author | František Kučera <franta-hg@frantovo.cz> |
Fri, 13 May 2022 21:35:30 +0200 | |
branch | v_0 |
changeset 96 | c34106244a54 |
parent 75 | ecbf6504915c |
permissions | -rw-r--r-- |
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/** |
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* Relational pipes |
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* Copyright © 2020 František Kučera (Frantovo.cz, GlobalCode.info) |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, version 3 of the License. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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import java.io.ByteArrayOutputStream; |
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import java.io.IOException; |
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import java.io.PrintWriter; |
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import java.io.StringWriter; |
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import java.util.ArrayList; |
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import java.util.Arrays; |
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import java.util.LinkedList; |
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import java.util.List; |
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import java.util.Objects; |
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import java.util.regex.Matcher; |
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import java.util.regex.Pattern; |
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/** |
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* Unlike the protocol and the message format, these helper classes are not part of the public API. Thus when writing |
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* custom streamlets, it is better to copy this file and review its changes while upgrading to new upstream version. |
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*/ |
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public abstract class Streamlet { |
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// TODO: use generated constants |
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private static final int VERSION_SUPPORTED = 100; |
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private static final int WAITING_FOR_VERSION = 101; |
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private static final int VERSION_ACCEPTED = 102; |
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private static final int RELATION_START = 103; |
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private static final int INPUT_ATTRIBUTE_METADATA = 104; |
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private static final int OUTPUT_ATTRIBUTE_ALIAS = 105; |
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private static final int OPTION = 106; |
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private static final int COMPLETION_REQUEST = 107; |
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private static final int COMPLETION = 108; |
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private static final int COMPLETION_END = 109; |
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private static final int WAITING_FOR_OUTPUT_ATTRIBUTES_METADATA = 110; |
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private static final int OUTPUT_ATTRIBUTE_METADATA = 111; |
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private static final int WAITING_FOR_INPUT_ATTRIBUTES = 112; |
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private static final int INPUT_ATTRIBUTE = 113; |
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private static final int WAITING_FOR_OUTPUT_ATTRIBUTES = 114; |
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private static final int OUTPUT_ATTRIBUTE = 115; |
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private static final int EXECUTOR_ERROR = 116; |
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private static final int STREAMLET_ERROR = 117; |
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private static final int STREAMLET_WARNING = 118; |
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private static final int RELATION_END = 120; |
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protected static class Message { |
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public int code; |
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public List<String> parameters; |
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public Message() { |
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} |
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public Message(int code, String... parameters) { |
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this.code = code; |
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this.parameters = Arrays.asList(parameters); |
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} |
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} |
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private static final char SEPARATOR = '\0'; |
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private int readInt() throws IOException { |
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return Integer.valueOf(readString()); |
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} |
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private String readString() throws IOException { |
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ByteArrayOutputStream buffer = new ByteArrayOutputStream(); |
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for (int b; (b = System.in.read()) > 0;) { |
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buffer.write(b); |
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} |
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return new String(buffer.toByteArray()); |
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} |
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private void writeString(String s) { |
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System.out.print(s); |
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System.out.print(SEPARATOR); |
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} |
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private void writeInt(int i) { |
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writeString(String.valueOf(i)); |
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} |
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private void flush() { |
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System.out.flush(); |
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} |
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private Message read() throws IOException { |
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Message m = new Message(); |
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m.code = readInt(); |
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int count = readInt(); |
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m.parameters = new ArrayList<>(count); |
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|
105 |
for (int i = 0; i < count; i++) { |
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|
106 |
m.parameters.add(readString()); |
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107 |
} |
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|
108 |
return m; |
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|
109 |
} |
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|
110 |
|
72
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|
111 |
private void copyMatches(Matcher source, List<String> destination) { |
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|
112 |
for (int i = 1; i < source.groupCount(); i++) { |
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|
113 |
destination.add(source.group(i)); |
63
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|
114 |
} |
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115 |
} |
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|
116 |
|
72
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|
117 |
private void processMessages() throws IOException { |
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|
118 |
OUTER: |
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119 |
while (true) { |
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120 |
Message m = read(); |
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121 |
switch (m.code) { |
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122 |
case VERSION_SUPPORTED: |
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123 |
processVersionSupported(m); |
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124 |
break; |
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125 |
