/**
* 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
*
* 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.hadoop.gateway.svcregfunc.impl;
import org.apache.hadoop.gateway.filter.rewrite.api.UrlRewriteEnvironment;
import org.apache.hadoop.gateway.filter.rewrite.spi.UrlRewriteContext;
import org.apache.hadoop.gateway.filter.rewrite.spi.UrlRewriteFunctionProcessor;
import org.apache.hadoop.gateway.services.GatewayServices;
import org.apache.hadoop.gateway.services.hostmap.HostMapper;
import org.apache.hadoop.gateway.services.hostmap.HostMapperService;
import org.apache.hadoop.gateway.svcregfunc.api.ServiceMappedHostFunctionDescriptor;
import org.apache.hadoop.gateway.util.urltemplate.Host;
import org.apache.hadoop.gateway.util.urltemplate.Parser;
import org.apache.hadoop.gateway.util.urltemplate.Template;
import java.util.ArrayList;
import java.util.List;
public class ServiceMappedHostFunctionProcessor
extends ServiceRegistryFunctionProcessorBase<ServiceMappedHostFunctionDescriptor>
implements UrlRewriteFunctionProcessor<ServiceMappedHostFunctionDescriptor> {
private HostMapper hostmap;
@Override
public String name() {
return ServiceMappedHostFunctionDescriptor.FUNCTION_NAME;
}
@Override
public void initialize( UrlRewriteEnvironment environment, ServiceMappedHostFunctionDescriptor descriptor ) throws Exception {
super.initialize( environment, descriptor );
HostMapperService hostmapService = services().getService( GatewayServices.HOST_MAPPING_SERVICE );
if( hostmapService != null ) {
hostmap = hostmapService.getHostMapper( cluster() );
}
}
@Override
public List<String> resolve( UrlRewriteContext context, List<String> parameters ) throws Exception {
List<String> results = null;
if( parameters != null ) {
results = new ArrayList<String>( parameters.size() );
for( String parameter : parameters ) {
String url = lookupServiceUrl( parameter );
if( url != null ) {
Template template = Parser.parse( url );
Host host = template.getHost();
if( host != null ) {
String hostStr = host.getFirstValue().getPattern();
if( hostmap != null ) {
switch( context.getDirection() ) {
case IN:
parameter = hostmap.resolveInboundHostName( hostStr );
break;
case OUT:
parameter = hostmap.resolveOutboundHostName( hostStr );
break;
}
} else {
parameter = hostStr;
}
}
}
results.add( parameter );
}
}
return results;
}
}