hi,
while i was not trying to use threads, everything went fine. now i need
concurrent java threads to access the same (embedded?) graph database.
neo4j-manual.pdf for 1.4.1 says in section 1.1.2. that i should use
HighlyAvailableGraphDatabase, which is no longer there in 1.5.1 as it
seems. i have not looked into server and rest api yet, so is there a way
to do a threaded app with say a queue thread and n worker threads inside
the jvm that all do their own transactions on the same database
location? the following exception is what i got for assigning the queue
thread's embedded db to the worker threads, i guess.
Exception in thread "Thread-6" java.lang.RuntimeException:
java.nio.channels.ClosedByInterruptException
at
org.neo4j.index.impl.lucene.LuceneDataSource.getIndexWriter(LuceneDataSource.java:603)
at
org.neo4j.index.impl.lucene.LuceneDataSource.getIndexSearcher(LuceneDataSource.java:486)
at org.neo4j.index.impl.lucene.LuceneIndex.query(LuceneIndex.java:248)
at
org.neo4j.index.impl.lucene.LuceneIndex$RelationshipIndex.get(LuceneIndex.java:480)
at de.stp.DatabaseNeo4j.removeUrlQueue(DatabaseNeo4j.java:777)
at de.stp.util.BufferNeo4j.next(BufferNeo4j.java:194)
at de.stp.RoboNeo4j.nächsterSchritt(RoboNeo4j.java:452)
at de.stp.RoboNeo4j.run(RoboNeo4j.java:436)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.nio.channels.ClosedByInterruptException
at
java.nio.channels.spi.AbstractInterruptibleChannel.end(AbstractInterruptibleChannel.java:184)
at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:772)
at
org.apache.lucene.store.MMapDirectory$MMapIndexInput.<init>(MMapDirectory.java:225)
at
org.apache.lucene.store.MMapDirectory$MMapIndexInput.<init>(MMapDirectory.java:217)
at org.apache.lucene.store.MMapDirectory.openInput(MMapDirectory.java:209)
at
org.apache.lucene.index.CompoundFileReader.<init>(CompoundFileReader.java:66)
at
org.apache.lucene.index.CompoundFileReader.<init>(CompoundFileReader.java:55)
at org.apache.lucene.index.IndexWriter.getFieldInfos(IndexWriter.java:1193)
at
org.apache.lucene.index.IndexWriter.getCurrentFieldInfos(IndexWriter.java:1213)
at org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:1149)
at
org.neo4j.index.impl.lucene.LuceneDataSource.getIndexWriter(LuceneDataSource.java:590)
... 8 more
Thx for any ideas.
ciao, st.p.
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