A new Binding is created for every script execution so thread safety is not a 
problem.

Ralph

> On Sep 14, 2016, at 4:09 PM, Remko Popma <[email protected]> wrote:
> 
> If the Binding is shared between threads (and therefore not thread-safe), you 
> could put the LogEvent in a ThreadLocal. 
> 
> Sent from my iPhone
> 
> On 2016/09/15, at 6:24, Gary Gregory <[email protected] 
> <mailto:[email protected]>> wrote:
> 
>> Ralph: Thank you for the guidance on this topic.
>> 
>> I'll tackle the documentation update tonight. 
>> 
>> WRT Lookups, that's YAGNI for me ATM. If you have a solution path on that, I 
>> can take a look.
>> 
>> I am wondering in general about the performance difference from an app POV 
>> between a plain appender and one appender nested in a RoutingAppender.
>> 
>> I am also wondering about any concurrency issue passing a LogEvent to a 
>> Script. Can a LogEvent be skipped when multiple threads use the same 
>> RoutingAppender?
>> 
>> Gary
>> 
>> On Wed, Sep 14, 2016 at 12:50 PM, Ralph Goers <[email protected] 
>> <mailto:[email protected]>> wrote:
>> Sounds good.
>> 
>> When documenting that you should make it clear that the Map is shared so 
>> that every thread is seeing the same Map. Users need to be aware that they 
>> cannot put things in the map and expect it to only be available for that 
>> single event.
>> 
>> The last, and probably trickiest part, is going to be making it so variables 
>> in the Map can be accessed via a Lookup. To be honest, I haven’t really 
>> figured out how to do that.
>> 
>> Ralph
>> 
>>> On Sep 14, 2016, at 12:34 PM, Gary Gregory <[email protected] 
>>> <mailto:[email protected]>> wrote:
>>> 
>>> The RoutingAppender Scripts now share a Bindings instance which contains a 
>>> ConcurrentMap keyed under "staticVariables". The Bindings instance is 
>>> tracked as a RoutingAppender and Routes ivar.
>>> 
>>> I created an abstract superclass for (private) ScriptRunner implementations 
>>> which holds on to the ConcurrentMap. The map can act as a set of 
>>> static/global variables for that script and can be shared through a 
>>> Bindings instance. The private ScriptRunner has new method 
>>> ScriptManager.ScriptRunner.createBindings(). Right now there is no script 
>>> specific data added to the Bindings, but there could be in the future.
>>> 
>>> I'll add LogEvent support next...
>>> 
>>> Gary
>>> 
>>> On Wed, Sep 14, 2016 at 6:42 AM, Ralph Goers <[email protected] 
>>> <mailto:[email protected]>> wrote:
>>> OK - It wasn’t in there when I looked last night.
>>> 
>>> A couple other things. A ConcurrentMap should be created and passed to the 
>>> init script and the routing script so that the init script can pass 
>>> variables to the routing script. Also, the routing script really needs to 
>>> be passed the logEvent so it can route based on data within it.
>>> 
>>> Ralph
>>> 
>>>> On Sep 13, 2016, at 10:49 PM, Gary Gregory <[email protected] 
>>>> <mailto:[email protected]>> wrote:
>>>> 
>>>> On Tue, Sep 13, 2016 at 10:33 PM, Ralph Goers <[email protected] 
>>>> <mailto:[email protected]>> wrote:
>>>> Gary,
>>>> 
>>>> RoutingAppender calls routes.getPattern().  Wouldn’t it make sense for the 
>>>> Routes class to execute the script in the call to getPattern and return 
>>>> the result if there is a script?
>>>> 
>>>> That's what Routes.getPattern() does (see this very commit thread):
>>>> 
>>>> @@ -90,12 +155,26 @@ public final class Routes {
>>>>       * @return the pattern.
>>>>       */
>>>>      public String getPattern() {
>>>> +        if (patternScript != null) {
>>>> +            final SimpleBindings bindings = new SimpleBindings();
>>>> +            bindings.put("configuration", configuration);
>>>> +            bindings.put("statusLogger", LOGGER);
>>>> +            final Object object = 
>>>> configuration.getScriptManager().execute(patternScript.getName(), 
>>>> bindings);
>>>> +            return Objects.toString(object, null);
>>>> +        }
>>>>          return pattern;
>>>>      }
>>>> 
>>>> Gary
>>>>  
>>>> 
>>>> Ralph
>>>> 
>>>> > On Sep 13, 2016, at 10:00 PM, [email protected] 
>>>> > <mailto:[email protected]> wrote:
>>>> >
>>>> > Repository: logging-log4j2
>>>> > Updated Branches:
>>>> >  refs/heads/master 3846e2a87 -> e0f29d9ad
>>>> >
>>>> >
>>>> > [LOG4J2-1578] RoutingAppender can be configured with scripts. Add Script
>>>> > in a Routes element.
