/**
* 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.shell;
import groovy.lang.Closure;
import org.apache.commons.lang3.StringUtils;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.message.BasicNameValuePair;
import java.io.IOException;
import java.net.URISyntaxException;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.Future;
public abstract class AbstractRequest<T> {
private Hadoop session;
protected AbstractRequest( Hadoop session ) {
this.session = session;
}
protected Hadoop hadoop() {
return session;
}
protected HttpResponse execute( HttpRequest request ) throws IOException {
return session.executeNow( request );
}
protected URIBuilder uri( String... parts ) throws URISyntaxException {
return new URIBuilder( session.base() + StringUtils.join( parts ) );
}
protected void addQueryParam( URIBuilder uri, String name, Object value ) {
if( value != null ) {
uri.addParameter( name, value.toString() );
}
}
protected void addParam( List<NameValuePair> list, String name, String value ) {
if( value != null ) {
list.add( new BasicNameValuePair( name, value ) );
}
}
abstract protected Callable<T> callable();
public T now() throws HadoopException {
try {
return callable().call();
} catch( Exception e ) {
throw new HadoopException( e );
}
}
public Future<T> later() {
return hadoop().executeLater( callable() );
}
public Future<T> later( final Closure<Void> closure ) {
return hadoop().executeLater( new Callable<T>() {
@Override
public T call() throws Exception {
T result = callable().call();
closure.call( result );
return result;
}
} );
}
}