public final class io.reactivex.subjects.SingleSubject<T> extends io.reactivex.Single<T> implements io.reactivex.SingleObserver<T>
minor version: 0
major version: 59
flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
this_class: io.reactivex.subjects.SingleSubject
super_class: io.reactivex.Single
{
final java.util.concurrent.atomic.AtomicReference<io.reactivex.subjects.SingleSubject$SingleDisposable<T>[]> observers;
descriptor: Ljava/util/concurrent/atomic/AtomicReference;
flags: (0x0010) ACC_FINAL
Signature: Ljava/util/concurrent/atomic/AtomicReference<[Lio/reactivex/subjects/SingleSubject$SingleDisposable<TT;>;>;
static final io.reactivex.subjects.SingleSubject$SingleDisposable[] EMPTY;
descriptor: [Lio/reactivex/subjects/SingleSubject$SingleDisposable;
flags: (0x0018) ACC_STATIC, ACC_FINAL
static final io.reactivex.subjects.SingleSubject$SingleDisposable[] TERMINATED;
descriptor: [Lio/reactivex/subjects/SingleSubject$SingleDisposable;
flags: (0x0018) ACC_STATIC, ACC_FINAL
final java.util.concurrent.atomic.AtomicBoolean once;
descriptor: Ljava/util/concurrent/atomic/AtomicBoolean;
flags: (0x0010) ACC_FINAL
T value;
descriptor: Ljava/lang/Object;
flags: (0x0000)
Signature: TT;
java.lang.Throwable error;
descriptor: Ljava/lang/Throwable;
flags: (0x0000)
static void <clinit>();
descriptor: ()V
flags: (0x0008) ACC_STATIC
Code:
stack=1, locals=0, args_size=0
0: iconst_0
anewarray io.reactivex.subjects.SingleSubject$SingleDisposable
putstatic io.reactivex.subjects.SingleSubject.EMPTY:[Lio/reactivex/subjects/SingleSubject$SingleDisposable;
1: iconst_0
anewarray io.reactivex.subjects.SingleSubject$SingleDisposable
putstatic io.reactivex.subjects.SingleSubject.TERMINATED:[Lio/reactivex/subjects/SingleSubject$SingleDisposable;
return
LocalVariableTable:
Start End Slot Name Signature
public static <T> io.reactivex.subjects.SingleSubject<T> create();
descriptor: ()Lio/reactivex/subjects/SingleSubject;
flags: (0x0009) ACC_PUBLIC, ACC_STATIC
Code:
stack=2, locals=0, args_size=0
0: new io.reactivex.subjects.SingleSubject
dup
invokespecial io.reactivex.subjects.SingleSubject.<init>:()V
areturn
LocalVariableTable:
Start End Slot Name Signature
Signature: <T:Ljava/lang/Object;>()Lio/reactivex/subjects/SingleSubject<TT;>;
RuntimeVisibleAnnotations:
io.reactivex.annotations.CheckReturnValue()
RuntimeInvisibleAnnotations:
io.reactivex.annotations.NonNull()
void <init>();
descriptor: ()V
flags: (0x0000)
Code:
stack=4, locals=1, args_size=1
start local 0 0: aload 0
invokespecial io.reactivex.Single.<init>:()V
1: aload 0
new java.util.concurrent.atomic.AtomicBoolean
dup
invokespecial java.util.concurrent.atomic.AtomicBoolean.<init>:()V
putfield io.reactivex.subjects.SingleSubject.once:Ljava/util/concurrent/atomic/AtomicBoolean;
2: aload 0
new java.util.concurrent.atomic.AtomicReference
dup
getstatic io.reactivex.subjects.SingleSubject.EMPTY:[Lio/reactivex/subjects/SingleSubject$SingleDisposable;
invokespecial java.util.concurrent.atomic.AtomicReference.<init>:(Ljava/lang/Object;)V
putfield io.reactivex.subjects.SingleSubject.observers:Ljava/util/concurrent/atomic/AtomicReference;
3: return
end local 0 LocalVariableTable:
Start End Slot Name Signature
0 4 0 this Lio/reactivex/subjects/SingleSubject<TT;>;
