Feature/aop lib

aop/build.gradle

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+plugins {
+    id 'java-library'
+}
+
+group = 'com.callv2'
+version = '1.0-SNAPSHOT'
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+
+    implementation 'org.aspectj:aspectjrt:1.9.24'
+
+    testImplementation 'org.junit.jupiter:junit-jupiter:5.11.4'
+    testImplementation 'org.mockito:mockito-junit-jupiter:5.15.2'
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+
+}
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(21)
+    }
+}
+
+tasks.named('test') {
+    useJUnitPlatform()
+}

aop/src/main/java/com/callv2/aop/context/AbstractInvocationContext.java

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+package com.callv2.aop.context;
+
+import java.time.Instant;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import org.aspectj.lang.ProceedingJoinPoint;
+import org.aspectj.lang.Signature;
+import org.aspectj.lang.reflect.SourceLocation;
+import org.aspectj.runtime.internal.AroundClosure;
+
+public abstract class AbstractInvocationContext implements InvocationContext {
+
+    protected final ProceedingJoinPoint joinPoint;
+    protected final AtomicBoolean proceeded;
+    private final Instant contextedAt;
+
+    protected AbstractInvocationContext(final ProceedingJoinPoint joinPoint) {
+        this.joinPoint = joinPoint;
+        this.proceeded = new AtomicBoolean(false);
+        this.contextedAt = Instant.now();
+    }
+
+    protected AbstractInvocationContext(final PreInvocationContext preInvocationContext) {
+        this.joinPoint = preInvocationContext;
+        this.proceeded = new AtomicBoolean(preInvocationContext.proceeded());
+        this.contextedAt = preInvocationContext.getContextedAt();
+    }
+
+    @Override
+    public void set$AroundClosure(AroundClosure arc) {
+        this.joinPoint.set$AroundClosure(arc);
+    }
+
+    @Override
+    public String toShortString() {
+        return this.joinPoint.toShortString();
+    }
+
+    @Override
+    public String toLongString() {
+        return this.joinPoint.toLongString();
+    }
+
+    @Override
+    public Object getThis() {
+        return this.joinPoint.getThis();
+    }
+
+    @Override
+    public Object getTarget() {
+        return this.joinPoint.getTarget();
+    }
+
+    @Override
+    public Object[] getArgs() {
+        return this.joinPoint.getArgs();
+    }
+
+    @Override
+    public Signature getSignature() {
+        return this.joinPoint.getSignature();
+    }
+
+    @Override
+    public SourceLocation getSourceLocation() {
+        return this.joinPoint.getSourceLocation();
+    }
+
+    @Override
+    public String getKind() {
+        return this.joinPoint.getKind();
+    }
+
+    @Override
+    public StaticPart getStaticPart() {
+        return this.joinPoint.getStaticPart();
+    }
+
+    @Override
+    public Instant getContextedAt() {
+        return this.contextedAt;
+    }
+
+    @Override
+    public boolean proceeded() {
+        return this.proceeded.get();
+    }
+
+}

aop/src/main/java/com/callv2/aop/context/InvocationContext.java

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+package com.callv2.aop.context;
+
+import java.time.Instant;
+
+import org.aspectj.lang.ProceedingJoinPoint;
+
+public interface InvocationContext extends ProceedingJoinPoint {
+
+    Instant getContextedAt();
+
+    boolean proceeded();
+
+}

aop/src/main/java/com/callv2/aop/context/PostInvocationContext.java

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+package com.callv2.aop.context;
+
+import java.time.Instant;
+
+public interface PostInvocationContext extends InvocationContext {
+
+    Instant getProceededAt();
+
+    Object getResult();
+
+    Throwable getThrowable();
+
+    boolean wasSuccessful();
+
+}

aop/src/main/java/com/callv2/aop/context/PreInvocationContext.java

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+package com.callv2.aop.context;
+
+public interface PreInvocationContext extends InvocationContext {
+
+    PostInvocationContext proceedWithContext();
+
+}

aop/src/main/java/com/callv2/aop/context/SimplePostInvocationContext.java

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+package com.callv2.aop.context;
+
+import java.time.Instant;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+public final class SimplePostInvocationContext extends AbstractInvocationContext implements PostInvocationContext {
+
+    private final Object result;
+    private final Throwable throwable;
+    private final Instant proceededAt;
+    private final AtomicBoolean successful;
+
+    private SimplePostInvocationContext(
+            final PreInvocationContext preInvocationContext,
+            final Object result,
+            final Throwable throwable,
+            final Instant proceededAt,
+            final boolean successful) {
+        super(preInvocationContext);
+        this.result = result;
+        this.throwable = throwable;
+        this.proceededAt = proceededAt;
+        this.successful = new AtomicBoolean(successful);
+    }
+
+    protected static SimplePostInvocationContext from(final PreInvocationContext preInvocationContext) {
+
+        Object result;
+        Throwable throwable;
+        boolean successful;
+        final Instant proceededAt;
+
+        try {
+            result = preInvocationContext.proceed();
+            throwable = null;
+            successful = true;
+        } catch (Throwable e) {
+            result = null;
+            throwable = e;
+            successful = false;
+        } finally {
+            proceededAt = Instant.now();
+        }
+
+        return new SimplePostInvocationContext(
+                preInvocationContext,
+                result,
+                throwable,
+                proceededAt,
+                successful);
+
+    }
+
+    @Override
+    public Object proceed() throws Throwable {
+        if (this.proceeded.get()) {
+            if (successful.get())
+                return result;
+            else
+                throw throwable;
+        }
+
+        return this.joinPoint.proceed();
+    }
+
+    @Override
+    public Object proceed(Object[] args) throws Throwable {
+        if (this.proceeded.get()) {
+            if (successful.get())
+                return result;
+            else
+                throw throwable;
+        }
+
+        return this.joinPoint.proceed(args);
+    }
+
+    @Override
+    public Instant getProceededAt() {
+        return this.proceededAt;
+    }
+
+    @Override
+    public Object getResult() {
+        return this.result;
+    }
+
+    @Override
+    public Throwable getThrowable() {
+        return this.throwable;
+    }
+
+    @Override
+    public boolean wasSuccessful() {
+        return this.successful.get();
+    }
+
+}

