javolution.context.internal.LocalContextImpl Class Reference

Inheritance diagram for javolution.context.internal.LocalContextImpl:

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Public Member Functions
void	exit ()

Static Public Member Functions
static LocalContext	enter ()
static< T extends AbstractContext > T	enter (Class< T > custom)
static AbstractContext	current ()
static void	inherit (AbstractContext ctx)

Protected Member Functions
LocalContext	inner ()
AbstractContext	enterInner ()
AbstractContext	getOuter ()

Static Protected Member Functions
static< T extends AbstractContext > T	current (Class< T > type)

Package Functions
public< T > void	supersede (Parameter< T > param, T localValue)
protected< T > T	getValue (Parameter< T > param, T defaultValue)

Private Attributes
FastMap< Parameter<?>, Object >	localSettings = new FastMap<Parameter<?>, Object>()
LocalContextImpl	parent
AbstractContext	outer

Static Private Attributes
static final ThreadLocal< AbstractContext >	CURRENT = new ThreadLocal<AbstractContext>()

Detailed Description

Holds the default implementation of LocalContext.

Definition at line 17 of file LocalContextImpl.java.

Member Function Documentation

current() [1/2]

static AbstractContext javolution.context.AbstractContext.current ( )

staticinherited

Returns the current context for the current thread or

null 

if this thread has no context (default).

Definition at line 61 of file AbstractContext.java.

                                            {
        return AbstractContext.CURRENT.get();
    }

References javolution.context.AbstractContext.CURRENT.

Referenced by javolution.context.LogContext.currentLogContext(), javolution.context.SecurityContext.currentSecurityContext(), javolution.text.TextContext.currentTextContext(), javolution.xml.XMLContext.currentXMLContext(), javolution.context.LocalContext.enter(), javolution.context.ConcurrentContext.enter(), and javolution.context.LocalContext.Parameter< T >.get().

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current() [2/2]

static <T extends AbstractContext> T javolution.context.AbstractContext.current ( Class< T >  type )

staticprotectedinherited

Returns the current context of specified type or

null 

if none.

Definition at line 69 of file AbstractContext.java.

                                                                          {
        AbstractContext ctx = AbstractContext.CURRENT.get();
        while (ctx != null) {
            if (type.isInstance(ctx))
                return (T) ctx;
            ctx = ctx.outer;
        }
        return null;
    }

References javolution.context.AbstractContext.CURRENT, and javolution.context.AbstractContext.outer.

enter() [1/2]

static LocalContext javolution.context.LocalContext.enter ( )

staticinherited

Enters and returns a new local context instance.

Definition at line 97 of file LocalContext.java.

                                       {
        LocalContext ctx = current(LocalContext.class);
        if (ctx == null) { // Root.
            ctx = OSGiServices.getLocalContext();
        }
        return (LocalContext) ctx.enterInner();
    }

References javolution.context.AbstractContext.current(), javolution.context.AbstractContext.enterInner(), and javolution.osgi.internal.OSGiServices.getLocalContext().

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enter() [2/2]

static <T extends AbstractContext> T javolution.context.AbstractContext.enter ( Class< T >  custom )

staticinherited

Enters the scope of a custom context. This method raises a SecurityException if the permission to enter contexts of the specified class is not granted. For example, the following disallow entering any custom context. [code] SecurityContext ctx = SecurityContext.enter(); try { ctx.revoke(new SecurityContext.Permission(AbstractContext.class, "enter")); ... // Cannot enter any custom context. } finally { ctx.exit(); // Back to previous security settings. }[/code]

Parameters

custom

the custom context to enter.

Exceptions

IllegalArgumentException	if the specified class default constructor cannot be instantiated.
SecurityException	if SecurityContext.Permission(custom, "enter") is not granted.

See also

SecurityContext.Permission

Definition at line 101 of file AbstractContext.java.

                                                                       {
        SecurityContext.check(new Permission<T>(custom, "enter"));
        try {
            return (T) custom.newInstance().enterInner();
        } catch (InstantiationException e) {
            throw new IllegalArgumentException(
                    "Cannot instantiate instance of " + custom, e);
        } catch (IllegalAccessException e) {
            throw new IllegalArgumentException("Cannot access " + custom, e);
        }
    }

References javolution.context.SecurityContext.check().

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enterInner()

AbstractContext javolution.context.AbstractContext.enterInner ( )

protectedinherited

Enters the scope of an inner context which becomes the current context; the previous current context becomes the outer of this context.

Returns

the inner context entered.

Definition at line 141 of file AbstractContext.java.

                                           {
        AbstractContext inner = inner();
        inner.outer = AbstractContext.CURRENT.get();
        AbstractContext.CURRENT.set(inner);
        return inner;
    }

References javolution.context.AbstractContext.CURRENT, and javolution.context.AbstractContext.outer.

Referenced by javolution.xml.XMLContext.enter(), javolution.text.TextContext.enter(), javolution.context.LogContext.enter(), javolution.context.LocalContext.enter(), javolution.context.SecurityContext.enter(), and javolution.context.ConcurrentContext.enter().