public void onSubscribe(io.reactivex.disposables.Disposable);
descriptor: (Lio/reactivex/disposables/Disposable;)V
flags: (0x0001) ACC_PUBLIC
Code:
stack=2, locals=2, args_size=2
start local 0 start local 1 0: aload 0
getfield io.reactivex.subjects.SingleSubject.observers:Ljava/util/concurrent/atomic/AtomicReference;
invokevirtual java.util.concurrent.atomic.AtomicReference.get:()Ljava/lang/Object;
getstatic io.reactivex.subjects.SingleSubject.TERMINATED:[Lio/reactivex/subjects/SingleSubject$SingleDisposable;
if_acmpne 2
1: aload 1
invokeinterface io.reactivex.disposables.Disposable.dispose:()V
2: StackMap locals:
StackMap stack:
return
end local 1 end local 0 LocalVariableTable:
Start End Slot Name Signature
0 3 0 this Lio/reactivex/subjects/SingleSubject<TT;>;
0 3 1 d Lio/reactivex/disposables/Disposable;
RuntimeInvisibleParameterAnnotations:
0:
io.reactivex.annotations.NonNull()
MethodParameters:
Name Flags
d
public void onSuccess();
descriptor: (Ljava/lang/Object;)V
flags: (0x0001) ACC_PUBLIC
Code:
stack=3, locals=6, args_size=2
start local 0 start local 1 0: aload 1
ldc "onSuccess called with null. Null values are generally not allowed in 2.x operators and sources."
invokestatic io.reactivex.internal.functions.ObjectHelper.requireNonNull:(Ljava/lang/Object;Ljava/lang/String;)Ljava/lang/Object;
pop
1: aload 0
getfield io.reactivex.subjects.SingleSubject.once:Ljava/util/concurrent/atomic/AtomicBoolean;
iconst_0
iconst_1
invokevirtual java.util.concurrent.atomic.AtomicBoolean.compareAndSet:(ZZ)Z
ifeq 8
2: aload 0
aload 1
putfield io.reactivex.subjects.SingleSubject.value:Ljava/lang/Object;
3: aload 0
getfield io.reactivex.subjects.SingleSubject.observers:Ljava/util/concurrent/atomic/AtomicReference;
getstatic io.reactivex.subjects.SingleSubject.TERMINATED:[Lio/reactivex/subjects/SingleSubject$SingleDisposable;
invokevirtual java.util.concurrent.atomic.AtomicReference.getAndSet:(Ljava/lang/Object;)Ljava/lang/Object;
checkcast io.reactivex.subjects.SingleSubject$SingleDisposable[]
dup
astore 5
arraylength
istore 4
iconst_0
istore 3
goto 7
StackMap locals: io.reactivex.subjects.SingleSubject java.lang.Object top int int io.reactivex.subjects.SingleSubject$SingleDisposable[]
StackMap stack:
4: aload 5
iload 3
aaload
astore 2
start local 2 5: aload 2
getfield io.reactivex.subjects.SingleSubject$SingleDisposable.downstream:Lio/reactivex/SingleObserver;
aload 1
invokeinterface io.reactivex.SingleObserver.onSuccess:(Ljava/lang/Object;)V
end local 2 6: iinc 3 1
StackMap locals:
StackMap stack:
7: iload 3
iload 4
if_icmplt 4
8: StackMap locals: io.reactivex.subjects.SingleSubject java.lang.Object
StackMap stack:
return
end local 1 end local 0 LocalVariableTable:
Start End Slot Name Signature
0 9 0 this Lio/reactivex/subjects/SingleSubject<TT;>;
0 9 1 value TT;
5 6 2 md Lio/reactivex/subjects/SingleSubject$SingleDisposable<TT;>;
Signature: (TT;)V
RuntimeInvisibleParameterAnnotations:
0:
io.reactivex.annotations.NonNull()
MethodParameters:
Name Flags
value
public void onError(java.lang.Throwable);
descriptor: (Ljava/lang/Throwable;)V
flags: (0x0001) ACC_PUBLIC
Code:
stack=3, locals=6, args_size=2
start local 0 start local 1 0: aload 1
ldc "onError called with null. Null values are generally not allowed in 2.x operators and sources."
