1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.application.container;
import com.yahoo.api.annotations.Beta;
import com.yahoo.component.ComponentSpecification;
import com.yahoo.component.chain.Chain;
import com.yahoo.processing.Processor;
import com.yahoo.processing.Request;
import com.yahoo.processing.Response;
import com.yahoo.processing.execution.chain.ChainRegistry;
import com.yahoo.processing.rendering.Renderer;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
/**
* @author gjoranv
*/
@Beta
public abstract class ProcessingBase<REQUEST extends Request, RESPONSE extends Response, PROCESSOR extends Processor> {
/** Returns a registry of configured chains */
public abstract ChainRegistry<PROCESSOR> getChains();
/**
* Processes the given request with the given chain, and returns the response.
*
* @param chain the specification of the chain to execute
* @param request the request to process
* @return a response
*/
public final RESPONSE process(ComponentSpecification chain, REQUEST request) {
Chain<PROCESSOR> processingChain = getChain(chain);
return doProcess(processingChain, request);
}
protected abstract RESPONSE doProcess(Chain<PROCESSOR> chain, REQUEST request);
public final byte[] processAndRender(ComponentSpecification chainSpec,
ComponentSpecification rendererSpec,
REQUEST request) throws IOException {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
Renderer<RESPONSE> renderer = getRenderer(rendererSpec);
CompletableFuture<Boolean> renderTask = doProcessAndRender(chainSpec, request, renderer, stream);
awaitFuture(renderTask);
return stream.toByteArray();
}
private void awaitFuture(CompletableFuture<Boolean> renderTask) {
try {
renderTask.get();
} catch (InterruptedException | ExecutionException e) {
throw new ApplicationException(e);
}
}
protected abstract CompletableFuture<Boolean> doProcessAndRender(ComponentSpecification chainSpec,
REQUEST request,
Renderer<RESPONSE> renderer,
ByteArrayOutputStream stream) throws IOException ;
protected Chain<PROCESSOR> getChain(ComponentSpecification chainSpec) {
Chain<PROCESSOR> chain = getChains().getComponent(chainSpec);
if (chain == null) {
throw new IllegalArgumentException("No such chain: " + chainSpec);
}
return chain;
}
protected final Renderer<RESPONSE> getRenderer(ComponentSpecification spec) {
return doGetRenderer(spec);
}
// TODO: This would not be necessary if Search/ProcHandler implemented a common interface
protected abstract Renderer<RESPONSE> doGetRenderer(ComponentSpecification spec);
}
|
