org.apache.fluo.core.observer.v2.ObserversV2.java Source code

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Here is the source code for org.apache.fluo.core.observer.v2.ObserversV2.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.fluo.core.observer.v2;

import java.util.Map;
import java.util.Set;

import com.google.common.collect.Sets;
import com.google.common.collect.Sets.SetView;
import org.apache.fluo.api.data.Column;
import org.apache.fluo.api.exceptions.FluoException;
import org.apache.fluo.api.observer.Observer;
import org.apache.fluo.api.observer.ObserverProvider;
import org.apache.fluo.core.impl.Environment;
import org.apache.fluo.core.observer.Observers;
import org.apache.fluo.core.util.Hex;

class ObserversV2 implements Observers {

    Map<Column, Observer> observers;
    Map<Column, String> aliases;

    public ObserversV2(Environment env, JsonObservers jco, Set<Column> strongColumns, Set<Column> weakColumns) {

        ObserverProvider obsProvider = ObserverStoreV2.newObserverProvider(jco.getObserverProviderClass());

        ObserverProviderContextImpl ctx = new ObserverProviderContextImpl(env);

        ObserverRegistry or = new ObserverRegistry(strongColumns, weakColumns);
        obsProvider.provide(or, ctx);

        this.observers = or.observers;
        this.aliases = or.aliases;
        this.observers.forEach((k, v) -> aliases.computeIfAbsent(k, col -> Hex.encNonAscii(col, ":")));

        // the following check ensures observers are provided for all previously configured columns
        SetView<Column> diff = Sets.difference(observers.keySet(), Sets.union(strongColumns, weakColumns));
        if (diff.size() > 0) {
            throw new FluoException("ObserverProvider " + jco.getObserverProviderClass()
                    + " did not provide observers for columns " + diff);
        }
    }

    @Override
    public Observer getObserver(Column col) {
        return observers.get(col);
    }

    @Override
    public void returnObserver(Observer o) {
    }

    @Override
    public void close() {
    }

    @Override
    public String getObserverId(Column col) {
        return aliases.get(col);
    }
}