invokestatic io.reactivex.internal.functions.ObjectHelper.requireNonNull:(Ljava/lang/Object;Ljava/lang/String;)Ljava/lang/Object;
pop
1: aload 0
getfield io.reactivex.subjects.SingleSubject.once:Ljava/util/concurrent/atomic/AtomicBoolean;
iconst_0
iconst_1
invokevirtual java.util.concurrent.atomic.AtomicBoolean.compareAndSet:(ZZ)Z
ifeq 9
2: aload 0
aload 1
putfield io.reactivex.subjects.SingleSubject.error:Ljava/lang/Throwable;
3: aload 0
getfield io.reactivex.subjects.SingleSubject.observers:Ljava/util/concurrent/atomic/AtomicReference;
getstatic io.reactivex.subjects.SingleSubject.TERMINATED:[Lio/reactivex/subjects/SingleSubject$SingleDisposable;
invokevirtual java.util.concurrent.atomic.AtomicReference.getAndSet:(Ljava/lang/Object;)Ljava/lang/Object;
checkcast io.reactivex.subjects.SingleSubject$SingleDisposable[]
dup
astore 5
arraylength
istore 4
iconst_0
istore 3
goto 7
StackMap locals: io.reactivex.subjects.SingleSubject java.lang.Throwable top int int io.reactivex.subjects.SingleSubject$SingleDisposable[]
StackMap stack:
4: aload 5
iload 3
aaload
astore 2
start local 2 5: aload 2
getfield io.reactivex.subjects.SingleSubject$SingleDisposable.downstream:Lio/reactivex/SingleObserver;
aload 1
invokeinterface io.reactivex.SingleObserver.onError:(Ljava/lang/Throwable;)V
end local 2 6: iinc 3 1
StackMap locals:
StackMap stack:
7: iload 3
iload 4
if_icmplt 4
8: goto 10
9: StackMap locals: io.reactivex.subjects.SingleSubject java.lang.Throwable
StackMap stack:
aload 1
invokestatic io.reactivex.plugins.RxJavaPlugins.onError:(Ljava/lang/Throwable;)V
10: StackMap locals:
StackMap stack:
return
end local 1 end local 0 LocalVariableTable:
Start End Slot Name Signature
0 11 0 this Lio/reactivex/subjects/SingleSubject<TT;>;
0 11 1 e Ljava/lang/Throwable;
5 6 2 md Lio/reactivex/subjects/SingleSubject$SingleDisposable<TT;>;
RuntimeInvisibleParameterAnnotations:
0:
io.reactivex.annotations.NonNull()
MethodParameters:
Name Flags
e
protected void subscribeActual(io.reactivex.SingleObserver<? super T>);
descriptor: (Lio/reactivex/SingleObserver;)V
flags: (0x0004) ACC_PROTECTED
Code:
stack=4, locals=4, args_size=2
start local 0 start local 1 0: new io.reactivex.subjects.SingleSubject$SingleDisposable
dup
aload 1
aload 0
invokespecial io.reactivex.subjects.SingleSubject$SingleDisposable.<init>:(Lio/reactivex/SingleObserver;Lio/reactivex/subjects/SingleSubject;)V
astore 2
start local 2 1: aload 1
aload 2
invokeinterface io.reactivex.SingleObserver.onSubscribe:(Lio/reactivex/disposables/Disposable;)V
2: aload 0
aload 2
invokevirtual io.reactivex.subjects.SingleSubject.add:(Lio/reactivex/subjects/SingleSubject$SingleDisposable;)Z
ifeq 6
3: aload 2
invokevirtual io.reactivex.subjects.SingleSubject$SingleDisposable.isDisposed:()Z
ifeq 11
4: aload 0
aload 2
invokevirtual io.reactivex.subjects.SingleSubject.remove:(Lio/reactivex/subjects/SingleSubject$SingleDisposable;)V
5: goto 11
6: StackMap locals: io.reactivex.subjects.SingleSubject$SingleDisposable
StackMap stack:
aload 0
getfield io.reactivex.subjects.SingleSubject.error:Ljava/lang/Throwable;
astore 3
start local 3 7: aload 3
ifnull 10
8: aload 1
aload 3
invokeinterface io.reactivex.SingleObserver.onError:(Ljava/lang/Throwable;)V
9: goto 11
10: StackMap locals: java.lang.Throwable
