org.apache.lucene.replicator.http.HttpReplicator.java Source code

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Here is the source code for org.apache.lucene.replicator.http.HttpReplicator.java

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/*
 * 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.lucene.replicator.http;

import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.concurrent.Callable;

import org.apache.http.HttpResponse;
import org.apache.http.conn.HttpClientConnectionManager;
import org.apache.lucene.replicator.Replicator;
import org.apache.lucene.replicator.Revision;
import org.apache.lucene.replicator.SessionToken;
import org.apache.lucene.replicator.http.ReplicationService.ReplicationAction;

/**
 * An HTTP implementation of {@link Replicator}. Assumes the API supported by
 * {@link ReplicationService}.
 * 
 * @lucene.experimental
 */
public class HttpReplicator extends HttpClientBase implements Replicator {

    /** Construct with specified connection manager. */
    public HttpReplicator(String host, int port, String path, HttpClientConnectionManager conMgr) {
        super(host, port, path, conMgr, null);
    }

    @Override
    public SessionToken checkForUpdate(String currVersion) throws IOException {
        String[] params = null;
        if (currVersion != null) {
            params = new String[] { ReplicationService.REPLICATE_VERSION_PARAM, currVersion };
        }
        final HttpResponse response = executeGET(ReplicationAction.UPDATE.name(), params);
        return doAction(response, new Callable<SessionToken>() {
            @Override
            public SessionToken call() throws Exception {
                final DataInputStream dis = new DataInputStream(responseInputStream(response));
                try {
                    if (dis.readByte() == 0) {
                        return null;
                    } else {
                        return new SessionToken(dis);
                    }
                } finally {
                    dis.close();
                }
            }
        });
    }

    @Override
    public InputStream obtainFile(String sessionID, String source, String fileName) throws IOException {
        String[] params = new String[] { ReplicationService.REPLICATE_SESSION_ID_PARAM, sessionID,
                ReplicationService.REPLICATE_SOURCE_PARAM, source, ReplicationService.REPLICATE_FILENAME_PARAM,
                fileName, };
        final HttpResponse response = executeGET(ReplicationAction.OBTAIN.name(), params);
        return doAction(response, false, new Callable<InputStream>() {
            @Override
            public InputStream call() throws Exception {
                return responseInputStream(response, true);
            }
        });
    }

    @Override
    public void publish(Revision revision) throws IOException {
        throw new UnsupportedOperationException(
                "this replicator implementation does not support remote publishing of revisions");
    }

    @Override
    public void release(String sessionID) throws IOException {
        String[] params = new String[] { ReplicationService.REPLICATE_SESSION_ID_PARAM, sessionID };
        final HttpResponse response = executeGET(ReplicationAction.RELEASE.name(), params);
        doAction(response, new Callable<Object>() {
            @Override
            public Object call() throws Exception {
                return null; // do not remove this call: as it is still validating for us!
            }
        });
    }

}