>>>> >
>>>> > Project: http://git-wip-us.apache.org/repos/asf/logging-log4j2/repo 
>>>> > <http://git-wip-us.apache.org/repos/asf/logging-log4j2/repo>
>>>> > Commit: 
>>>> > http://git-wip-us.apache.org/repos/asf/logging-log4j2/commit/e0f29d9a 
>>>> > <http://git-wip-us.apache.org/repos/asf/logging-log4j2/commit/e0f29d9a>
>>>> > Tree: 
>>>> > http://git-wip-us.apache.org/repos/asf/logging-log4j2/tree/e0f29d9a 
>>>> > <http://git-wip-us.apache.org/repos/asf/logging-log4j2/tree/e0f29d9a>
>>>> > Diff: 
>>>> > http://git-wip-us.apache.org/repos/asf/logging-log4j2/diff/e0f29d9a 
>>>> > <http://git-wip-us.apache.org/repos/asf/logging-log4j2/diff/e0f29d9a>
>>>> >
>>>> > Branch: refs/heads/master
>>>> > Commit: e0f29d9ad73aa4579cdc2d71ae5e8c01dd4f9f9c
>>>> > Parents: 3846e2a
>>>> > Author: Gary Gregory <[email protected] <mailto:[email protected]>>
>>>> > Authored: Tue Sep 13 21:59:59 2016 -0700
>>>> > Committer: Gary Gregory <[email protected] 
>>>> > <mailto:[email protected]>>
>>>> > Committed: Tue Sep 13 21:59:59 2016 -0700
>>>> >
>>>> > ----------------------------------------------------------------------
>>>> > .../log4j/core/appender/routing/Routes.java     | 121 ++++++++++++-----
>>>> > .../core/appender/routing/RoutingAppender.java  |  19 ++-
>>>> > .../routing/RoutesScriptAppenderTest.java       | 130 +++++++++++++++++++
>>>> > .../log4j-routing-routes-script-groovy.xml      |  43 ++++++
>>>> > .../log4j-routing-routes-script-javascript.xml  |  40 ++++++
>>>> > src/site/xdoc/manual/appenders.xml              |  27 +++-
>>>> > 6 files changed, 340 insertions(+), 40 deletions(-)
>>>> > ----------------------------------------------------------------------
>>>> >
>>>> >
>>>> > http://git-wip-us.apache.org/repos/asf/logging-log4j2/blob/e0f29d9a/log4j-core/src/main/java/org/apache/logging/log4j/core/appender/routing/Routes.java
>>>> >  
>>>> > <http://git-wip-us.apache.org/repos/asf/logging-log4j2/blob/e0f29d9a/log4j-core/src/main/java/org/apache/logging/log4j/core/appender/routing/Routes.java>
>>>> > ----------------------------------------------------------------------
>>>> > diff --git 
>>>> > a/log4j-core/src/main/java/org/apache/logging/log4j/core/appender/routing/Routes.java
>>>> >  
>>>> > b/log4j-core/src/main/java/org/apache/logging/log4j/core/appender/routing/Routes.java
>>>> > index c95b64a..33fccd7 100644
>>>> > --- 
>>>> > a/log4j-core/src/main/java/org/apache/logging/log4j/core/appender/routing/Routes.java
>>>> > +++ 
>>>> > b/log4j-core/src/main/java/org/apache/logging/log4j/core/appender/routing/Routes.java
>>>> > @@ -18,11 +18,17 @@ package 
>>>> > org.apache.logging.log4j.core.appender.routing;
>>>> >
>>>> > import java.util.Objects;
>>>> >
>>>> > +import javax.script.SimpleBindings;
>>>> > +
>>>> > import org.apache.logging.log4j.Logger;
>>>> > +import org.apache.logging.log4j.core.config.Configuration;
>>>> > import org.apache.logging.log4j.core.config.plugins.Plugin;
>>>> > import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
>>>> > import org.apache.logging.log4j.core.config.plugins.PluginBuilderFactory;
>>>> > +import org.apache.logging.log4j.core.config.plugins.PluginConfiguration;
>>>> > import org.apache.logging.log4j.core.config.plugins.PluginElement;
>>>> > +import 
>>>> > org.apache.logging.log4j.core.config.plugins.validation.constraints.Required;
>>>> > +import org.apache.logging.log4j.core.script.AbstractScript;
>>>> > import org.apache.logging.log4j.status.StatusLogger;
>>>> >
>>>> > /**
>>>> > @@ -33,54 +39,113 @@ public final class Routes {
>>>> >
>>>> >     public static class Builder implements 
>>>> > org.apache.logging.log4j.core.util.Builder<Routes>  {
>>>> >
>>>> > +        @PluginConfiguration
>>>> > +        private Configuration configuration;
>>>> > +
>>>> >         @PluginAttribute("pattern")
>>>> >         private String pattern;
>>>> >
>>>> > -        @PluginElement("Routes")
>>>> > +        @PluginElement("Script")
>>>> > +        private AbstractScript patternScript;
>>>> > +
>>>> > +        @PluginElement("Routes")
>>>> > +        @Required
>>>> >         private Route[] routes;
>>>> >
>>>> >         @Override
>>>> >         public Routes build() {
>>>> >             if (routes == null || routes.length == 0) {
>>>> > -                LOGGER.error("No routes configured");
>>>> > +                LOGGER.error("No Routes configured.");
>>>> >                 return null;
>>>> >             }
>>>> > -            return new Routes(pattern, routes);
>>>> > +            if (patternScript != null && pattern != null) {
>>>> > +                LOGGER.warn("In a Routes element, you must configure 
>>>> > either a Script element or a pattern attribute.");