StackMap stack:
aload 1
aload 0
getfield io.reactivex.subjects.SingleSubject.value:Ljava/lang/Object;
invokeinterface io.reactivex.SingleObserver.onSuccess:(Ljava/lang/Object;)V
end local 3 11: StackMap locals:
StackMap stack:
return
end local 2 end local 1 end local 0 LocalVariableTable:
Start End Slot Name Signature
0 12 0 this Lio/reactivex/subjects/SingleSubject<TT;>;
0 12 1 observer Lio/reactivex/SingleObserver<-TT;>;
1 12 2 md Lio/reactivex/subjects/SingleSubject$SingleDisposable<TT;>;
7 11 3 ex Ljava/lang/Throwable;
Signature: (Lio/reactivex/SingleObserver<-TT;>;)V
RuntimeInvisibleParameterAnnotations:
0:
io.reactivex.annotations.NonNull()
MethodParameters:
Name Flags
observer
boolean add(io.reactivex.subjects.SingleSubject$SingleDisposable<T>);
descriptor: (Lio/reactivex/subjects/SingleSubject$SingleDisposable;)Z
flags: (0x0000)
Code:
stack=5, locals=5, args_size=2
start local 0 start local 1 0: StackMap locals:
StackMap stack:
aload 0
getfield io.reactivex.subjects.SingleSubject.observers:Ljava/util/concurrent/atomic/AtomicReference;
invokevirtual java.util.concurrent.atomic.AtomicReference.get:()Ljava/lang/Object;
checkcast io.reactivex.subjects.SingleSubject$SingleDisposable[]
astore 2
start local 2 1: aload 2
getstatic io.reactivex.subjects.SingleSubject.TERMINATED:[Lio/reactivex/subjects/SingleSubject$SingleDisposable;
if_acmpne 3
2: iconst_0
ireturn
3: StackMap locals: io.reactivex.subjects.SingleSubject$SingleDisposable[]
StackMap stack:
aload 2
arraylength
istore 3
start local 3 4: iload 3
iconst_1
iadd
anewarray io.reactivex.subjects.SingleSubject$SingleDisposable
astore 4
start local 4 5: aload 2
iconst_0
aload 4
iconst_0
iload 3
invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
6: aload 4
iload 3
aload 1
aastore
7: aload 0
getfield io.reactivex.subjects.SingleSubject.observers:Ljava/util/concurrent/atomic/AtomicReference;
aload 2
aload 4
invokevirtual java.util.concurrent.atomic.AtomicReference.compareAndSet:(Ljava/lang/Object;Ljava/lang/Object;)Z
ifeq 0
8: iconst_1
ireturn
end local 4 end local 3 end local 2 end local 1 end local 0 LocalVariableTable:
Start End Slot Name Signature
0 9 0 this Lio/reactivex/subjects/SingleSubject<TT;>;
0 9 1 inner Lio/reactivex/subjects/SingleSubject$SingleDisposable<TT;>;
1 9 2 a [Lio/reactivex/subjects/SingleSubject$SingleDisposable;
4 9 3 n I
5 9 4 b [Lio/reactivex/subjects/SingleSubject$SingleDisposable;
Signature: (Lio/reactivex/subjects/SingleSubject$SingleDisposable<TT;>;)Z
RuntimeInvisibleParameterAnnotations:
0:
io.reactivex.annotations.NonNull()
MethodParameters:
Name Flags
inner
void remove(io.reactivex.subjects.SingleSubject$SingleDisposable<T>);
descriptor: (Lio/reactivex/subjects/SingleSubject$SingleDisposable;)V
flags: (0x0000)
Code:
stack=6, locals=6, args_size=2
start local 0 start local 1 0: StackMap locals:
StackMap stack:
aload 0
getfield io.reactivex.subjects.SingleSubject.observers:Ljava/util/concurrent/atomic/AtomicReference;
invokevirtual java.util.concurrent.atomic.AtomicReference.get:()Ljava/lang/Object;
checkcast io.reactivex.subjects.SingleSubject$SingleDisposable[]
astore 2
start local 2 1: aload 2
arraylength
istore 3
start local 3 2: iload 3
ifne 4
3: return
4: StackMap locals: io.reactivex.subjects.SingleSubject$SingleDisposable[] int
