Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
XmlRpcWorkerFactory |
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1 | /* |
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2 | * Copyright 1999,2005 The Apache Software Foundation. |
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3 | * |
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4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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5 | * you may not use this file except in compliance with the License. |
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6 | * You may obtain a copy of the License at |
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7 | * |
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8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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9 | * |
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10 | * Unless required by applicable law or agreed to in writing, software |
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11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | * See the License for the specific language governing permissions and |
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14 | * limitations under the License. |
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15 | */ |
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16 | package org.apache.xmlrpc.common; |
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17 | ||
18 | import java.util.ArrayList; |
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19 | import java.util.List; |
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20 | ||
21 | import org.apache.xmlrpc.XmlRpcLoadException; |
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22 | import org.apache.xmlrpc.client.XmlRpcClientWorker; |
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23 | ||
24 | ||
25 | /** A factory for {@link org.apache.xmlrpc.client.XmlRpcClientWorker} |
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26 | * instances. |
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27 | */ |
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28 | public abstract class XmlRpcWorkerFactory { |
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29 | 518 | private final XmlRpcWorker singleton = newWorker(); |
30 | private final XmlRpcController controller; |
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31 | 518 | private final List pool = new ArrayList(); |
32 | private int numThreads; |
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33 | ||
34 | /** Creates a new instance. |
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35 | * @param pController The client controlling the factory. |
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36 | */ |
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37 | 518 | public XmlRpcWorkerFactory(XmlRpcController pController) { |
38 | 518 | controller = pController; |
39 | 518 | } |
40 | ||
41 | /** Creates a new worker instance. |
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42 | * @return New instance of {@link XmlRpcClientWorker}. |
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43 | */ |
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44 | protected abstract XmlRpcWorker newWorker(); |
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45 | ||
46 | /** Returns the factory controller. |
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47 | * @return The controller, an instance of |
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48 | * {@link org.apache.xmlrpc.client.XmlRpcClient}, or |
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49 | * {@link org.apache.xmlrpc.server.XmlRpcServer}. |
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50 | */ |
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51 | public XmlRpcController getController() { |
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52 | 747 | return controller; |
53 | } |
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54 | ||
55 | /** Returns a worker for synchronous processing. |
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56 | * @return An instance of {@link XmlRpcClientWorker}, which is ready |
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57 | * for use. |
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58 | * @throws XmlRpcLoadException The clients maximum number of concurrent |
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59 | * threads is exceeded. |
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60 | */ |
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61 | public synchronized XmlRpcWorker getWorker() throws XmlRpcLoadException { |
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62 | 747 | int max = controller.getMaxThreads(); |
63 | 747 | if (max > 0 && numThreads == max) { |
64 | 0 | throw new XmlRpcLoadException("Maximum number of concurrent requests exceeded: " + max); |
65 | } |
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66 | 747 | ++numThreads; |
67 | 747 | if (max == 0) { |
68 | 747 | return singleton; |
69 | } |
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70 | 0 | if (pool.size() == 0) { |
71 | 0 | return newWorker(); |
72 | } else { |
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73 | 0 | return (XmlRpcClientWorker) pool.remove(pool.size() - 1); |
74 | } |
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75 | } |
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76 | ||
77 | /** Called, when the worker did its job. Frees resources and |
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78 | * decrements the number of concurrent requests. |
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79 | * @param pWorker The worker being released. |
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80 | */ |
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81 | public synchronized void releaseWorker(XmlRpcClientWorker pWorker) { |
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82 | 432 | --numThreads; |
83 | 432 | int max = controller.getMaxThreads(); |
84 | 432 | if (pWorker == singleton) { |
85 | // Do nothing, it's the singleton |
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86 | } else { |
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87 | 0 | if (pool.size() < max) { |
88 | 0 | pool.add(pWorker); |
89 | } |
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90 | } |
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91 | 432 | } |
92 | ||
93 | /** Returns the number of currently running requests. |
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94 | * @return Current number of concurrent requests. |
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95 | */ |
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96 | public synchronized int getCurrentRequests() { |
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97 | 0 | return numThreads; |
98 | } |
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99 | } |