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| <div class="subTitle">org.apache.drill.exec.compile</div> |
| <h2 title="Class ClassBuilder" class="title">Class ClassBuilder</h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.drill.exec.compile.ClassBuilder</li> |
| </ul> |
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| <pre>public class <span class="typeNameLabel">ClassBuilder</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">Implements the "plain Java" method of code generation and |
| compilation. Given a <a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html" title="class in org.apache.drill.exec.expr"><code>CodeGenerator</code></a>, obtains the generated |
| source code, compiles it with the selected compiler, loads the |
| byte-codes into a class loader and provides the resulting |
| class. Compared with the <a href="../../../../../org/apache/drill/exec/compile/ClassTransformer.html" title="class in org.apache.drill.exec.compile"><code>ClassTransformer</code></a> mechanism, |
| this one requires the code generator to have generated a complete |
| Java class that is capable of direct compilation and loading. |
| This means the generated class must be a subclass of the template |
| so that the JVM can use normal Java inheritance to associate the |
| template and generated methods. |
| <p> |
| Here is how to use the plain Java technique to debug |
| generated code: |
| <ul> |
| <li>Set the config option <tt>drill.exec.compile.code_dir</tt> |
| to the location where you want to save the generated source |
| code.</li> |
| <li>Where you generate code (using a <a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html" title="class in org.apache.drill.exec.expr"><code>CodeGenerator</code></a>), |
| set the "plain Java" options:<pre> |
| CodeGenerator<Foo> cg = ... |
| cg.plainJavaCapable(true); // Class supports plain Java |
| cg.preferPlainJava(true); // Actually generate plain Java |
| cg.saveCodeForDebugging(true); // Save code for debugging |
| ...</pre> |
| Note that <tt>saveCodeForDebugging</tt> automatically sets the PJ |
| option if the generator is capable. Call <tt>preferPlainJava</tt> |
| only if you want to try PJ for this particular generated class |
| without saving the generated code.</li> |
| <li>In your favorite IDE, add to the code lookup path the |
| code directory saved earlier. In Eclipse, for example, you do |
| this in the debug configuration you will use to debug Drill.</li> |
| <li>Set a breakpoint in template used for the generated code.</li> |
| <li>Run Drill. The IDE will stop at your breakpoint.</li> |
| <li>Step into the generated code. Examine class field and |
| local variables. Have fun!</li> |
| </ul> |
| <p> |
| Most generated classes have been upgraded to support Plain Java |
| compilation. Once this work is complete, the calls to |
| <tt>plainJavaCapable<tt> can be removed as all generated classes |
| will be capable. |
| <p> |
| The setting to prefer plain Java is ignored for any remaining generated |
| classes not marked as plain Java capable.</div> |
| </li> |
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| <h3>Field Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation"> |
| <caption><span>Fields</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/compile/ClassBuilder.html#CODE_DIR_OPTION">CODE_DIR_OPTION</a></span></code> </td> |
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| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/compile/ClassBuilder.html#ClassBuilder-org.apache.drill.common.config.DrillConfig-org.apache.drill.exec.server.options.OptionSet-">ClassBuilder</a></span>(<a href="../../../../../org/apache/drill/common/config/DrillConfig.html" title="class in org.apache.drill.common.config">DrillConfig</a> config, |
| <a href="../../../../../org/apache/drill/exec/server/options/OptionSet.html" title="interface in org.apache.drill.exec.server.options">OptionSet</a> optionManager)</code> </td> |
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| <h3>Method Summary</h3> |
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| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><?></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/compile/ClassBuilder.html#getCompiledClass-java.lang.String-java.lang.String-org.apache.drill.common.config.DrillConfig-org.apache.drill.exec.server.options.OptionSet-">getCompiledClass</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> code, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> className, |
| <a href="../../../../../org/apache/drill/common/config/DrillConfig.html" title="class in org.apache.drill.common.config">DrillConfig</a> config, |
| <a href="../../../../../org/apache/drill/exec/server/options/OptionSet.html" title="interface in org.apache.drill.exec.server.options">OptionSet</a> options)</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><?></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/compile/ClassBuilder.html#getImplementationClass-org.apache.drill.exec.expr.CodeGenerator-">getImplementationClass</a></span>(<a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html" title="class in org.apache.drill.exec.expr">CodeGenerator</a><?> cg)</code> |