case WAITING_FOR_VERSION: |
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126 |
processWaitingForVersion(m); |
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127 |
break; |
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128 |
case RELATION_START: |
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129 |
processRelationStart(m); |
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130 |
break; |
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|
131 |
case INPUT_ATTRIBUTE_METADATA: |
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132 |
processInputAttributeMetadata(m); |
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133 |
break; |
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|
134 |
case OUTPUT_ATTRIBUTE_ALIAS: |
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135 |
processOutputAttributeAlias(m); |
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136 |
break; |
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|
137 |
case OPTION: |
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|
138 |
processOption(m); |
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139 |
break; |
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140 |
case INPUT_ATTRIBUTE: |
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141 |
processInputAttribute(m); |
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142 |
break; |
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|
143 |
case WAITING_FOR_OUTPUT_ATTRIBUTES_METADATA: |
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|
144 |
processWaitingForOutputAttributesMetadata(m); |
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|
145 |
break; |
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|
146 |
case WAITING_FOR_OUTPUT_ATTRIBUTES: |
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|
147 |
processWaitingForOutputAttributes(m); |
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|
148 |
break; |
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|
149 |
case RELATION_END: |
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150 |
break OUTER; |
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|
151 |
default: |
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152 |
processUnsupportedMessage(m); |
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|
153 |
break; |
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|
154 |
} |
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|
155 |
} |
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|
156 |
} |
63
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|
157 |
|
72
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|
158 |
protected static class AttributeMetadata { |
63
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|
159 |
|
72
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|
160 |
public String name; |
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|
161 |
public Type type; |
67
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streamlet examples: xpath
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|
162 |
|
72
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|
163 |
public AttributeMetadata(String name, Type type) { |
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|
164 |
this.name = name; |
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|
165 |
this.type = type; |
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|
166 |
} |
63
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|
167 |
}; |
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|
168 |
|
72
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|
169 |
protected static class Option { |
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|
170 |
|
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|
171 |
public String name; |
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|
172 |
public String value; |
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|
173 |
public List<String> nameMatch; |
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|
174 |
public List<String> valueMatch; |
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|
175 |
|
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|
176 |
Option(String name, String value) { |
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|
177 |
this.name = name; |
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|
178 |
this.value = value; |
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|
179 |
} |
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|
180 |
} |
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|
181 |
|
75
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|
182 |
private List<String> versionsSupported = new LinkedList<>(); |
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|
183 |
private List<AttributeMetadata> inputAttributes = new ArrayList<>(); |
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|
184 |
private List<String> outputAttributeAliases = new ArrayList<>(); |
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|
185 |
private List<Option> options = new LinkedList<>(); |
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|
186 |
private String currentRelation; |
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|
187 |
private String currentFile; |
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|
188 |
|
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|
189 |
/** |
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|
190 |
* @return n.b. generic streamlet (later in relpipe-tr-streamler) will not have currentFile |
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|
191 |
*/ |
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|
192 |
public String getCurrentFile() { |
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streamlet examples: encapsulate and hide abstract class fields
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|
193 |
return currentFile; |
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|
194 |
} |
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|
195 |
|
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|
196 |
public String getCurrentRelation() { |
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|
197 |
return currentRelation; |
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|
198 |
} |
63
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|
199 |
|
72
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|
200 |
protected static enum Type { |
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|
201 |
BOOLEAN, |
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|
202 |
INTEGER, |
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|
203 |
STRING |
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|
204 |
} |
63
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|
205 |
|
72
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|
206 |
protected void write(Message m) { |
63
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|
207 |
writeInt(m.code); |
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|
208 |
writeInt(m.parameters.size()); |
72
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|
209 |
for (String p : m.parameters) { |
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|
210 |
writeString(p); |
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|
211 |
} |
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|
212 |
flush(); |
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|
213 |
} |
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protected void processVersionSupported(Message m) { |
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versionsSupported.add(m.parameters.get(0)); |
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} |
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protected void processWaitingForVersion(Message m) { |
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for (String v : versionsSupported) { |
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if ("1".equals(v)) { |
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write(new Message(VERSION_ACCEPTED, "1")); |
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return; |
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} |
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} |
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write(new Message(STREAMLET_ERROR, "INCOMPATIBLE_VERSION", "Only version 1 is supported by this streamlet.")); |
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} |
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protected void processRelationStart(Message m) { |
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currentRelation = m.parameters.get(0); |
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} |
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protected void processInputAttributeMetadata(Message m) { |