aop/src/main/java/com/callv2/aop/context/SimplePreInvocationContext.java

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+package com.callv2.aop.context;
+
+import org.aspectj.lang.ProceedingJoinPoint;
+
+public final class SimplePreInvocationContext extends AbstractInvocationContext implements PreInvocationContext {
+
+    private SimplePreInvocationContext(final ProceedingJoinPoint joinPoint) {
+        super(joinPoint);
+    }
+
+    public static SimplePreInvocationContext of(final ProceedingJoinPoint joinPoint) {
+        return new SimplePreInvocationContext(joinPoint);
+    }
+
+    @Override
+    public Object proceed() throws Throwable {
+        if (proceeded.getAndSet(true))
+            throw new IllegalStateException("Method already proceeded");
+        return joinPoint.proceed();
+    }
+
+    @Override
+    public Object proceed(Object[] args) throws Throwable {
+        if (proceeded.getAndSet(true))
+            throw new IllegalStateException("Method already proceeded");
+        return joinPoint.proceed(args);
+    }
+
+    @Override
+    public PostInvocationContext proceedWithContext() {
+        return SimplePostInvocationContext.from(this);
+    }
+
+}

aop/src/main/java/com/callv2/aop/executor/Executor.java

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+package com.callv2.aop.executor;
+
+import org.aspectj.lang.ProceedingJoinPoint;
+
+@FunctionalInterface
+public interface Executor<J extends ProceedingJoinPoint> {
+
+    void execute(J joinPoint);
+
+}

aop/src/main/java/com/callv2/aop/executor/PostExecutor.java

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+package com.callv2.aop.executor;
+
+import com.callv2.aop.context.PostInvocationContext;
+
+public interface PostExecutor extends Executor<PostInvocationContext> {
+
+}

aop/src/main/java/com/callv2/aop/executor/PreExecutor.java

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+package com.callv2.aop.executor;
+
+import com.callv2.aop.context.PreInvocationContext;
+
+public interface PreExecutor extends Executor<PreInvocationContext> {
+
+}

aop/src/main/java/com/callv2/aop/executor/chain/ExecutorChain.java

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+package com.callv2.aop.executor.chain;
+
+import org.aspectj.lang.ProceedingJoinPoint;
+
+import com.callv2.aop.executor.Executor;
+
+public abstract class ExecutorChain<O, J extends ProceedingJoinPoint, E extends Executor<J>> {
+
+    private ExecutorChain<O, J, E> next;
+    private final E executor;
+
+    protected ExecutorChain(final E executor) {
+        this.executor = executor;
+    }
+
+    public ExecutorChain<O, J, E> setNext(final ExecutorChain<O, J, E> executorChain) {
+        return this.next = executorChain;
+    }
+
+    public final O execute(final J joinpoint) throws Throwable {
+
+        this.executor.execute(joinpoint);
+
+        if (next != null)
+            return next.execute(joinpoint);
+
+        return resolve(joinpoint);
+    }
+
+    protected abstract O resolve(J joinPoint) throws Throwable;
+
+}

aop/src/main/java/com/callv2/aop/executor/chain/PostInvocationExecutorChain.java

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+package com.callv2.aop.executor.chain;
+
+import com.callv2.aop.context.PostInvocationContext;
+import com.callv2.aop.executor.PostExecutor;
+
+public final class PostInvocationExecutorChain
+        extends ExecutorChain<Object, PostInvocationContext, PostExecutor> {
+
+    public PostInvocationExecutorChain(final PostExecutor executor) {
+        super(executor);
+    }
+
+    @Override
+    protected Object resolve(final PostInvocationContext joinPoint) throws Throwable {
+        if (joinPoint.wasSuccessful())
+            return joinPoint.getResult();
+        else
+            throw joinPoint.getThrowable();
+    }
+
+}

aop/src/main/java/com/callv2/aop/executor/chain/PreInvocationExecutorChain.java

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+package com.callv2.aop.executor.chain;
+
+import com.callv2.aop.context.PostInvocationContext;
+import com.callv2.aop.context.PreInvocationContext;
+import com.callv2.aop.executor.PreExecutor;
+
+public final class PreInvocationExecutorChain
+        extends ExecutorChain<PostInvocationContext, PreInvocationContext, PreExecutor> {
+
+    public PreInvocationExecutorChain(final PreExecutor executor) {
+        super(executor);
+    }
+
+    @Override
+    protected PostInvocationContext resolve(final PreInvocationContext joinPoint) throws Throwable {
+        return joinPoint.proceedWithContext();
+    }
+
+}