StackMap stack:
iconst_m1
istore 4
start local 4 5: iconst_0
istore 5
start local 5 6: goto 11
7: StackMap locals: int int
StackMap stack:
aload 2
iload 5
aaload
aload 1
if_acmpne 10
8: iload 5
istore 4
9: goto 12
10: StackMap locals:
StackMap stack:
iinc 5 1
StackMap locals:
StackMap stack:
11: iload 5
iload 3
if_icmplt 7
end local 5 12: StackMap locals:
StackMap stack:
iload 4
ifge 14
13: return
14: StackMap locals:
StackMap stack:
iload 3
iconst_1
if_icmpne 17
15: getstatic io.reactivex.subjects.SingleSubject.EMPTY:[Lio/reactivex/subjects/SingleSubject$SingleDisposable;
astore 5
start local 5 16: goto 20
end local 5 17: StackMap locals:
StackMap stack:
iload 3
iconst_1
isub
anewarray io.reactivex.subjects.SingleSubject$SingleDisposable
astore 5
start local 5 18: aload 2
iconst_0
aload 5
iconst_0
iload 4
invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
19: aload 2
iload 4
iconst_1
iadd
aload 5
iload 4
iload 3
iload 4
isub
iconst_1
isub
invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
20: StackMap locals: io.reactivex.subjects.SingleSubject$SingleDisposable[]
StackMap stack:
aload 0
getfield io.reactivex.subjects.SingleSubject.observers:Ljava/util/concurrent/atomic/AtomicReference;
aload 2
aload 5
invokevirtual java.util.concurrent.atomic.AtomicReference.compareAndSet:(Ljava/lang/Object;Ljava/lang/Object;)Z
ifeq 0
21: return
end local 5 end local 4 end local 3 end local 2 end local 1 end local 0 LocalVariableTable:
Start End Slot Name Signature
0 22 0 this Lio/reactivex/subjects/SingleSubject<TT;>;
0 22 1 inner Lio/reactivex/subjects/SingleSubject$SingleDisposable<TT;>;
1 22 2 a [Lio/reactivex/subjects/SingleSubject$SingleDisposable;
2 22 3 n I
5 22 4 j I
6 12 5 i I
16 17 5 b [Lio/reactivex/subjects/SingleSubject$SingleDisposable;
18 22 5 b [Lio/reactivex/subjects/SingleSubject$SingleDisposable;
Signature: (Lio/reactivex/subjects/SingleSubject$SingleDisposable<TT;>;)V
RuntimeInvisibleParameterAnnotations:
0:
io.reactivex.annotations.NonNull()
MethodParameters:
Name Flags
inner
public T getValue();
descriptor: ()Ljava/lang/Object;
flags: (0x0001) ACC_PUBLIC
Code:
stack=2, locals=1, args_size=1
start local 0 0: aload 0
getfield io.reactivex.subjects.SingleSubject.observers:Ljava/util/concurrent/atomic/AtomicReference;
invokevirtual java.util.concurrent.atomic.AtomicReference.get:()Ljava/lang/Object;
getstatic io.reactivex.subjects.SingleSubject.TERMINATED:[Lio/reactivex/subjects/SingleSubject$SingleDisposable;
if_acmpne 2
1: aload 0
getfield io.reactivex.subjects.SingleSubject.value:Ljava/lang/Object;
areturn
2: StackMap locals:
StackMap stack:
aconst_null
areturn
end local 0 LocalVariableTable:
Start End Slot Name Signature
0 3 0 this Lio/reactivex/subjects/SingleSubject<TT;>;
Signature: ()TT;
RuntimeInvisibleAnnotations:
io.reactivex.annotations.Nullable()
public boolean hasValue();
descriptor: ()Z
flags: (0x0001) ACC_PUBLIC
Code:
stack=2, locals=1, args_size=1
start local 0 0: aload 0
getfield io.reactivex.subjects.SingleSubject.observers:Ljava/util/concurrent/atomic/AtomicReference;
invokevirtual java.util.concurrent.atomic.AtomicReference.get:()Ljava/lang/Object;
getstatic io.reactivex.subjects.SingleSubject.TERMINATED:[Lio/reactivex/subjects/SingleSubject$SingleDisposable;