>>>> > +            }
>>>> > +            if (patternScript != null) {
>>>> > +                if (configuration == null) {
>>>> > +                    LOGGER.error("No Configuration defined for Routes; 
>>>> > required for Script");
>>>> > +                } else {
>>>> > +                    
>>>> > configuration.getScriptManager().addScript(patternScript);
>>>> > +                }
>>>> > +            }
>>>> > +            return new Routes(configuration, patternScript, pattern, 
>>>> > routes);
>>>> > +        }
>>>> > +
>>>> > +        public Configuration getConfiguration() {
>>>> > +            return configuration;
>>>> >         }
>>>> >
>>>> >         public String getPattern() {
>>>> >             return pattern;
>>>> >         }
>>>> >
>>>> > +        public AbstractScript getPatternScript() {
>>>> > +            return patternScript;
>>>> > +        }
>>>> > +
>>>> >         public Route[] getRoutes() {
>>>> >             return routes;
>>>> >         }
>>>> >
>>>> > -        public Builder withPattern(@SuppressWarnings("hiding") String 
>>>> > pattern) {
>>>> > +        public Builder withConfiguration(@SuppressWarnings("hiding") 
>>>> > final Configuration configuration) {
>>>> > +            this.configuration = configuration;
>>>> > +            return this;
>>>> > +        }
>>>> > +
>>>> > +        public Builder withPattern(@SuppressWarnings("hiding") final 
>>>> > String pattern) {
>>>> >             this.pattern = pattern;
>>>> >             return this;
>>>> >         }
>>>> >
>>>> > -        public Builder withRoutes(@SuppressWarnings("hiding") Route[] 
>>>> > routes) {
>>>> > +        public Builder withPatternScript(@SuppressWarnings("hiding") 
>>>> > final AbstractScript patternScript) {
>>>> > +            this.patternScript = patternScript;
>>>> > +            return this;
>>>> > +        }
>>>> > +
>>>> > +        public Builder withRoutes(@SuppressWarnings("hiding") final 
>>>> > Route[] routes) {
>>>> >             this.routes = routes;
>>>> >             return this;
>>>> >         }
>>>> >
>>>> >     }
>>>> >
>>>> > +    private static final Logger LOGGER = StatusLogger.getLogger();
>>>> > +
>>>> > +    /**
>>>> > +     * Creates the Routes.
>>>> > +     * @param pattern The pattern.
>>>> > +     * @param routes An array of Route elements.
>>>> > +     * @return The Routes container.
>>>> > +     * @deprecated since 2.7; use {@link #newBuilder()}.
>>>> > +     */
>>>> > +    @Deprecated
>>>> > +    public static Routes createRoutes(
>>>> > +            final String pattern,
>>>> > +            final Route... routes) {
>>>> > +        if (routes == null || routes.length == 0) {
>>>> > +            LOGGER.error("No routes configured");
>>>> > +            return null;
>>>> > +        }
>>>> > +        return new Routes(null, null, pattern, routes);
>>>> > +    }
>>>> > +
>>>> >     @PluginBuilderFactory
>>>> >     public static Builder newBuilder() {
>>>> >         return new Builder();
>>>> >     }
>>>> > -
>>>> > -    private static final Logger LOGGER = StatusLogger.getLogger();
>>>> > -
>>>> > +
>>>> > +    private final Configuration configuration;
>>>> > +
>>>> >     private final String pattern;
>>>> >
>>>> > +    private final AbstractScript patternScript;
>>>> > +
>>>> >     // TODO Why not make this a Map or add a Map.
>>>> >     private final Route[] routes;
>>>> >
>>>> > -    private Routes(final String pattern, final Route... routes) {
>>>> > +    private Routes(final Configuration configuration, final 
>>>> > AbstractScript patternScript, final String pattern, final Route... 
>>>> > routes) {
>>>> > +        this.configuration = configuration;
>>>> > +        this.patternScript = patternScript;
>>>> >         this.pattern = pattern;
>>>> >         this.routes = routes;
>>>> >     }
>>>> > @@ -90,12 +155,26 @@ public final class Routes {
>>>> >      * @return the pattern.
>>>> >      */
>>>> >     public String getPattern() {
>>>> > +        if (patternScript != null) {
>>>> > +            final SimpleBindings bindings = new SimpleBindings();
>>>> > +            bindings.put("configuration", configuration);
>>>> > +            bindings.put("statusLogger", LOGGER);
>>>> > +            final Object object = 
>>>> > configuration.getScriptManager().execute(patternScript.getName(), 
>>>> > bindings);
>>>> > +            return Objects.toString(object, null);
>>>> > +        }
>>>> >         return pattern;
>>>> >     }
>>>> >
>>>> > -    public Route getRoute(String key) {
>>>> > -        for (int i = 0; i < routes.length; i++) {
>>>> > -            final Route route = routes[i];
>>>> > +    /**
>>>> > +     * Gets the optional script that decides which route to pick.
