com.github.autermann.wps.streaming.delegate.DelegatingExecutor.java Source code

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Here is the source code for com.github.autermann.wps.streaming.delegate.DelegatingExecutor.java

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/*
 * Copyright (C) 2014 Christian Autermann
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.github.autermann.wps.streaming.delegate;

import static com.google.common.base.Preconditions.checkNotNull;

import java.io.IOException;

import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;

import org.n52.wps.server.ExceptionReport;

import com.github.autermann.wps.commons.description.ProcessDescription;
import com.github.autermann.wps.streaming.StreamingExecutor;
import com.github.autermann.wps.streaming.data.StreamingError;
import com.github.autermann.wps.streaming.data.input.ProcessInputs;
import com.github.autermann.wps.streaming.data.output.ProcessOutputs;
import com.github.autermann.wps.streaming.message.OutputMessage;
import com.github.autermann.wps.streaming.message.receiver.MessageReceiver;
import com.google.common.base.Optional;

/**
 * TODO JavaDoc
 *
 * @author Christian Autermann
 */
public class DelegatingExecutor extends StreamingExecutor {
    private final WPSClient client;
    private final ProcessDescription description;

    public DelegatingExecutor(MessageReceiver callback, DelegatingProcessConfiguration configuration) {
        super(callback, configuration);
        this.description = checkNotNull(configuration.getProcessDescription());
        this.client = new WPSClient(configuration.getRemoteURL(), createHttpClient());
    }

    private CloseableHttpClient createHttpClient() {
        PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();
        cm.setMaxTotal(100);
        return HttpClients.custom().setConnectionManager(cm).build();
    }

    @Override
    public void close() throws IOException {
        this.client.close();
    }

    @Override
    protected Optional<ProcessOutputs> execute(ProcessInputs inputs) throws StreamingError {
        try {
            return Optional.of(client.execute(description, inputs));
        } catch (StreamingError ex) {
            throw ex;
        } catch (ExceptionReport ex) {
            throw new StreamingError("Delegated process failed", StreamingError.REMOTE_COMPUTATION_ERROR, ex);
        }
    }

    @Override
    protected Optional<OutputMessage> onStop() throws StreamingError {
        return Optional.absent();
    }
}