if_acmpne 1
aload 0
getfield io.reactivex.subjects.SingleSubject.value:Ljava/lang/Object;
ifnull 1
iconst_1
ireturn
StackMap locals:
StackMap stack:
1: iconst_0
ireturn
end local 0 LocalVariableTable:
Start End Slot Name Signature
0 2 0 this Lio/reactivex/subjects/SingleSubject<TT;>;
public java.lang.Throwable getThrowable();
descriptor: ()Ljava/lang/Throwable;
flags: (0x0001) ACC_PUBLIC
Code:
stack=2, locals=1, args_size=1
start local 0 0: aload 0
getfield io.reactivex.subjects.SingleSubject.observers:Ljava/util/concurrent/atomic/AtomicReference;
invokevirtual java.util.concurrent.atomic.AtomicReference.get:()Ljava/lang/Object;
getstatic io.reactivex.subjects.SingleSubject.TERMINATED:[Lio/reactivex/subjects/SingleSubject$SingleDisposable;
if_acmpne 2
1: aload 0
getfield io.reactivex.subjects.SingleSubject.error:Ljava/lang/Throwable;
areturn
2: StackMap locals:
StackMap stack:
aconst_null
areturn
end local 0 LocalVariableTable:
Start End Slot Name Signature
0 3 0 this Lio/reactivex/subjects/SingleSubject<TT;>;
RuntimeInvisibleAnnotations:
io.reactivex.annotations.Nullable()
public boolean hasThrowable();
descriptor: ()Z
flags: (0x0001) ACC_PUBLIC
Code:
stack=2, locals=1, args_size=1
start local 0 0: aload 0
getfield io.reactivex.subjects.SingleSubject.observers:Ljava/util/concurrent/atomic/AtomicReference;
invokevirtual java.util.concurrent.atomic.AtomicReference.get:()Ljava/lang/Object;
getstatic io.reactivex.subjects.SingleSubject.TERMINATED:[Lio/reactivex/subjects/SingleSubject$SingleDisposable;
if_acmpne 1
aload 0
getfield io.reactivex.subjects.SingleSubject.error:Ljava/lang/Throwable;
ifnull 1
iconst_1
ireturn
StackMap locals:
StackMap stack:
1: iconst_0
ireturn
end local 0 LocalVariableTable:
Start End Slot Name Signature
0 2 0 this Lio/reactivex/subjects/SingleSubject<TT;>;
public boolean hasObservers();
descriptor: ()Z
flags: (0x0001) ACC_PUBLIC
Code:
stack=1, locals=1, args_size=1
start local 0 0: aload 0
getfield io.reactivex.subjects.SingleSubject.observers:Ljava/util/concurrent/atomic/AtomicReference;
invokevirtual java.util.concurrent.atomic.AtomicReference.get:()Ljava/lang/Object;
checkcast io.reactivex.subjects.SingleSubject$SingleDisposable[]
arraylength
ifeq 1
iconst_1
ireturn
StackMap locals:
StackMap stack:
1: iconst_0
ireturn
end local 0 LocalVariableTable:
Start End Slot Name Signature
0 2 0 this Lio/reactivex/subjects/SingleSubject<TT;>;
int observerCount();
descriptor: ()I
flags: (0x0000)
Code:
stack=1, locals=1, args_size=1
start local 0 0: aload 0
getfield io.reactivex.subjects.SingleSubject.observers:Ljava/util/concurrent/atomic/AtomicReference;
invokevirtual java.util.concurrent.atomic.AtomicReference.get:()Ljava/lang/Object;
checkcast io.reactivex.subjects.SingleSubject$SingleDisposable[]
arraylength
ireturn
end local 0 LocalVariableTable:
Start End Slot Name Signature
0 1 0 this Lio/reactivex/subjects/SingleSubject<TT;>;
}
Signature: <T:Ljava/lang/Object;>Lio/reactivex/Single<TT;>;Lio/reactivex/SingleObserver<TT;>;
SourceFile: "SingleSubject.java"
NestMembers:
io.reactivex.subjects.SingleSubject$SingleDisposable
InnerClasses:
final SingleDisposable = io.reactivex.subjects.SingleSubject$SingleDisposable of io.reactivex.subjects.SingleSubject