>>>> > +     * @return the optional script that decides which route to pick. 
>>>> > May be null.
>>>> > +     */
>>>> > +    public AbstractScript getPatternScript() {
>>>> > +        return patternScript;
>>>> > +    }
>>>> > +
>>>> > +    public Route getRoute(final String key) {
>>>> > +        for (final Route route : routes) {
>>>> >             if (Objects.equals(route.getKey(), key)) {
>>>> >                 return route;
>>>> >             }
>>>> > @@ -127,22 +206,4 @@ public final class Routes {
>>>> >
>>>> >     }
>>>> >
>>>> > -    /**
>>>> > -     * Creates the Routes.
>>>> > -     * @param pattern The pattern.
>>>> > -     * @param routes An array of Route elements.
>>>> > -     * @return The Routes container.
>>>> > -     * @deprecated since 2.7; use {@link #newBuilder()}.
>>>> > -     */
>>>> > -    @Deprecated
>>>> > -    public static Routes createRoutes(
>>>> > -            final String pattern,
>>>> > -            final Route... routes) {
>>>> > -        if (routes == null || routes.length == 0) {
>>>> > -            LOGGER.error("No routes configured");
>>>> > -            return null;
>>>> > -        }
>>>> > -        return new Routes(pattern, routes);
>>>> > -    }
>>>> > -
>>>> > }
>>>> >
>>>> > http://git-wip-us.apache.org/repos/asf/logging-log4j2/blob/e0f29d9a/log4j-core/src/main/java/org/apache/logging/log4j/core/appender/routing/RoutingAppender.java
>>>> >  
>>>> > <http://git-wip-us.apache.org/repos/asf/logging-log4j2/blob/e0f29d9a/log4j-core/src/main/java/org/apache/logging/log4j/core/appender/routing/RoutingAppender.java>
>>>> > ----------------------------------------------------------------------
>>>> > diff --git 
>>>> > a/log4j-core/src/main/java/org/apache/logging/log4j/core/appender/routing/RoutingAppender.java
>>>> >  
>>>> > b/log4j-core/src/main/java/org/apache/logging/log4j/core/appender/routing/RoutingAppender.java
>>>> > index 4471333..78fddbc 100644
>>>> > --- 
>>>> > a/log4j-core/src/main/java/org/apache/logging/log4j/core/appender/routing/RoutingAppender.java
>>>> > +++ 
>>>> > b/log4j-core/src/main/java/org/apache/logging/log4j/core/appender/routing/RoutingAppender.java
>>>> > @@ -72,15 +72,16 @@ public final class RoutingAppender extends 
>>>> > AbstractAppender {
>>>> >
>>>> >         @Override
>>>> >         public RoutingAppender build() {
>>>> > -            if (getName() == null) {
>>>> > -                LOGGER.error("No name defined for RoutingAppender");
>>>> > +            final String name = getName();
>>>> > +            if (name == null) {
>>>> > +                LOGGER.error("No name defined for this 
>>>> > RoutingAppender");
>>>> >                 return null;
>>>> >             }
>>>> >             if (routes == null) {
>>>> > -                LOGGER.error("No routes defined for RoutingAppender");
>>>> > +                LOGGER.error("No routes defined for RoutingAppender 
>>>> > {}", name);
>>>> >                 return null;
>>>> >             }
>>>> > -            return new RoutingAppender(getName(), getFilter(), 
>>>> > isIgnoreExceptions(), routes, rewritePolicy,
>>>> > +            return new RoutingAppender(name, getFilter(), 
>>>> > isIgnoreExceptions(), routes, rewritePolicy,
>>>> >                     configuration, purgePolicy, defaultRouteScript);
>>>> >         }
>>>> >
>>>> > @@ -173,7 +174,7 @@ public final class RoutingAppender extends 
>>>> > AbstractAppender {
>>>> >     public void start() {
>>>> >         if (defaultRouteScript != null) {
>>>> >             if (configuration == null) {
>>>> > -                error("No Configuration defined for RoutingAppender; 
>>>> > required for DefaultRouteScript");
>>>> > +                error("No Configuration defined for RoutingAppender; 
>>>> > required for Script element.");
>>>> >             } else {
>>>> >                 
>>>> > configuration.getScriptManager().addScript(defaultRouteScript);
>>>> >                 final SimpleBindings bindings = new SimpleBindings();
>>>> > @@ -352,4 +353,12 @@ public final class RoutingAppender extends 
>>>> > AbstractAppender {
>>>> >     public RewritePolicy getRewritePolicy() {
>>>> >         return rewritePolicy;
>>>> >     }
>>>> > +
>>>> > +    public Routes getRoutes() {
>>>> > +        return routes;
>>>> > +    }
>>>> > +
>>>> > +    public Configuration getConfiguration() {
>>>> > +        return configuration;
>>>> > +    }
>>>> > }
>>>> >
>>>> > http://git-wip-us.apache.org/repos/asf/logging-log4j2/blob/e0f29d9a/log4j-core/src/test/java/org/apache/logging/log4j/core/appender/routing/RoutesScriptAppenderTest.java
>>>> >  
>>>> > <http://git-wip-us.apache.org/repos/asf/logging-log4j2/blob/e0f29d9a/log4j-core/src/test/java/org/apache/logging/log4j/core/appender/routing/RoutesScriptAppenderTest.java>
>>>> > ----------------------------------------------------------------------
>>>> > diff --git 
>>>> > a/log4j-core/src/test/java/org/apache/logging/log4j/core/appender/routing/RoutesScriptAppenderTest.java
>>>> >  
>>>> > b/log4j-core/src/test/java/org/apache/logging/log4j/core/appender/routing/RoutesScriptAppenderTest.java
>>>> > new file mode 100644
>>>> > index 0000000..7d90f6b
>>>> > --- /dev/null
>>>> > +++ 
>>>> > b/log4j-core/src/test/java/org/apache/logging/log4j/core/appender/routing/RoutesScriptAppenderTest.java
>>>> > @@ -0,0 +1,130 @@
>>>> > +/*
>>>> > + * Licensed to the Apache Software Foundation (ASF) under one or more
>>>> > + * contributor license agreements. See the NOTICE file distributed with
>>>> > + * this work for additional information regarding copyright ownership.