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inputAttributes.add(new AttributeMetadata(m.parameters.get(0), Type.valueOf(m.parameters.get(1).toUpperCase()))); |
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} |
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protected void processOutputAttributeAlias(Message m) { |
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outputAttributeAliases.add(m.parameters.get(0)); |
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} |
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protected void processOption(Message m) { |
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options.add(new Option(m.parameters.get(0), m.parameters.get(1))); |
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} |
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protected void processInputAttribute(Message m) { |
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int index = Integer.valueOf(m.parameters.get(0)); |
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String value = m.parameters.get(1); |
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boolean isNull = "true".equals(m.parameters.get(2)); |
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if ("path".equals(inputAttributes.get(index).name)) { |
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currentFile = value; |
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} |
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} |
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protected void processWaitingForOutputAttributesMetadata(Message m) { |
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for (AttributeMetadata am : getOutputAttributesMetadata()) { |
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write(new Message(OUTPUT_ATTRIBUTE_METADATA, am.name, am.type.name().toLowerCase())); |
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} |
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write(new Message(WAITING_FOR_INPUT_ATTRIBUTES)); |
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} |
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protected void processWaitingForOutputAttributes(Message m) { |
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for (Object oa : getOutputAttributes()) { |
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write(new Message(OUTPUT_ATTRIBUTE, String.valueOf(oa), oa == null ? "true" : "false")); |
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} |
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write(new Message(WAITING_FOR_INPUT_ATTRIBUTES)); |
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} |
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protected void processUnsupportedMessage(Message m) { |
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write(new Message(STREAMLET_ERROR, "UNSUPPORTED_MESSAGE")); |
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} |
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protected String getAlias(int index, String defaultValue) { |
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if (outputAttributeAliases.size() > index) { |
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return outputAttributeAliases.get(index); |
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} else { |
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return defaultValue; |
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} |
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} |
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|
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protected List<Option> getOptions(String name) { |
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List<Option> result = new ArrayList<>(); |
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for (Option o : options) { |
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if (Objects.equals(o.name, name)) { |
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result.add(o); |
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} |
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} |
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return result; |
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} |
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|
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protected List<Option> getOptions(Pattern namePattern) { |
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List<Option> result = new ArrayList<>(); |
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for (Option o : options) { |
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Matcher nameMatcher = namePattern.matcher(o.name); |
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if (nameMatcher.matches()) { |
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o.nameMatch = o.nameMatch == null ? new ArrayList<>() : o.nameMatch; |
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copyMatches(nameMatcher, o.nameMatch); |
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result.add(o); |
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} |
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} |
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return result; |
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} |
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|
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303 |
protected List<Option> getOptions(Pattern namePattern, Pattern valuePattern) { |
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// TODO: support multiple modes: |
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// a) throw an exception if valuePattern does not match |
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// b) return option even if valuePattern does not match (valueMatch will be empty) |
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// c) skip options with value not matching (current behavior) |
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List<Option> result = new ArrayList<>(); |
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for (Option o : options) { |
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Matcher nameMatcher = namePattern.matcher(o.name); |
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Matcher valueMatcher = valuePattern.matcher(o.value); |
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if (nameMatcher.matches() && valueMatcher.matches()) { |
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o.nameMatch = o.nameMatch == null ? new ArrayList<>() : o.nameMatch; |
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o.valueMatch = o.valueMatch == null ? new ArrayList<>() : o.valueMatch; |
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copyMatches(nameMatcher, o.nameMatch); |
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copyMatches(valueMatcher, o.valueMatch); |
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result.add(o); |
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} |
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} |
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return result; |
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} |
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|
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protected abstract List<AttributeMetadata> getOutputAttributesMetadata(); |
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|
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protected abstract List<Object> getOutputAttributes(); |
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|
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public int run() { |
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try { |
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processMessages(); |
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return 0; |
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} catch (Exception e) { |
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StringWriter stackTraceStringWriter = new StringWriter(); |
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PrintWriter stackTracePrintWriter = new PrintWriter(stackTraceStringWriter); |
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e.printStackTrace(stackTracePrintWriter); |
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write(new Message(STREAMLET_ERROR, "xxxx", "Exception in streamlet: " + e.getClass().getName() + ": " + e.getLocalizedMessage() + "\n" + stackTraceStringWriter.toString())); // FIXME: correct error codes |
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return 1; |
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} |
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} |
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} |