org.epics.pvmanager.ReadRecipeBuilder Maven / Gradle / Ivy
/**
* Copyright (C) 2010-14 pvmanager developers. See COPYRIGHT.TXT
* All rights reserved. Use is subject to license terms. See LICENSE.TXT
*/
package org.epics.pvmanager;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
/**
* Builder class for {@link ReadRecipe}.
*
* @author carcassi
*/
public class ReadRecipeBuilder {
private final Map>> channelCaches
= new HashMap<>();
/**
* Adds a channel and its read cache to the recipe.
*
* @param channelName the name of the channel
* @param cache the cache that contains the value
* @return this builder
*/
public ReadRecipeBuilder addChannel(String channelName, ValueCache cache) {
Collection> cachesForChannel = channelCaches.get(channelName);
if (cachesForChannel == null) {
cachesForChannel = new HashSet<>();
channelCaches.put(channelName, cachesForChannel);
}
cachesForChannel.add(cache);
return this;
}
/**
* Builds the recipe.
*
* To finish building the recipe, one needs to specify where to send errors
* and where to send the connection status changes.
*
* @param exceptionWriteFunction where exception should be routed
* @param connectionCollector where connection status should be routed
* @return a new recipe
*/
public ReadRecipe build(WriteFunction exceptionWriteFunction, ConnectionCollector connectionCollector) {
Set recipes = new HashSet<>();
for (Map.Entry>> entry : channelCaches.entrySet()) {
String channelName = entry.getKey();
Collection> valueCaches = entry.getValue();
for (ValueCache valueCache : valueCaches) {
recipes.add(new ChannelReadRecipe(channelName,
new ChannelHandlerReadSubscription(valueCache, exceptionWriteFunction, connectionCollector.addChannel(channelName))));
}
}
return new ReadRecipe(recipes);
}
}