>>>> > + * The ASF licenses this file to You under the Apache license, Version 
>>>> > 2.0
>>>> > + * (the "License"); you may not use this file except in compliance with
>>>> > + * the License. You may obtain a copy of the License at
>>>> > + *
>>>> > + *      http://www.apache.org/licenses/LICENSE-2.0 
>>>> > <http://www.apache.org/licenses/LICENSE-2.0>
>>>> > + *
>>>> > + * Unless required by applicable law or agreed to in writing, software
>>>> > + * distributed under the License is distributed on an "AS IS" BASIS,
>>>> > + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 
>>>> > implied.
>>>> > + * See the license for the specific language governing permissions and
>>>> > + * limitations under the license.
>>>> > + */
>>>> > +package org.apache.logging.log4j.core.appender.routing;
>>>> > +
>>>> > +import static org.junit.Assert.assertNotNull;
>>>> > +import static org.junit.Assert.assertTrue;
>>>> > +
>>>> > +import java.util.List;
>>>> > +import java.util.Map;
>>>> > +
>>>> > +import org.apache.logging.log4j.core.LogEvent;
>>>> > +import org.apache.logging.log4j.core.Logger;
>>>> > +import org.apache.logging.log4j.core.config.AppenderControl;
>>>> > +import org.apache.logging.log4j.junit.LoggerContextRule;
>>>> > +import org.apache.logging.log4j.test.appender.ListAppender;
>>>> > +import org.junit.Assert;
>>>> > +import org.junit.Rule;
>>>> > +import org.junit.Test;
>>>> > +import org.junit.runner.RunWith;
>>>> > +import org.junit.runners.Parameterized;
>>>> > +
>>>> > +/**
>>>> > + *
>>>> > + */
>>>> > +@RunWith(Parameterized.class)
>>>> > +public class RoutesScriptAppenderTest {
>>>> > +
>>>> > +    @Parameterized.Parameters(name = "{0}")
>>>> > +    public static String[] getParameters() {
>>>> > +        return new String[] {
>>>> > +                "log4j-routing-routes-script-groovy.xml",
>>>> > +                "log4j-routing-routes-script-javascript.xml" };
>>>> > +    }
>>>> > +
>>>> > +    @Rule
>>>> > +    public final LoggerContextRule loggerContextRule;
>>>> > +
>>>> > +    public RoutesScriptAppenderTest(final String configLocation) {
>>>> > +        this.loggerContextRule = new LoggerContextRule(configLocation);
>>>> > +    }
>>>> > +
>>>> > +    private ListAppender getListAppender() {
>>>> > +        final String key = "Service2";
>>>> > +        final RoutingAppender routingAppender = getRoutingAppender();
>>>> > +        Assert.assertTrue(routingAppender.isStarted());
>>>> > +        final Map<String, AppenderControl> appenders = 
>>>> > routingAppender.getAppenders();
>>>> > +        final AppenderControl appenderControl = appenders.get(key);
>>>> > +        assertNotNull("No appender control generated for '" + key + "'; 
>>>> > appenders = " + appenders, appenderControl);
>>>> > +        final ListAppender listAppender = (ListAppender) 
>>>> > appenderControl.getAppender();
>>>> > +        return listAppender;
>>>> > +    }
>>>> > +
>>>> > +    private RoutingAppender getRoutingAppender() {
>>>> > +        return loggerContextRule.getRequiredAppender("Routing", 
>>>> > RoutingAppender.class);
>>>> > +    }
>>>> > +
>>>> > +    private void logAndCheck() {
>>>> > +        final Logger logger = 
>>>> > loggerContextRule.getLogger(RoutesScriptAppenderTest.class);
>>>> > +        logger.error("Hello");
>>>> > +        final ListAppender listAppender = getListAppender();
>>>> > +        final List<LogEvent> list = listAppender.getEvents();
>>>> > +        assertNotNull("No events generated", list);
>>>> > +        assertTrue("Incorrect number of events. Expected 1, got " + 
>>>> > list.size(), list.size() == 1);
>>>> > +        logger.error("World");
>>>> > +        assertTrue("Incorrect number of events. Expected 2, got " + 
>>>> > list.size(), list.size() == 2);
>>>> > +    }
>>>> > +
>>>> > +    @Test(expected = AssertionError.class)
>>>> > +    public void testAppenderAbsence() {
>>>> > +        loggerContextRule.getListAppender("List1");
>>>> > +    }
>>>> > +
>>>> > +    @Test
>>>> > +    public void testListAppenderPresence() {
>>>> > +        // No appender until an event is routed, even thought we 
>>>> > initialized the default route on startup.
