forked from D-Net/dnet-hadoop
75 lines
3.2 KiB
Java
75 lines
3.2 KiB
Java
package eu.dnetlib.dhp.common;
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import java.util.Map;
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import org.apache.commons.lang.StringUtils;
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import org.apache.hadoop.conf.Configuration;
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/**
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* Utility class holding parameter names and method simplifying access to parameters from hadoop context.
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* @author mhorst
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*
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*/
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public final class WorkflowRuntimeParameters {
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public static final String OOZIE_ACTION_OUTPUT_FILENAME = "oozie.action.output.properties";
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public static final char DEFAULT_CSV_DELIMITER = ',';
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public static final String UNDEFINED_NONEMPTY_VALUE = "$UNDEFINED$";
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// default values
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public static final String DNET_SERVICE_READ_TIMEOUT_DEFAULT_VALUE = "60000";
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public static final String DNET_SERVICE_CONNECTION_TIMEOUT_DEFAULT_VALUE = "60000";
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// parameter names
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public static final String DNET_SERVICE_CLIENT_READ_TIMEOUT = "dnet.service.client.read.timeout";
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public static final String DNET_SERVICE_CLIENT_CONNECTION_TIMEOUT = "dnet.service.client.connection.timeout";
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// ----------------- CONSTRUCTORS -----------------------------
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private WorkflowRuntimeParameters() {}
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/**
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* Retrieves parameter from hadoop context configuration when set to value different than {@link WorkflowRuntimeParameters#UNDEFINED_NONEMPTY_VALUE}.
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*/
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public static String getParamValue(String paramName, Configuration configuration) {
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String paramValue = configuration.get(paramName);
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if (StringUtils.isNotBlank(paramValue) && !UNDEFINED_NONEMPTY_VALUE.equals(paramValue)) {
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return paramValue;
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} else {
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return null;
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}
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}
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/**
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* Retrieves {@link Integer} parameter from hadoop context configuration when set to non-empty value different than {@link WorkflowRuntimeParameters#UNDEFINED_NONEMPTY_VALUE}.
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* Null is returned when parameter was not set.
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* @throws {@link NumberFormatException} if parameter value does not contain a parsable integer
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*/
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public static Integer getIntegerParamValue(String paramName, Configuration configuration) throws NumberFormatException {
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String paramValue = getParamValue(paramName, configuration);
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return paramValue!=null?Integer.valueOf(paramValue):null;
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}
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/**
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* Retrieves parameter from hadoop context configuration when set to value different than {@link WorkflowRuntimeParameters#UNDEFINED_NONEMPTY_VALUE}.
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* If requested parameter was not set, fallback parameter is retrieved using the same logic.
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*/
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public static String getParamValue(String paramName, String fallbackParamName, Configuration configuration) {
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String resultCandidate = getParamValue(paramName, configuration);
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return resultCandidate!=null?resultCandidate:getParamValue(fallbackParamName, configuration);
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}
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/**
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* Provides parameter value. Returns default value when entry not found among parameters.
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*
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* @param paramName parameter name
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* @param defaultValue parameter default value to be returned when entry not found among parameters
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* @param parameters map of parameters
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*/
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public static String getParamValue(String paramName, String defaultValue, Map<String, String> parameters) {
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return parameters.containsKey(paramName)?parameters.get(paramName):defaultValue;
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}
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}
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