package com.datastax.oss.driver.internal.core.session;
import com.datastax.oss.driver.api.core.session.Request;
import com.datastax.oss.driver.api.core.type.reflect.GenericType;
import com.datastax.oss.driver.shaded.guava.common.collect.ImmutableList;
import net.jcip.annotations.ThreadSafe;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@ThreadSafe
public class RequestProcessorRegistry {
private static final Logger LOG = LoggerFactory.getLogger(RequestProcessorRegistry.class);
private final String logPrefix;
private final RequestProcessor<?, ?>[] processors;
public RequestProcessorRegistry(String logPrefix, RequestProcessor<?, ?>... processors) {
this.logPrefix = logPrefix;
this.processors = processors;
}
public <RequestT extends Request, ResultT> RequestProcessor<RequestT, ResultT> processorFor(
RequestT request, GenericType<ResultT> resultType) {
for (RequestProcessor<?, ?> processor : processors) {
if (processor.canProcess(request, resultType)) {
LOG.trace("[{}] Using {} to process {}", logPrefix, processor, request);
@SuppressWarnings("unchecked")
RequestProcessor<RequestT, ResultT> result =
(RequestProcessor<RequestT, ResultT>) processor;
return result;
} else {
LOG.trace("[{}] {} cannot process {}, trying next", logPrefix, processor, request);
}
}
throw new IllegalArgumentException("No request processor found for " + request);
}
public Iterable<RequestProcessor<?, ?>> getProcessors() {
return ImmutableList.copyOf(processors);
}
}