>>>> > +        Assert.assertNull("No appender control generated", 
>>>> > getRoutingAppender().getAppenders().get("Service2"));
>>>> > +    }
>>>> > +
>>>> > +    @Test
>>>> > +    public void testNoPurgePolicy() {
>>>> > +        // No PurgePolicy in this test
>>>> > +        Assert.assertNull("Unexpected PurgePolicy", 
>>>> > getRoutingAppender().getPurgePolicy());
>>>> > +    }
>>>> > +
>>>> > +    @Test
>>>> > +    public void testNoRewritePolicy() {
>>>> > +        // No RewritePolicy in this test
>>>> > +        Assert.assertNull("Unexpected RewritePolicy", 
>>>> > getRoutingAppender().getRewritePolicy());
>>>> > +    }
>>>> > +
>>>> > +    @Test
>>>> > +    public void testRoutingAppenderRoutes() {
>>>> > +        final RoutingAppender routingAppender = getRoutingAppender();
>>>> > +        Assert.assertNull(routingAppender.getDefaultRouteScript());
>>>> > +        Assert.assertNull(routingAppender.getDefaultRoute());
>>>> > +        final Routes routes = routingAppender.getRoutes();
>>>> > +        Assert.assertNotNull(routes);
>>>> > +        Assert.assertNotNull(routes.ge 
>>>> > <http://routes.ge/>tPatternScript());
>>>> > +        Assert.assertEquals("Service2", routes.getPattern());
>>>> > +    }
>>>> > +
>>>> > +    @Test
>>>> > +    public void testRoutingAppenderPresence() {
>>>> > +        getRoutingAppender();
>>>> > +    }
>>>> > +
>>>> > +    @Test
>>>> > +    public void testRoutingPresence1() {
>>>> > +        logAndCheck();
>>>> > +    }
>>>> > +
>>>> > +    @Test
>>>> > +    public void testRoutingPresence2() {
>>>> > +        logAndCheck();
>>>> > +    }
>>>> > +}
>>>> >
>>>> > http://git-wip-us.apache.org/repos/asf/logging-log4j2/blob/e0f29d9a/log4j-core/src/test/resources/log4j-routing-routes-script-groovy.xml
>>>> >  
>>>> > <http://git-wip-us.apache.org/repos/asf/logging-log4j2/blob/e0f29d9a/log4j-core/src/test/resources/log4j-routing-routes-script-groovy.xml>
>>>> > ----------------------------------------------------------------------
>>>> > diff --git 
>>>> > a/log4j-core/src/test/resources/log4j-routing-routes-script-groovy.xml 
>>>> > b/log4j-core/src/test/resources/log4j-routing-routes-script-groovy.xml
>>>> > new file mode 100644
>>>> > index 0000000..83121ea
>>>> > --- /dev/null
>>>> > +++ 
>>>> > b/log4j-core/src/test/resources/log4j-routing-routes-script-groovy.xml
>>>> > @@ -0,0 +1,43 @@
>>>> > +<?xml version="1.0" encoding="UTF-8"?>
>>>> > +<!--
>>>> > + Licensed to the Apache Software Foundation (ASF) under one or more
>>>> > + contributor license agreements.  See the NOTICE file distributed with
>>>> > + this work for additional information regarding copyright ownership.
>>>> > + The ASF licenses this file to You under the Apache License, Version 2.0
>>>> > + (the "License"); you may not use this file except in compliance with
>>>> > + the License.  You may obtain a copy of the License at
>>>> > +
>>>> > +      http://www.apache.org/licenses/LICENSE-2.0 
>>>> > <http://www.apache.org/licenses/LICENSE-2.0>
>>>> > +
>>>> > + Unless required by applicable law or agreed to in writing, software
>>>> > + distributed under the License is distributed on an "AS IS" BASIS,
>>>> > + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 
>>>> > implied.
>>>> > + See the License for the specific language governing permissions and
>>>> > + limitations under the License.
