de.ecclesia.kipeto.repository.HttpRepositoryStrategy.java Source code

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Here is the source code for de.ecclesia.kipeto.repository.HttpRepositoryStrategy.java

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/*
 * #%L
 * Kipeto Core
 * %%
 * Copyright (C) 2010 - 2011 Ecclesia Versicherungsdienst GmbH
 * %%
 * Licensed 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.
 * #L%
 */
package de.ecclesia.kipeto.repository;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.UnknownHostException;
import java.util.List;
import java.util.concurrent.TimeUnit;

import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpHead;
import org.apache.http.conn.ConnectTimeoutException;
import org.apache.http.conn.params.ConnRoutePNames;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import de.ecclesia.kipeto.exception.ConnectException;

/**
 * @author Daniel Hintze
 * @since 01.02.2010
 */
public class HttpRepositoryStrategy extends ReadingRepositoryStrategy {

    private final Logger logger = LoggerFactory.getLogger(HttpRepositoryStrategy.class);

    private final HttpClient client;
    private final String repository;

    public HttpRepositoryStrategy(String repository) {
        this.repository = repository;

        HttpParams httpParams = new BasicHttpParams();
        HttpConnectionParams.setConnectionTimeout(httpParams, (int) TimeUnit.SECONDS.toMillis(5));
        HttpConnectionParams.setSoTimeout(httpParams, (int) TimeUnit.SECONDS.toMillis(10));
        client = new DefaultHttpClient(httpParams);
    }

    public HttpRepositoryStrategy setProxy(String hostname, int port) {
        HttpHost proxy = new HttpHost(hostname, port);
        client.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);

        return this;
    }

    @Override
    public String resolveReference(String reference) throws IOException {
        StringBuilder builder = new StringBuilder();

        builder.append(repository);
        builder.append("/");
        builder.append(REFERENCE_DIR);
        builder.append("/");
        builder.append(reference);

        HttpGet httpget = new HttpGet(builder.toString());

        HttpResponse response;
        try {
            response = client.execute(httpget);
        } catch (java.net.ConnectException e) {
            throw new ConnectException(repository, builder.toString(), e);
        } catch (UnknownHostException e) {
            throw new ConnectException(repository, builder.toString(), e);
        } catch (ConnectTimeoutException e) {
            throw new ConnectException(repository, builder.toString(), e);
        }

        int statusCode = response.getStatusLine().getStatusCode();
        if (statusCode != HttpStatus.SC_OK) {
            return null;
        }

        HttpEntity entity = response.getEntity();

        BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent()));

        String id = reader.readLine();

        reader.close();

        return id;
    }

    @Override
    protected InputStream retrieve(String id) throws IOException {
        String url = buildUrlForObject(id);

        logger.debug("Retrieve Stream {} from {}", id, url);

        HttpGet httpget = new HttpGet(url);
        HttpResponse response = client.execute(httpget);
        HttpEntity entity = response.getEntity();

        int statusCode = response.getStatusLine().getStatusCode();
        if (statusCode == HttpStatus.SC_NOT_FOUND) {
            throw new IdNotFoundException(id);
        } else if (statusCode != HttpStatus.SC_OK) {
            throw new RuntimeException(response.getStatusLine().toString());
        }

        return entity.getContent();
    }

    @Override
    public long sizeInRepository(String id) throws IOException {
        HttpHead httpHead = new HttpHead(buildUrlForObject(id));
        HttpResponse response = client.execute(httpHead);

        Header contentLength = response.getFirstHeader("Content-Length");
        return Long.parseLong(contentLength.getValue());
    }

    private String buildUrlForObject(String id) {
        StringBuilder builder = new StringBuilder();

        builder.append(repository);
        builder.append("/");
        builder.append(OBJECT_DIR);
        builder.append("/");
        builder.append(id.substring(0, SUBDIR_POLICY));
        builder.append("/");
        builder.append(id.substring(SUBDIR_POLICY));

        return builder.toString();
    }

    @Override
    public boolean contains(String id) throws IOException {
        HttpHead httpHead = new HttpHead(buildUrlForObject(id));
        HttpResponse response = client.execute(httpHead);

        int statusCode = response.getStatusLine().getStatusCode();

        return statusCode == HttpStatus.SC_OK;
    }

    @Override
    public void close() {
        // gibt nichts zu schliessen
    }

    @Override
    public List<Reference> allReferences() throws IOException {
        throw new UnsupportedOperationException();
    }

    @Override
    public List<String> allObjects() {
        throw new UnsupportedOperationException();
    }

}