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exit()

void javolution.context.AbstractContext.exit ( )

inherited

Exits the scope of this context; the outer of this context becomes
the current context.

Exceptions

IllegalStateException

if this context is not the current context.

Reimplemented in javolution.context.ConcurrentContext, and javolution.context.internal.ConcurrentContextImpl.

Definition at line 155 of file AbstractContext.java.

                       {
        if (this != AbstractContext.CURRENT.get())
            throw new IllegalStateException(
                    "This context is not the current context");
        AbstractContext.CURRENT.set(outer);
        outer = null;
    }

References javolution.context.AbstractContext.CURRENT.

getOuter()

AbstractContext javolution.context.AbstractContext.getOuter ( )

protectedinherited

Returns the outer context of this context or

null 

if this context has no outer context.

Definition at line 167 of file AbstractContext.java.

                                         {
        return outer;
    }

getValue()

protected<T> T javolution.context.internal.LocalContextImpl.getValue ( Parameter< T >  param, T  defaultValue  )

package

Returns the local value of the specified parameter or the specified default value if not superseded.

Parameters

param	the local parameter whose local value is returned.
defaultValue	the parameter value if not superseded.

Reimplemented from javolution.context.LocalContext.

Definition at line 37 of file LocalContextImpl.java.

                                                                 {
        Object value = localSettings.get(param);
        if (value != null) return (T) value;
        if (parent != null) return parent.getValue(param, defaultValue);
        return defaultValue;
    }

References javolution.util.FastMap< K, V >.get(), javolution.context.internal.LocalContextImpl.getValue(), javolution.context.internal.LocalContextImpl.localSettings, and javolution.context.internal.LocalContextImpl.parent.

Referenced by javolution.context.internal.LocalContextImpl.getValue().

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inherit()

static void javolution.context.AbstractContext.inherit ( AbstractContext  ctx )

staticinherited

Inherits the specified context which becomes the context of the current thread. This method is particularly useful when creating new threads to make them inherits from the context stack of the parent thread. [code] //Spawns a new thread inheriting the context of the current thread. MyThread myThread = new MyThread(); myThread.inherited = AbstractContext.current(); myThread.start(); ... class MyThread extends Thread { AbstractContext inherited; public void run() { AbstractContext.inherit(inherited); // Sets current context. ... } }[/code]

Definition at line 131 of file AbstractContext.java.

                                                    {
        CURRENT.set(ctx);
    }

Referenced by javolution.context.internal.ConcurrentThreadImpl.run().

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inner()

LocalContext javolution.context.internal.LocalContextImpl.inner ( )

protected

Returns a new inner instance of this context inheriting the properties of this context. The new instance can be configured independently from its parent.

Reimplemented from javolution.context.AbstractContext.

Definition at line 23 of file LocalContextImpl.java.

                                   {
        LocalContextImpl ctx = new LocalContextImpl();
        ctx.parent = this;
        return ctx;
    }

References javolution.context.internal.LocalContextImpl.parent.

supersede()

public<T> void javolution.context.internal.LocalContextImpl.supersede ( Parameter< T >  param, T  localValue  )

package

Supersedes the value of the specified parameter.

Parameters

param	the local parameter whose local value is overridden.
localValue	the new local value.

Exceptions

SecurityException	if the permission to override the specified parameter is not granted.
NullPointerException	if the specified local value is null .

Reimplemented from javolution.context.LocalContext.

Definition at line 30 of file LocalContextImpl.java.

                                                                {
        if (localValue == null) throw new NullPointerException();
        localSettings.put(param, localValue);
    }

References javolution.context.internal.LocalContextImpl.localSettings, and javolution.util.FastMap< K, V >.put().

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Member Data Documentation

CURRENT

final ThreadLocal<AbstractContext> javolution.context.AbstractContext.CURRENT = new ThreadLocal<AbstractContext>()

staticprivateinherited

Holds the last context entered (thread-local).

Definition at line 45 of file AbstractContext.java.

Referenced by javolution.context.AbstractContext.current(), javolution.context.AbstractContext.enterInner(), and javolution.context.AbstractContext.exit().

localSettings

FastMap<Parameter<?>, Object> javolution.context.internal.LocalContextImpl.localSettings = new FastMap<Parameter<?>, Object>()

private

Definition at line 19 of file LocalContextImpl.java.

Referenced by javolution.context.internal.LocalContextImpl.getValue(), and javolution.context.internal.LocalContextImpl.supersede().

outer

AbstractContext javolution.context.AbstractContext.outer

privateinherited

Holds the outer context or

null 

if none (top context).

Definition at line 50 of file AbstractContext.java.

Referenced by javolution.context.AbstractContext.current(), and javolution.context.AbstractContext.enterInner().

parent

LocalContextImpl javolution.context.internal.LocalContextImpl.parent

private

Definition at line 20 of file LocalContextImpl.java.

Referenced by javolution.context.internal.LocalContextImpl.getValue(), and javolution.context.internal.LocalContextImpl.inner().

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The documentation for this class was generated from the following file:

• LocalContextImpl.java