| <div class="block">Given a code generator which has already generated plain Java |
| code, compile the code, create a class loader, and return the |
| resulting Java class.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
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| <h3>Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
| </ul> |
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| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
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| <!-- ============ FIELD DETAIL =========== --> |
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| <h3>Field Detail</h3> |
| <a name="CODE_DIR_OPTION"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>CODE_DIR_OPTION</h4> |
| <pre>public static final <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> CODE_DIR_OPTION</pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../constant-values.html#org.apache.drill.exec.compile.ClassBuilder.CODE_DIR_OPTION">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="constructor.detail"> |
| <!-- --> |
| </a> |
| <h3>Constructor Detail</h3> |
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| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>ClassBuilder</h4> |
| <pre>public ClassBuilder(<a href="../../../../../org/apache/drill/common/config/DrillConfig.html" title="class in org.apache.drill.common.config">DrillConfig</a> config, |
| <a href="../../../../../org/apache/drill/exec/server/options/OptionSet.html" title="interface in org.apache.drill.exec.server.options">OptionSet</a> optionManager)</pre> |
| </li> |
| </ul> |
| </li> |
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| <!-- ============ METHOD DETAIL ========== --> |
| <ul class="blockList"> |
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| <!-- --> |
| </a> |
| <h3>Method Detail</h3> |
| <a name="getImplementationClass-org.apache.drill.exec.expr.CodeGenerator-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getImplementationClass</h4> |
| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><?> getImplementationClass(<a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html" title="class in org.apache.drill.exec.expr">CodeGenerator</a><?> cg) |
| throws <a href="../../../../../org/apache/drill/exec/exception/ClassTransformationException.html" title="class in org.apache.drill.exec.exception">ClassTransformationException</a></pre> |
| <div class="block">Given a code generator which has already generated plain Java |
| code, compile the code, create a class loader, and return the |
| resulting Java class.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>cg</code> - a plain Java capable code generator that has generated |
| plain Java code</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the class that the code generator defines</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../../org/apache/drill/exec/exception/ClassTransformationException.html" title="class in org.apache.drill.exec.exception">ClassTransformationException</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getCompiledClass-java.lang.String-java.lang.String-org.apache.drill.common.config.DrillConfig-org.apache.drill.exec.server.options.OptionSet-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>getCompiledClass</h4> |
| <pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><?> getCompiledClass(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> code, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> className, |
| <a href="../../../../../org/apache/drill/common/config/DrillConfig.html" title="class in org.apache.drill.common.config">DrillConfig</a> config, |
| <a href="../../../../../org/apache/drill/exec/server/options/OptionSet.html" title="interface in org.apache.drill.exec.server.options">OptionSet</a> options) |
| throws org.codehaus.commons.compiler.CompileException, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/ClassNotFoundException.html?is-external=true" title="class or interface in java.lang">ClassNotFoundException</a>, |
| <a href="../../../../../org/apache/drill/exec/exception/ClassTransformationException.html" title="class in org.apache.drill.exec.exception">ClassTransformationException</a>, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>org.codehaus.commons.compiler.CompileException</code></dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/ClassNotFoundException.html?is-external=true" title="class or interface in java.lang">ClassNotFoundException</a></code></dd> |
| <dd><code><a href="../../../../../org/apache/drill/exec/exception/ClassTransformationException.html" title="class in org.apache.drill.exec.exception">ClassTransformationException</a></code></dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
| </dl> |
| </li> |
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