>>>> > +
>>>> > +-->
>>>> > +<Configuration status="WARN" name="RoutingTest">
>>>> > +  <Appenders>
>>>> > +    <Routing name="Routing">
>>>> > +      <Routes>
>>>> > +        <Script name="RoutingInit" language="groovy"><![CDATA[
>>>> > +          if ("OSNameFoo".contains("Foo")) {
>>>> > +            return "Service2";
>>>> > +          }
>>>> > +          return "Service1";]]>
>>>> > +        </Script>
>>>> > +        <Route key="Service1">
>>>> > +          <List name="List1" />
>>>> > +        </Route>
>>>> > +        <Route key="Service2">
>>>> > +          <List name="List2" />
>>>> > +        </Route>
>>>> > +      </Routes>
>>>> > +    </Routing>
>>>> > +  </Appenders>
>>>> > +  <Loggers>
>>>> > +    <Root level="error">
>>>> > +      <AppenderRef ref="Routing" />
>>>> > +    </Root>
>>>> > +  </Loggers>
>>>> > +</Configuration>
>>>> > \ No newline at end of file
>>>> >
>>>> > http://git-wip-us.apache.org/repos/asf/logging-log4j2/blob/e0f29d9a/log4j-core/src/test/resources/log4j-routing-routes-script-javascript.xml
>>>> >  
>>>> > <http://git-wip-us.apache.org/repos/asf/logging-log4j2/blob/e0f29d9a/log4j-core/src/test/resources/log4j-routing-routes-script-javascript.xml>
>>>> > ----------------------------------------------------------------------
>>>> > diff --git 
>>>> > a/log4j-core/src/test/resources/log4j-routing-routes-script-javascript.xml
>>>> >  
>>>> > b/log4j-core/src/test/resources/log4j-routing-routes-script-javascript.xml
>>>> > new file mode 100644
>>>> > index 0000000..e672aea
>>>> > --- /dev/null
>>>> > +++ 
>>>> > b/log4j-core/src/test/resources/log4j-routing-routes-script-javascript.xml
>>>> > @@ -0,0 +1,40 @@
>>>> > +<?xml version="1.0" encoding="UTF-8"?>
>>>> > +<!--
>>>> > + Licensed to the Apache Software Foundation (ASF) under one or more
>>>> > + contributor license agreements.  See the NOTICE file distributed with
>>>> > + this work for additional information regarding copyright ownership.
>>>> > + The ASF licenses this file to You under the Apache License, Version 2.0
>>>> > + (the "License"); you may not use this file except in compliance with
>>>> > + the License.  You may obtain a copy of the License at
>>>> > +
>>>> > +      http://www.apache.org/licenses/LICENSE-2.0 
>>>> > <http://www.apache.org/licenses/LICENSE-2.0>
>>>> > +
>>>> > + Unless required by applicable law or agreed to in writing, software
>>>> > + distributed under the License is distributed on an "AS IS" BASIS,
>>>> > + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 
>>>> > implied.
>>>> > + See the License for the specific language governing permissions and
>>>> > + limitations under the License.
>>>> > +
>>>> > +-->
>>>> > +<Configuration status="WARN" name="RoutingTest">
>>>> > +  <Appenders>
>>>> > +    <Routing name="Routing">
>>>> > +      <Routes>
>>>> > +        <Script name="RoutingInit" language="JavaScript"><![CDATA[
>>>> > +          "OSNameFoo".search("Foo") > -1 ? "Service2" : "Service1";]]>
>>>> > +        </Script>
>>>> > +        <Route key="Service1">
>>>> > +          <List name="List1" />
>>>> > +        </Route>
>>>> > +        <Route key="Service2">
>>>> > +          <List name="List2" />
>>>> > +        </Route>
>>>> > +      </Routes>
>>>> > +    </Routing>
>>>> > +  </Appenders>
>>>> > +  <Loggers>
>>>> > +    <Root level="error">
>>>> > +      <AppenderRef ref="Routing" />
>>>> > +    </Root>
>>>> > +  </Loggers>
>>>> > +</Configuration>
>>>> > \ No newline at end of file
>>>> >
>>>> > http://git-wip-us.apache.org/repos/asf/logging-log4j2/blob/e0f29d9a/src/site/xdoc/manual/appenders.xml
>>>> >  
>>>> > <http://git-wip-us.apache.org/repos/asf/logging-log4j2/blob/e0f29d9a/src/site/xdoc/manual/appenders.xml>
>>>> > ----------------------------------------------------------------------
>>>> > diff --git a/src/site/xdoc/manual/appenders.xml 
>>>> > b/src/site/xdoc/manual/appenders.xml
>>>> > index 2d3d361..a87d9b7 100644
>>>> > --- a/src/site/xdoc/manual/appenders.xml
>>>> > +++ b/src/site/xdoc/manual/appenders.xml
>>>> > @@ -3279,7 +3279,11 @@ public class JpaLogEntity extends 
>>>> > AbstractLogEventWrapperEntity {
>>>> >              Appender may be an appender previously configured and may 
>>>> > be referenced by its name or the
>>>> >              Appender can be dynamically created as needed. The 
>>>> > RoutingAppender should be configured after any
>>>> >              Appenders it references to allow it to shut down properly.
>>>> > -          </p>
>>>> > +           </p>
>>>> > +           <p>
>>>> > +             You can also configure a RoutingAppender with scripts: you 
>>>> > can run a script when the appender starts
>>>> > +             and when a route is chosen for an log event.
