/misc.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/.idea/uiDesigner.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/.idea/vcs.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/README.MD" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/pom.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/src/main/java/Entry.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/src/main/java/LockList.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/src/main/java/RWLockList.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/src/main/java/SortList.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/src/main/java/SyncList.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/src/test/java/SyncListTest.java" afterDir="false" />
+    </list>
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="FileTemplateManagerImpl">
+    <option name="RECENT_TEMPLATES">
+      <list>
+        <option value="Class" />
+      </list>
+    </option>
+  </component>
+  <component name="Git.Settings">
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
+  </component>
+  <component name="MarkdownSettingsMigration">
+    <option name="stateVersion" value="1" />
+  </component>
+  <component name="ProjectId" id="2NMPKhBDgdyw9qxmyQBX74HdmhD" />
+  <component name="ProjectLevelVcsManager" settingsEditedManually="true">
+    <ConfirmationsSetting value="2" id="Add" />
+  </component>
+  <component name="ProjectViewState">
+    <option name="hideEmptyMiddlePackages" value="true" />
+    <option name="showLibraryContents" value="true" />
+  </component>
+  <component name="PropertiesComponent"><![CDATA[{
+  "keyToString": {
+    "ASKED_ADD_EXTERNAL_FILES": "true",
+    "RunOnceActivity.OpenProjectViewOnStart": "true",
+    "RunOnceActivity.ShowReadmeOnStart": "true",
+    "SHARE_PROJECT_CONFIGURATION_FILES": "true",
+    "project.structure.last.edited": "Modules",
+    "project.structure.proportion": "0.0",
+    "project.structure.side.proportion": "0.0"
+  }
+}]]></component>
+  <component name="RunManager">
+    <configuration name="SyncListTest.testAddList" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
+      <module name="SortLinkedList" />
+      <option name="PACKAGE_NAME" value="" />
+      <option name="MAIN_CLASS_NAME" value="SyncListTest" />
+      <option name="METHOD_NAME" value="testAddList" />
+      <option name="TEST_OBJECT" value="method" />
+      <method v="2">
+        <option name="Make" enabled="true" />
+      </method>
+    </configuration>
+    <recent_temporary>
+      <list>
+        <item itemvalue="JUnit.SyncListTest.testAddList" />
+      </list>
+    </recent_temporary>
+  </component>
+  <component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="application-level" UseSingleDictionary="true" transferred="true" />
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="3f4b2924-17d7-4794-bacf-d51c4f0be8bb" name="Changes" comment="" />
+      <created>1679470917075</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1679470917075</updated>
+    </task>
+    <servers />
+  </component>
+  <component name="Vcs.Log.Tabs.Properties">
+    <option name="TAB_STATES">
+      <map>
+        <entry key="MAIN">
+          <value>
+            <State />
+          </value>
+        </entry>
+      </map>
+    </option>
+  </component>
+  <component name="VcsManagerConfiguration">
+    <option name="ADD_EXTERNAL_FILES_SILENTLY" value="true" />
+    <MESSAGE value="Concurrent Sorted Linked List Implementations" />
+    <option name="LAST_COMMIT_MESSAGE" value="Concurrent Sorted Linked List Implementations" />
+  </component>
+</project>
\ No newline at end of file

README.MD

+# 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

+<?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"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.example</groupId>
+    <artifactId>SortLinkedList</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.13.2</version>
+        </dependency>
+    </dependencies>
+
+
+</project>
\ No newline at end of file

src/main/java/Entry.java

+public class Entry {
+
+    public Integer object;
+
+    public Entry next;
+
+    public Entry(Integer object) {
+        this.object = object;
+    }
+}

src/main/java/LockList.java

+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

+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

+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

+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

+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();
+
+
+    }
+}