FileSystemSyncNonLock.java

/*
 * Copyright 2015 Red Hat, Inc. and/or its affiliates.
 *
 * 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.
 */

package org.uberfire.io.impl.cluster;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.RunnableFuture;

import org.uberfire.commons.cluster.ClusterService;
import org.uberfire.commons.message.MessageType;
import org.uberfire.java.nio.base.FileSystemId;
import org.uberfire.java.nio.file.FileSystem;

import static org.uberfire.io.impl.cluster.ClusterMessageType.SYNC_FS;

public class FileSystemSyncNonLock<V> {

    private final String serviceId;
    private final String scheme;
    private final String id;
    private final String uri;

    public FileSystemSyncNonLock(final String serviceId,
                                 final FileSystem _fileSystem) {
        final FileSystem fileSystem = _fileSystem.getRootDirectories().iterator().next().getFileSystem();
        this.serviceId = serviceId;
        this.scheme = fileSystem.getRootDirectories().iterator().next().toUri().getScheme();
        this.id = ((FileSystemId) fileSystem).id();
        this.uri = fileSystem.toString();
    }

    public MessageType getMessageType() {
        return SYNC_FS;
    }

    public String getServiceId() {
        return serviceId;
    }

    public Map<String, String> buildContent() {
        return new HashMap<String, String>() {{
            put("fs_scheme",
                scheme);
            put("fs_id",
                id);
            put("fs_uri",
                uri);
        }};
    }

    public void sendMessage(final ClusterService clusterService) {
        clusterService.broadcast(getServiceId(),
                                 getMessageType(),
                                 buildContent());
    }

    public V execute(final ClusterService clusterService,
                     final RunnableFuture<V> task) {
        try {
            task.run();

            final V result = task.get();

            sendMessage(clusterService);

            return result;
        } catch (final ExecutionException e) {
            throwException(e.getCause());
        } catch (final Exception e) {
            throwException(e);
        }
        return null;
    }

    private void throwException(final Throwable e) {
        if (e instanceof RuntimeException) {
            throw (RuntimeException) e;
        }
        throw new RuntimeException(e);
    }
}