>>>> > +           </p>
>>>> >           <table>
>>>> >             <caption align="top">RoutingAppender Parameters</caption>
>>>> >             <tr>
>>>> > @@ -3288,7 +3292,7 @@ public class JpaLogEntity extends 
>>>> > AbstractLogEventWrapperEntity {
>>>> >               <th>Description</th>
>>>> >             </tr>
>>>> >             <tr>
>>>> > -              <td>filter</td>
>>>> > +              <td>Filter</td>
>>>> >               <td>Filter</td>
>>>> >               <td>A Filter to determine if the event should be handled 
>>>> > by this Appender. More than one Filter
>>>> >               may be used by using a CompositeFilter.</td>
>>>> > @@ -3299,16 +3303,22 @@ public class JpaLogEntity extends 
>>>> > AbstractLogEventWrapperEntity {
>>>> >               <td>The name of the Appender.</td>
>>>> >             </tr>
>>>> >             <tr>
>>>> > -              <td>rewritePolicy</td>
>>>> > +              <td>RewritePolicy</td>
>>>> >               <td>RewritePolicy</td>
>>>> >               <td>The RewritePolicy that will manipulate the 
>>>> > LogEvent.</td>
>>>> >             </tr>
>>>> >             <tr>
>>>> > -              <td>routes</td>
>>>> > +              <td>Routes</td>
>>>> >               <td>Routes</td>
>>>> >               <td>Contains one or more Route declarations to identify 
>>>> > the criteria for choosing Appenders.</td>
>>>> >             </tr>
>>>> >             <tr>
>>>> > +              <td>Script</td>
>>>> > +              <td>Script</td>
>>>> > +              <td>This Script runs when Log4j starts the 
>>>> > RoutingAppender and returns a String Route key to determine
>>>> > +                the default Route.</td>
>>>> > +            </tr>
>>>> > +            <tr>
>>>> >               <td>ignoreExceptions</td>
>>>> >               <td>boolean</td>
>>>> >               <td>The default is <code>true</code>, causing exceptions 
>>>> > encountered while appending events to be
>>>> > @@ -3319,13 +3329,20 @@ public class JpaLogEntity extends 
>>>> > AbstractLogEventWrapperEntity {
>>>> >           </table>
>>>> >           <h4>Routes</h4>
>>>> >             <p>
>>>> > -              The Routes element accepts a single, required attribute 
>>>> > named "pattern". The pattern is evaluated
>>>> > +              The Routes element accepts a single attribute named 
>>>> > "pattern". The pattern is evaluated
>>>> >               against all the registered Lookups and the result is used 
>>>> > to select a Route. Each Route may be
>>>> >               configured with a key. If the key matches the result of 
>>>> > evaluating the pattern then that Route
>>>> >               will be selected. If no key is specified on a Route then 
>>>> > that Route is the default. Only one Route
>>>> >               can be configured as the default.
>>>> >             </p>
>>>> >             <p>
>>>> > +              The Routes element may contain a Script child element. If 
>>>> > specified, the Script is run for each
>>>> > +              log event and returns the String Route key to use.
>>>> > +            </p>
>>>> > +            <p>
>>>> > +              You must specify either the pattern attribute or the 
>>>> > Script element, but not both.
>>>> > +            </p>
>>>> > +            <p>
>>>> >               Each Route must reference an Appender. If the Route 
>>>> > contains a ref attribute then the
>>>> >               Route will reference an Appender that was defined in the 
>>>> > configuration. If the Route contains an
>>>> >               Appender definition then an Appender will be created 
>>>> > within the context of the RoutingAppender and
>>>> >
>>>> >
>>>> 
>>>> 
>>>> 
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>>>> 
>>>> 
>>>> 
>>>> -- 
>>>> E-Mail: [email protected] <mailto:[email protected]> | 
>>>> [email protected]  <mailto:[email protected]>
>>>> Java Persistence with Hibernate, Second Edition 
>>>> <http://www.manning.com/bauer3/>
>>>> JUnit in Action, Second Edition <http://www.manning.com/tahchiev/>
>>>> Spring Batch in Action <http://www.manning.com/templier/>
>>>> Blog: http://garygregory.wordpress.com <http://garygregory.wordpress.com/> 
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>>> 
>>> 
>>> 
>>> -- 
>>> E-Mail: [email protected] <mailto:[email protected]> | 
>>> [email protected]  <mailto:[email protected]>
>>> Java Persistence with Hibernate, Second Edition 
>>> <http://www.manning.com/bauer3/>
>>> JUnit in Action, Second Edition <http://www.manning.com/tahchiev/>
>>> Spring Batch in Action <http://www.manning.com/templier/>
>>> Blog: http://garygregory.wordpress.com <http://garygregory.wordpress.com/> 
>>> Home: http://garygregory.com/ <http://garygregory.com/>
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>> 
>> 
>> 
>> -- 
>> E-Mail: [email protected] <mailto:[email protected]> | 
>> [email protected]  <mailto:[email protected]>
>> Java Persistence with Hibernate, Second Edition 
>> <http://www.manning.com/bauer3/>
>> JUnit in Action, Second Edition <http://www.manning.com/tahchiev/>
>> Spring Batch in Action <http://www.manning.com/templier/>
>> Blog: http://garygregory.wordpress.com <http://garygregory.wordpress.com/> 
>> Home: http://garygregory.com/ <http://garygregory.com/>
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