Package io.crate.metadata.blob

Source Code of io.crate.metadata.blob.BlobSchemaInfo

/*
* Licensed to CRATE Technology GmbH ("Crate") under one or more contributor
* license agreements.  See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.  Crate 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.
*
* However, if you have executed another commercial license agreement
* with Crate these terms will supersede the license and you may use the
* software solely pursuant to the terms of the relevant commercial agreement.
*/

package io.crate.metadata.blob;

import com.google.common.base.Function;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.common.collect.FluentIterable;
import io.crate.blob.BlobEnvironment;
import io.crate.blob.v2.BlobIndices;
import io.crate.exceptions.UnhandledServerException;
import io.crate.metadata.TableIdent;
import io.crate.metadata.table.SchemaInfo;
import io.crate.metadata.table.TableInfo;
import org.elasticsearch.cluster.ClusterChangedEvent;
import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.cluster.ClusterStateListener;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.env.Environment;

import javax.annotation.Nullable;
import java.util.Arrays;
import java.util.Iterator;
import java.util.concurrent.ExecutionException;

public class BlobSchemaInfo implements SchemaInfo, ClusterStateListener {

    public static final String NAME = "blob";

    private final ClusterService clusterService;
    private final BlobEnvironment blobEnvironment;
    private final Environment environment;

    private final LoadingCache<String, BlobTableInfo> cache = CacheBuilder.newBuilder()
            .maximumSize(10000)
            .build(
                    new CacheLoader<String, BlobTableInfo>() {
                        @Override
                        public BlobTableInfo load(String key) throws Exception {
                            return innerGetTableInfo(key);
                        }
                    }
            );

    private final Function<String, TableInfo> tableInfoFunction;

    @Inject
    public BlobSchemaInfo(ClusterService clusterService,
                          BlobEnvironment blobEnvironment,
                          Environment environment) {
        this.clusterService = clusterService;
        this.blobEnvironment = blobEnvironment;
        this.environment = environment;
        clusterService.add(this);
        tableInfoFunction = new Function<String, TableInfo>() {
            @Nullable
            @Override
            public TableInfo apply(@Nullable String input) {
                return getTableInfo(input);
            }
        };
    }

    private BlobTableInfo innerGetTableInfo(String name) {
        BlobTableInfoBuilder builder = new BlobTableInfoBuilder(this,
                new TableIdent(NAME, name), clusterService, blobEnvironment, environment);
        return builder.build();
    }

    @Override
    public BlobTableInfo getTableInfo(String name) {
        try {
            return cache.get(name);
        } catch (ExecutionException e) {
            throw new UnhandledServerException("Failed to get TableInfo", e.getCause());
        }
    }

    @Override
    public String name() {
        return NAME;
    }

    @Override
    public boolean systemSchema() {
        return true;
    }

    @Override
    public void clusterChanged(ClusterChangedEvent event) {
        if (event.metaDataChanged()) {
            cache.invalidateAll();
        }
    }

    @Override
    public Iterator<TableInfo> iterator() {
        return tableNamesIterable().transform(tableInfoFunction).iterator();
    }

    private FluentIterable<String> tableNamesIterable() {
        // TODO: once we support closing/opening tables change this to concreteIndices()
        // and add  state info to the TableInfo.
        return FluentIterable
                .from(Arrays.asList(clusterService.state().metaData().concreteAllOpenIndices()))
                .filter(BlobIndices.indicesFilter)
                .transform(BlobIndices.stripPrefix);
    }
}
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