Allow init_delay and configurable alf_event filters. This closes #4 and closes #2

src/main/java/net/brutex/xservices/util/ALFEventFilter.java

@@ -0,0 +1,18 @@
+package net.brutex.xservices.util;
+
+import lombok.NonNull;
+import net.brutex.xservices.types.alfevent.ALFEventType;
+
+/**
+ * Provides filtering and modification of ALF Events
+ */
+public interface ALFEventFilter {
+
+    /**
+     * Modify or filter the alf event.
+     *
+     * @param event
+     * @return modified event or null if it should be filtered out
+     */
+    ALFEventType filter(@NonNull ALFEventType event);
+}

src/main/java/net/brutex/xservices/util/EventIdTruncateFilter.java

@@ -0,0 +1,23 @@
+package net.brutex.xservices.util;
+
+import lombok.NonNull;
+import net.brutex.xservices.types.alfevent.ALFEventType;
+
+/**
+ * This example filter cuts the eventid to max of 32 characters
+ */
+public class EventIdTruncateFilter implements ALFEventFilter {
+    /**
+     * Modify or filter the alf event.
+     *
+     * @param event
+     * @return modified event or null if it should be filtered out
+     */
+    @Override
+    public ALFEventType filter(@NonNull ALFEventType event) {
+    if (event.getBase().getEventId().length() > 32) {
+      event.getBase().setEventId(event.getBase().getEventId().substring(0, 32));
+        }
+        return event;
+    }
+}

src/main/java/net/brutex/xservices/util/EventmanagerConfiguration.java

@@ -13,6 +13,9 @@ import org.apache.commons.configuration2.event.EventListener;
 import org.apache.commons.configuration2.ex.ConfigurationException;
 
 import javax.servlet.ServletContext;
+import java.lang.reflect.InvocationTargetException;
+import java.util.ArrayList;
+import java.util.List;
 
 /**
  * A configuration object for the MiscService -> Eventmanager. Implemented as singleton.
@@ -43,6 +46,8 @@ public class EventmanagerConfiguration {
     private String jdbc_filedb;
     private boolean isEmitterActive = true;
     private int cleaner_interval;
+    private List<ALFEventFilter> alf_filter = new ArrayList<>();
+    private int init_delay;
 
 
     public synchronized EventmanagerConfiguration refreshConfig() {
@@ -61,6 +66,19 @@ public class EventmanagerConfiguration {
             this.jdbc_filedb = config.getString("fdb", "jdbc:h2:mem:lockdb;DB_CLOSE_DELAY=-1;");
             this.isEmitterActive = config.getBoolean("emitter_active", true);
             this.cleaner_interval = config.getInt("cleaner_interval", 5);
+            List<String> lst = config.getList(String.class,"alf_filter", new ArrayList<String>());
+
+            for ( String c :lst ) {
+                try{
+                    alf_filter.add( (ALFEventFilter) Class.forName(c).getDeclaredConstructor().newInstance());
+                } catch (ClassNotFoundException e) {
+                    log.error("Cannot find class for alf filter with name '{}'.", c);
+                } catch (InvocationTargetException | InstantiationException | IllegalAccessException |
+                         NoSuchMethodException e) {
+                    log.error("Cannot instantiate class for alf filter with name '{}'.", c);
+                }
+            }
+            this.init_delay = config.getInt("init_delay", 15);
 
 
         } catch (ConfigurationException e) {

src/main/java/net/brutex/xservices/util/MiscServiceServletContextListener.java

@@ -205,7 +205,8 @@ public class MiscServiceServletContextListener implements ServletContextListener
                 job2.getJobDataMap().put("run_key", Instant.now().toEpochMilli());
                 job2.getJobDataMap().put("egres_counter", egres);
                 job2.getJobDataMap().put(EventmanagerConfiguration.KEY, EventmanagerConfiguration.getInstance());
-                SimpleTrigger t = (SimpleTrigger) newTrigger().withIdentity("ALFEmitter").startNow().build();
+                SimpleTrigger t = (SimpleTrigger) newTrigger().withIdentity("ALFEmitter")
+                        .startAt(Date.from(Instant.now().plusSeconds(configuration.getInit_delay()))).build();
                 scheduler.scheduleJob(job2, t);
             }
         } catch (SchedulerException ex) {

src/main/java/net/brutex/xservices/ws/impl/MiscServiceImpl.java

@@ -23,10 +23,8 @@ import java.io.StringWriter;
 import java.math.BigInteger;
 import java.sql.*;
 import java.time.Instant;
+import java.util.*;
 import java.util.Date;
-import java.util.Enumeration;
-import java.util.Properties;
-import java.util.UUID;
 import java.util.concurrent.atomic.AtomicLong;
 import javax.annotation.Resource;
 import javax.jws.WebService;
@@ -43,6 +41,7 @@ import net.brutex.xservices.types.alfevent.ALFEventResponseType;
 import net.brutex.xservices.types.alfevent.ALFEventType;
 import net.brutex.xservices.types.alfevent.ObjectFactory;
 import net.brutex.xservices.types.ant.FileSetResource;
+import net.brutex.xservices.util.ALFEventFilter;
 import net.brutex.xservices.util.EventEmitter;
 import net.brutex.xservices.util.EventmanagerConfiguration;
 import net.brutex.xservices.util.RunTask;
@@ -259,6 +258,11 @@ public class MiscServiceImpl
 
     try (Connection con = pool.getConnection()) {
 
+            List<ALFEventFilter> filter = conf.getAlf_filter();
+            for(ALFEventFilter f : filter) {
+                event = f.filter(event);
+            }
+
             Marshaller m = JAXBContext.newInstance(ALFEventType.class).createMarshaller();
             //m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
             m.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE);

src/main/webapp/WEB-INF/eventmanager.properties

@@ -11,6 +11,10 @@ target.url = http://localhost:8085/eventmanager/services/ALFEventManagerDocLit
 # default: interval = 10
 interval = 30
 
+# Initial delay in seconds before sending events recovered from the file based database. This should be
+# smaller than the 'interval' setting. Default is 20 seconds.
+init_delay = 20
+
 # In-Memory Database (H2 in this case) to use for event processing
 # This is the JDBC connection string.
 # default: memdb = jdbc:h2:mem:lockdb;DB_CLOSE_DELAY=-1;
@@ -21,7 +25,6 @@ memdb = jdbc:h2:mem:lockdb;DB_CLOSE_DELAY=-1;
 # default: fdb = jdbc:h2:file:~/alf_event_db
 fdb = jdbc:h2:file:~/alf_event_db
 
-
 # Activate Emitter
 # Default is true, otherwise XServices will receive events, but not make any attempt to
 # forward them. Memory inbound queue will only be written to disk when the service is
@@ -32,3 +35,7 @@ emitter_active = true
 # storage. For trace and debugging purpose. Default value is every 5 minutes. A value of zero or smaller
 # deactivates the cleaner. Value in minutes.
 cleaner_interval = 4
+
+# ALFEventFilter classes, executed in order. This can be a comma separated list of classes
+# default: empty
+alf_filter = net.brutex.xservices.util.EventIdTruncateFilter