61 lines
1.5 KiB
Java
61 lines
1.5 KiB
Java
package org.gcube.common.clients.delegates;
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import org.gcube.common.clients.Call;
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import org.gcube.common.clients.config.EndpointConfig;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* A {@link ProxyDelegate} that sends {@link Call}s to service endpoints at known addresses.
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* <p>
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* This is a no-op {@link ProxyDelegate}, i.e. it executes the {@link Call} interface and converts its faults.
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* It exists to support uniform programming against the {@link ProxyDelegate} interface.
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*
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* @author Fabio Simeoni
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*
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* @param <A> the of service addresses
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* @param <S> the type of service proxies
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*
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*/
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public final class DirectDelegate<A,S> extends AbstractDelegate<A,S,EndpointConfig<A,S>> implements ProxyDelegate<S> {
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private static Logger log = LoggerFactory.getLogger(DirectDelegate.class);
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/**
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* Creates an instance with a {@link ProxyPlugin} and an endpoint address.
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* @param plugin the plugin
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* @param address the address
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*/
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public DirectDelegate(EndpointConfig<A,S> config) {
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super(config);
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}
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@Override
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public <V> V make(Call<S, V> call) throws Exception {
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ProxyPlugin<A,S,?> plugin = config().plugin();
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A address = config().address();
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log.info("calling {} @ {}",plugin.name(),address);
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S stub =null;
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try {
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stub = plugin.resolve(address,config());
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}
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catch(Exception e) {
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throw new IllegalStateException("could not resolve "+address,e);
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}
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try {
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return call.call(stub);
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}
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catch(Exception fault) {
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throw plugin.convert(fault,config());
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}
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}
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}
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