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This article shows you what the role of WrapperAdapter in sharding-jdbc is, the content is concise and easy to understand, it can definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

Wrapper

Jdktel 12.jdkqqqql ContentsUniverse HomeUnixlibUnixsrc.zipAccording java.sqlUniverse java.sqlUniq.java

Public interface Wrapper {T unwrap (java.lang.Class iface) throws java.sql.SQLException; boolean isWrapperFor (java.lang.Class iface) throws java.sql.SQLException;}

The Wrapper interface defines unwrap and isWrapperFor methods.

WrapperAdapter

Incubator-shardingsphere-4.0.0-RC1/sharding-jdbc/sharding-jdbc-core/src/main/java/org/apache/shardingsphere/shardingjdbc/jdbc/adapter/WrapperAdapter.java

Public abstract class WrapperAdapter implements Wrapper {private final Collection jdbcMethodInvocations = new ArrayList (); @ SuppressWarnings ("unchecked") @ Override public final T unwrap (final Class iface) throws SQLException {if (isWrapperFor (iface)) {return (T) this;} throw new SQLException (String.format ("[% s] cannot be unwrapped as [% s]", getClass () .getName (), iface.getName () } @ Override public final boolean isWrapperFor (final Class iface) {return iface.isInstance (this);} / * * record method invocation. * * @ param targetClass target class * @ param methodName method name * @ param argumentTypes argument types * @ param arguments arguments * / @ SneakyThrows public final void recordMethodInvocation (final Class targetClass, final String methodName, final Class [] argumentTypes, final Object [] arguments) {jdbcMethodInvocations.add (targetClass.getMethod (methodName, argumentTypes), arguments);} / * * Replay methods invocation. * * @ param target target object * / public final void replayMethodsInvocation (final Object target) {for (JdbcMethodInvocation each: jdbcMethodInvocations) {each.invoke (target);}

The WrapperAdapter declaration implements the java.sql.Wrapper interface, which defines the JdbcMethodInvocation collection; the recordMethodInvocation method adds the JdbcMethodInvocation;replayMethodsInvocation method to the jdbcMethodInvocations and executes the invoke method of JdbcMethodInvocation one by one

JdbcMethodInvocation

Incubator-shardingsphere-4.0.0-RC1/sharding-jdbc/sharding-jdbc-core/src/main/java/org/apache/shardingsphere/shardingjdbc/jdbc/adapter/invocation/JdbcMethodInvocation.java

@ RequiredArgsConstructorpublic class JdbcMethodInvocation {@ Getter private final Method method; @ Getter private final Object [] arguments; / * * Invoke JDBC method. * * @ param target target object * / @ SneakyThrows public void invoke (final Object target) {method.invoke (target, arguments);}}

The invoke method of JdbcMethodInvocation executes method.invoke

Summary

The WrapperAdapter declaration implements the java.sql.Wrapper interface, which defines the JdbcMethodInvocation collection; the recordMethodInvocation method adds the JdbcMethodInvocation;replayMethodsInvocation method to the jdbcMethodInvocations and executes the invoke method of JdbcMethodInvocation one by one

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